Re: [pinhole-discussion] slit cameras?
Hi Tom, Thanks for the info. I agree that banding looks ok on some images and out of place in others. Just depends on the image. Regards, Brigitte. Tom Miller twmil...@mr.net To: pinhole-discussion@p at ??? Sent by: cc: pinhole-discussion-admin@pSubject: Re: [pinhole-discussion] slit cameras? inhole.com 08/11/2001 17:05 Please respond to pinhole-discussion Hi Brigitte, Further in Jim Moninger's article he mentioned that he saw the banding using .5mm slits and so increased the slit width to 2mm thus making more diffuse images with less banding. I can't see banding in the images that accompany his article. The use or elimination of banding is up to the photographer. Marnie Cardozo's images in the same issue of PJ are much sharper, but include banding. I've dedided to keep the banding in the iconoclast images. Tom - Original Message - From: brigitte.har...@london.glencore.com To: pinhole-discussion@p at ??? Sent: Wednesday, November 07, 2001 7:44 AM Subject: Re: [pinhole-discussion] slit cameras? Thanks guys. But what does it mean in pratical terms of constructing or pairing differently shaped slits. Is there anything I can do or avoid to do in order to eliminate or diffuse the problem? Regards, Brigitte. Guillermo pen...@home.com To: pinhole-discussion@p at ??? Sent by: cc: pinhole-discussion-admin@pSubject: Re: [pinhole-discussion] slit cameras? inhole.com 07/11/2001 13:08 Please respond to pinhole-discussion - Original Message - From: Tom Miller twmil...@mr.net Also, do you have any explanation why in some slit configurations there is a lot of banding (thin black lines) forming over the image? This quote is from Jim Moninger's article in the Pinhole Journal vol. 15 #1 : These are apparently caused by the light rays / waves with form the two separate images becoming out of phase with one another. Tom Not just out of phase but 180 degrees from each other. This -perhaps- are regions where light (wave) diffracted by one slit is at its maximum peak (+) and light (wave) diffracted by the other slit not just overlaps the former but happens to be at its lowest peak (-), the net effect is darkness, light from one slit canceling out with light from the other slit, weird, eh? This BTW, is called Destructive Interference. Guillermo ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ STRICTLY CONFIDENTIAL. The contents of this email and any attachments are strictly confidential and they may not be used or disclosed by someone who is not a named recipient. If you have received this email in error please notify the sender by replying to this email inserting the word misdirected as the message. ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] slit cameras?
Hi Guillermo, I crudely measured several of the dozen or so slits that I use. They range from about .5mm to .75mm; most are about .65mm. I wasn't sure how to plug the numbers into the the following formula, since the slits are different lengths from the film plane. Most always the inner slit is 3 or about 75mm from the film plane and the outer slit is 6 or about 150mm. There is only one focal length variable in the formula. Using .65 for both A and B: at 150mm focal length, the result was f 204; at 75mm it was f 102. My guess is that neither is quite right. Tom - Original Message - From: Guillermo pen...@home.com To: pinhole-discussion@p at ??? Sent: Wednesday, November 07, 2001 9:32 AM Subject: Re: [pinhole-discussion] slit cameras? - Original Message - From: Tom Miller twmil...@mr.net The format for the two images is 4x5. The rule of thumb I heard was to meter the scene at f90 and give it two more stops. This means your slits set up is f/180 This gives exposures of 1 or 2 seconds in bright sun with Ektachrome 64T (EPY). The few pinhole exposures I've made with 4x5 EPY were in the 16 second range. Naturally the slit exposure times can vary depending on the width and length of the slits; but I've found that this rule of thumb works well in almost all cases. I'd say the widths alone affect the exposure time. The lengths and distance between them affect the image circle size or angle of view. Tom, if you know the widths of the slits of your camera, could you do me a favor? Could you please substitute the focal length and width of slits in the following formula and find the result? f/stop = 0.886 x focal length / SQRT( A x B ) where SQRT stands for Square Root, A is the width of one slit and B is the width of the other slit Is the results anywhere close to f/180? (close in this case means above 128 and bellow 256) Many thanks, Guillermo ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] slit cameras?
Hi Brigitte, Further in Jim Moninger's article he mentioned that he saw the banding using .5mm slits and so increased the slit width to 2mm thus making more diffuse images with less banding. I can't see banding in the images that accompany his article. The use or elimination of banding is up to the photographer. Marnie Cardozo's images in the same issue of PJ are much sharper, but include banding. I've dedided to keep the banding in the iconoclast images. Tom - Original Message - From: brigitte.har...@london.glencore.com To: pinhole-discussion@p at ??? Sent: Wednesday, November 07, 2001 7:44 AM Subject: Re: [pinhole-discussion] slit cameras? Thanks guys. But what does it mean in pratical terms of constructing or pairing differently shaped slits. Is there anything I can do or avoid to do in order to eliminate or diffuse the problem? Regards, Brigitte. Guillermo pen...@home.com To: pinhole-discussion@p at ??? Sent by: cc: pinhole-discussion-admin@pSubject: Re: [pinhole-discussion] slit cameras? inhole.com 07/11/2001 13:08 Please respond to pinhole-discussion - Original Message - From: Tom Miller twmil...@mr.net Also, do you have any explanation why in some slit configurations there is a lot of banding (thin black lines) forming over the image? This quote is from Jim Moninger's article in the Pinhole Journal vol. 15 #1 : These are apparently caused by the light rays / waves with form the two separate images becoming out of phase with one another. Tom Not just out of phase but 180 degrees from each other. This -perhaps- are regions where light (wave) diffracted by one slit is at its maximum peak (+) and light (wave) diffracted by the other slit not just overlaps the former but happens to be at its lowest peak (-), the net effect is darkness, light from one slit canceling out with light from the other slit, weird, eh? This BTW, is called Destructive Interference. Guillermo ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ STRICTLY CONFIDENTIAL. The contents of this email and any attachments are strictly confidential and they may not be used or disclosed by someone who is not a named recipient. If you have received this email in error please notify the sender by replying to this email inserting the word misdirected as the message. ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] slit cameras?
Thanks guys. But what does it mean in pratical terms of constructing or pairing differently shaped slits. Is there anything I can do or avoid to do in order to eliminate or diffuse the problem? Regards, Brigitte. Guillermo pen...@home.com To: pinhole-discussion@p at ??? Sent by: cc: pinhole-discussion-admin@pSubject: Re: [pinhole-discussion] slit cameras? inhole.com 07/11/2001 13:08 Please respond to pinhole-discussion - Original Message - From: Tom Miller twmil...@mr.net Also, do you have any explanation why in some slit configurations there is a lot of banding (thin black lines) forming over the image? This quote is from Jim Moninger's article in the Pinhole Journal vol. 15 #1 : These are apparently caused by the light rays / waves with form the two separate images becoming out of phase with one another. Tom Not just out of phase but 180 degrees from each other. This -perhaps- are regions where light (wave) diffracted by one slit is at its maximum peak (+) and light (wave) diffracted by the other slit not just overlaps the former but happens to be at its lowest peak (-), the net effect is darkness, light from one slit canceling out with light from the other slit, weird, eh? This BTW, is called Destructive Interference. Guillermo ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ STRICTLY CONFIDENTIAL. The contents of this email and any attachments are strictly confidential and they may not be used or disclosed by someone who is not a named recipient. If you have received this email in error please notify the sender by replying to this email inserting the word misdirected as the message.
Re: [pinhole-discussion] slit cameras?
- Original Message - From: Tom Miller twmil...@mr.net Also, do you have any explanation why in some slit configurations there is a lot of banding (thin black lines) forming over the image? This quote is from Jim Moninger's article in the Pinhole Journal vol. 15 #1 : These are apparently caused by the light rays / waves with form the two separate images becoming out of phase with one another. Tom Not just out of phase but 180 degrees from each other. This -perhaps- are regions where light (wave) diffracted by one slit is at its maximum peak (+) and light (wave) diffracted by the other slit not just overlaps the former but happens to be at its lowest peak (-), the net effect is darkness, light from one slit canceling out with light from the other slit, weird, eh? This BTW, is called Destructive Interference. Guillermo
Re: [pinhole-discussion] slit cameras?
Hi Brigitte, Brigitte wrote: I have found that the slit nearest to the film plane (i.e. the inner slit) shapes the image contortion significantly more than the other slit. Is this your experience as well? Yes. The conclusion I've come to is that the inner slit determines the overall shape of the image when it hits the film plane and the outer slit determines distortion within this shape. There's a lot going on beyond this simple rule, but using it has helped me better match slits with subject. Also, do you have any explanation why in some slit configurations there is a lot of banding (thin black lines) forming over the image? This quote is from Jim Moninger's article in the Pinhole Journal vol. 15 #1 : These are apparently caused by the light rays / waves with form the two separate images becoming out of phase with one another. Tom
Re: [pinhole-discussion] slit cameras?
Tom, I have found that the slit nearest to the film plane (i.e. the inner slit) shapes the image contortion significantly more than the other slit. Is this your experience as well? Also, do you have any explanation why in some slit configurations there is a lot of banding (thin black lines) forming over the image? Regards, Brigitte. Tom Miller twmil...@mr.net To: pinhole-discussion@p at ??? Sent by: cc: pinhole-discussion-admin@pSubject: Re: [pinhole-discussion] slit cameras? inhole.com 07/11/2001 04:54 Please respond to pinhole-discussion Hi Mac, The format for the two images is 4x5. The rule of thumb I heard was to meter the scene at f90 and give it two more stops. This gives exposures of 1 or 2 seconds in bright sun with Ektachrome 64T (EPY). The few pinhole exposures I've made with 4x5 EPY were in the 16 second range. Naturally the slit exposure times can vary depending on the width and length of the slits; but I've found that this rule of thumb works well in almost all cases. (Also, I have a lab cross-process the EPY film to C41 and use the negative image to make color prints.) Tom - Original Message - From: SPRINGTYME font...@usa.net To: pinhole-discussion@p at ??? Sent: Tuesday, November 06, 2001 10:24 PM Subject: Re: [pinhole-discussion] slit cameras? Hi Tom! Thanks! What format? Was this 35mm? I think I'd like to give this a try. How do slit exposure times compare to pinhole? I'd gess a slit outputs a lot more light. Thanks Mac:-) ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ STRICTLY CONFIDENTIAL. The contents of this email and any attachments are strictly confidential and they may not be used or disclosed by someone who is not a named recipient. If you have received this email in error please notify the sender by replying to this email inserting the word misdirected as the message.
Re: [pinhole-discussion] slit cameras?
Hi Mac, The format for the two images is 4x5. The rule of thumb I heard was to meter the scene at f90 and give it two more stops. This gives exposures of 1 or 2 seconds in bright sun with Ektachrome 64T (EPY). The few pinhole exposures I've made with 4x5 EPY were in the 16 second range. Naturally the slit exposure times can vary depending on the width and length of the slits; but I've found that this rule of thumb works well in almost all cases. (Also, I have a lab cross-process the EPY film to C41 and use the negative image to make color prints.) Tom - Original Message - From: SPRINGTYME font...@usa.net To: pinhole-discussion@p at ??? Sent: Tuesday, November 06, 2001 10:24 PM Subject: Re: [pinhole-discussion] slit cameras? Hi Tom! Thanks! What format? Was this 35mm? I think I'd like to give this a try. How do slit exposure times compare to pinhole? I'd gess a slit outputs a lot more light. Thanks Mac:-)
Re: [pinhole-discussion] slit cameras?
Hi Tom! Thanks! What format? Was this 35mm? I think I'd like to give this a try. How do slit exposure times compare to pinhole? I'd gess a slit outputs a lot more light. Thanks Mac:-) Very nice work. Nowadays it is so easy to do special effects in Photoshop. But the reall fun is that you don't really know what you are going to get with real film! Hi Mac, You are correct: the subject is a flat sign. For His Master, the inner slit is question-mark-shaped and is horizontal in this image. The outer slit was a line that has about a 30-degree bend in the middle. It is vertical in this image and crosses the question mark in the center of the frame. Both slits were stationary. If I remember correctly, the film plane was slightly angled relative to the plane of the sign. One problem with photographing signs close up is that my tripods only go so high. And on sunny days, the camera's shadow can fall on the subject; angling the camera slightly often corrects this problem. Thank you for your interest. Tom
Re: [pinhole-discussion] slit cameras?
Hi Mac, You are correct: the subject is a flat sign. For His Master, the inner slit is question-mark-shaped and is horizontal in this image. The outer slit was a line that has about a 30-degree bend in the middle. It is vertical in this image and crosses the question mark in the center of the frame. Both slits were stationary. If I remember correctly, the film plane was slightly angled relative to the plane of the sign. One problem with photographing signs close up is that my tripods only go so high. And on sunny days, the camera's shadow can fall on the subject; angling the camera slightly often corrects this problem. Thank you for your interest. Tom - Original Message - From: SPRINGTYME font...@usa.net To: pinhole-discussion@p at ??? Sent: Monday, November 05, 2001 9:51 PM Subject: Re: [pinhole-discussion] slit cameras? Hi Tom! Very nice! can you explain tmiller_hismaster? Would i be correct that the slit is at an angle? Was the original object a flat sign? This was a stationary slit image? I'm more familiar with scanning slit cameras. Thanks Mac Hello Guy, Click on the link below. It should be the Welcome to the Upload Gallery page. Then click the Gallery 2001 link. The first two images, dated Nov 5, should be should be the ones. Tom Tom Miller wrote: (My second reply to this message...) I posted two double-slit color images to the discussion list upload gallery http://www.???/discussion/upload/ ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] slit cameras?
Gotcha! Interesting images. I have the same question as SPRINGTYME on his email. Cheers, Guy Tom Miller wrote: Hello Guy, Click on the link below. It should be the Welcome to the Upload Gallery page. Then click the Gallery 2001 link. The first two images, dated Nov 5, should be should be the ones. Tom Tom Miller wrote: (My second reply to this message...) I posted two double-slit color images to the discussion list upload gallery http://www.???/discussion/upload/ Hi Tom, Can you be more specific on the location in the Upload gallery? I looked around but there was too much stuff and gave up. Cheers, Guy
Re: [pinhole-discussion] slit cameras?
Hi Tom! Very nice! can you explain tmiller_hismaster? Would i be correct that the slit is at an angle? Was the original object a flat sign? This was a stationary slit image? I'm more familiar with scanning slit cameras. Thanks Mac Hello Guy, Click on the link below. It should be the Welcome to the Upload Gallery page. Then click the Gallery 2001 link. The first two images, dated Nov 5, should be should be the ones. Tom Tom Miller wrote: (My second reply to this message...) I posted two double-slit color images to the discussion list upload gallery http://www.???/discussion/upload/
Re: [pinhole-discussion] slit cameras?
Hello Guy, Click on the link below. It should be the Welcome to the Upload Gallery page. Then click the Gallery 2001 link. The first two images, dated Nov 5, should be should be the ones. Tom Tom Miller wrote: (My second reply to this message...) I posted two double-slit color images to the discussion list upload gallery http://www.???/discussion/upload/ Hi Tom, Can you be more specific on the location in the Upload gallery? I looked around but there was too much stuff and gave up. Cheers, Guy
Re: [pinhole-discussion] slit cameras?
Tom Miller wrote: (My second reply to this message...) I posted two double-slit color images to the discussion list upload gallery http://www.???/discussion/upload/ Hi Tom, Can you be more specific on the location in the Upload gallery? I looked around but there was too much stuff and gave up. Cheers, Guy They are early pieces from my Iconoclast series, which is continuing apace (turtle's pace?). The images are scans of slides of 16x20 prints. I'm a newbie at Photoshop, but used it to try to get some cyan out of the His Master image that the scan put in. There actually area areas of cyan and magenta in the original print, which is why it still looks like it does. Slit cameras seem to scatter color as well as distorting the images. I've noticed the same effect in other color images. Tom - Original Message - From: J.E. Patterson j...@lightjunkie.org To: pinhole-discussion@p at ??? Sent: Monday, November 05, 2001 11:59 AM Subject: [pinhole-discussion] slit cameras? Tom Miller wrote: Attendees who stayed for the question/answer/network session saw some of my dual-slit color photos from the Iconclast series. Can you say more about slit cameras, or where to find out more about them? I noticed them in the description of an upcoming pinhole workshop here[at PCNW in Seattle], but I won't be able to attend. Cheers, Jane -- J.E. Patterson www.lightjunkie.org | www.luxumbradei.com ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] slit cameras?
Andy, It's like in the real life. Ask any crooked slit how they became crooked and they will tell you that when they were a kid they used to be straight. But then they had these friends who would go out in the bars late at night, etc... You know the story...! It's the same thing all the time. I hope that you'll keep a close eye on your slits when you get some. Don't let them go out past 8:00 PM! Cheers, Guy Andy Schmitt wrote: I realize this is a truly stupid question but how does one make crooked slits thanks andy -Original Message- From: pinhole-discussion-admin@p at ??? [mailto:pinhole-discussion-admin@p at ???]On Behalf Of Tom Miller Sent: Monday, November 05, 2001 5:11 PM To: pinhole-discussion@p at ??? Subject: Re: [pinhole-discussion] slit cameras? Hi Jane, A slit is an elongated pinhole that, like a round pinhole, is an image forming device. A slit is about the same width as the diameter of a pinhole, but can be up to 2.5 to 3 long for a 4x5 negative. The slit can be a straight line: horizontal, vertical or diagonal. The image formed will take the characteristics of the slit. If the slit is horizontal, the image will be wider than normal; if it vertical, the image will be taller than normal. The fun part of slit photography is using curved and zig-zag and right-angle and question-mark-shaped and other wacky slits. Tf there are two slits between the image and the film plane, the image will take on characteristics of both slits. This is the second and truly fun part. The resulting images are so distorted! There isn't a good description of slit photography that I've found on the internet (yet). Good descriptions of slit photography and great resulting images are in the Pinhole Journal, vol 15 #1 and in Eric Renner's book Pinhole Photography, Rediscovering a Historic Technique. There's more about slits in the second edition than the first. Eric and Nancy at Pinhole Resource sell the Cardozo slit camera on their website www.pinholeresource.com. There is a picture of the camera on their products page. Tom - Original Message - From: J.E. Patterson j...@lightjunkie.org To: pinhole-discussion@p at ??? Sent: Monday, November 05, 2001 11:59 AM Subject: [pinhole-discussion] slit cameras? Tom Miller wrote: Attendees who stayed for the question/answer/network session saw some of my dual-slit color photos from the Iconclast series. Can you say more about slit cameras, or where to find out more about them? I noticed them in the description of an upcoming pinhole workshop here[at PCNW in Seattle], but I won't be able to attend. Cheers, Jane -- J.E. Patterson www.lightjunkie.org | www.luxumbradei.com ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] slit cameras?
I followed Marnie Cardozo's suggestions in the Pinhole Journal and made slits out of ortho/litho film. Hung the film in a south window for a week and developed it in stock Dektol for, well, a long time. It is opaque and can be cut with a sharp scissors into remarkable shapes. (I got the film from Freestyle a couple of years ago. Tom - Original Message - From: Andy Schmitt aschm...@warwick.net To: pinhole-discussion@p at ??? Sent: Monday, November 05, 2001 8:13 PM Subject: RE: [pinhole-discussion] slit cameras? I realize this is a truly stupid question but how does one make crooked slits thanks andy
Re: [pinhole-discussion] slit cameras?
(My second reply to this message...) I posted two double-slit color images to the discussion list upload gallery http://www.???/discussion/upload/ They are early pieces from my Iconoclast series, which is continuing apace (turtle's pace?). The images are scans of slides of 16x20 prints. I'm a newbie at Photoshop, but used it to try to get some cyan out of the His Master image that the scan put in. There actually area areas of cyan and magenta in the original print, which is why it still looks like it does. Slit cameras seem to scatter color as well as distorting the images. I've noticed the same effect in other color images. Tom - Original Message - From: J.E. Patterson j...@lightjunkie.org To: pinhole-discussion@p at ??? Sent: Monday, November 05, 2001 11:59 AM Subject: [pinhole-discussion] slit cameras? Tom Miller wrote: Attendees who stayed for the question/answer/network session saw some of my dual-slit color photos from the Iconclast series. Can you say more about slit cameras, or where to find out more about them? I noticed them in the description of an upcoming pinhole workshop here[at PCNW in Seattle], but I won't be able to attend. Cheers, Jane -- J.E. Patterson www.lightjunkie.org | www.luxumbradei.com ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
RE: [pinhole-discussion] slit cameras?
I realize this is a truly stupid question but how does one make crooked slits thanks andy -Original Message- From: pinhole-discussion-admin@p at ??? [mailto:pinhole-discussion-admin@p at ???]On Behalf Of Tom Miller Sent: Monday, November 05, 2001 5:11 PM To: pinhole-discussion@p at ??? Subject: Re: [pinhole-discussion] slit cameras? Hi Jane, A slit is an elongated pinhole that, like a round pinhole, is an image forming device. A slit is about the same width as the diameter of a pinhole, but can be up to 2.5 to 3 long for a 4x5 negative. The slit can be a straight line: horizontal, vertical or diagonal. The image formed will take the characteristics of the slit. If the slit is horizontal, the image will be wider than normal; if it vertical, the image will be taller than normal. The fun part of slit photography is using curved and zig-zag and right-angle and question-mark-shaped and other wacky slits. Tf there are two slits between the image and the film plane, the image will take on characteristics of both slits. This is the second and truly fun part. The resulting images are so distorted! There isn't a good description of slit photography that I've found on the internet (yet). Good descriptions of slit photography and great resulting images are in the Pinhole Journal, vol 15 #1 and in Eric Renner's book Pinhole Photography, Rediscovering a Historic Technique. There's more about slits in the second edition than the first. Eric and Nancy at Pinhole Resource sell the Cardozo slit camera on their website www.pinholeresource.com. There is a picture of the camera on their products page. Tom - Original Message - From: J.E. Patterson j...@lightjunkie.org To: pinhole-discussion@p at ??? Sent: Monday, November 05, 2001 11:59 AM Subject: [pinhole-discussion] slit cameras? Tom Miller wrote: Attendees who stayed for the question/answer/network session saw some of my dual-slit color photos from the Iconclast series. Can you say more about slit cameras, or where to find out more about them? I noticed them in the description of an upcoming pinhole workshop here[at PCNW in Seattle], but I won't be able to attend. Cheers, Jane -- J.E. Patterson www.lightjunkie.org | www.luxumbradei.com ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] slit cameras?
Hi Jane, A slit is an elongated pinhole that, like a round pinhole, is an image forming device. A slit is about the same width as the diameter of a pinhole, but can be up to 2.5 to 3 long for a 4x5 negative. The slit can be a straight line: horizontal, vertical or diagonal. The image formed will take the characteristics of the slit. If the slit is horizontal, the image will be wider than normal; if it vertical, the image will be taller than normal. The fun part of slit photography is using curved and zig-zag and right-angle and question-mark-shaped and other wacky slits. Tf there are two slits between the image and the film plane, the image will take on characteristics of both slits. This is the second and truly fun part. The resulting images are so distorted! There isn't a good description of slit photography that I've found on the internet (yet). Good descriptions of slit photography and great resulting images are in the Pinhole Journal, vol 15 #1 and in Eric Renner's book Pinhole Photography, Rediscovering a Historic Technique. There's more about slits in the second edition than the first. Eric and Nancy at Pinhole Resource sell the Cardozo slit camera on their website www.pinholeresource.com. There is a picture of the camera on their products page. Tom - Original Message - From: J.E. Patterson j...@lightjunkie.org To: pinhole-discussion@p at ??? Sent: Monday, November 05, 2001 11:59 AM Subject: [pinhole-discussion] slit cameras? Tom Miller wrote: Attendees who stayed for the question/answer/network session saw some of my dual-slit color photos from the Iconclast series. Can you say more about slit cameras, or where to find out more about them? I noticed them in the description of an upcoming pinhole workshop here[at PCNW in Seattle], but I won't be able to attend. Cheers, Jane -- J.E. Patterson www.lightjunkie.org | www.luxumbradei.com ___ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
[pinhole-discussion] slit cameras?
Tom Miller wrote: Attendees who stayed for the question/answer/network session saw some of my dual-slit color photos from the Iconclast series. Can you say more about slit cameras, or where to find out more about them? I noticed them in the description of an upcoming pinhole workshop here[at PCNW in Seattle], but I won't be able to attend. Cheers, Jane -- J.E. Patterson www.lightjunkie.org | www.luxumbradei.com
