Re: OT: FILM shot wins Pop Photo contest
I'm mostly view-camera illiterate, so I'm sure a more informed voice could chime in here, but I'm seeing that maximum coverage is achieved on some lenses only when stopped down significantly. On a camera with rise, swing and tilt capability, I'm guessing that maximum coverage could only be achieved with the lens and film back parallel (I'm sure someone will correct me if that is inaccurate). With regard to the 35mm lenses, yes, the Pentax Forums lens database lists the FOV for horizontal and diagnonal for both 35mm full frame and APS-C sensors. Darren Addy Kearney, Nebraska FOV is the angle that comes in the front. Coverage is what comes out the back. The convention (there is no governments standard like Watts RMS in 8 ohms, from 20-2Hz in audio) is f22 when focused @ infinity. That gives you your minimum film plane coverage for a lens. Many lenses are not sharp as they get close to the edge of coverage. That is only documented anecdotally, so it is best to have several mm extra coverage to compensate. So we use reference tables like this http://www.graflex.org/lenses/lens-spec.html to check out lens coverage. The Super Symmar XL has plenty of coverage for 8x10. https://www.schneideroptics.com/ecommerce/CatalogItemDetail.aspx?CID=169IID=7634 But few have the wallet. :-( The diagonal FOV on a 20mm Takumar lens is only 94 degrees, 35mm full frame The diagonal FOV on a 15mm Takumar lens is 111 degrees, 35mm full frame. It is stamped on the lens as having 105 deg coverage. That falls somewhere in between these two focal lengths. Sincerely, Collin Brendemuehl He is no fool who gives what he cannot keep to gain what he cannot lose -- Jim Elliott -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
http://www.popphoto.com/gallery/18th-annual-readers-photo-contest 8x10 film And a $2700 lens that is the equiv. of the Pentax 15mm rectilinear on a full frame 35mm. And clearly post-processed (very well). Still, I'm happy to see a film shot get such an award. And it is a stunning image. Darren Addy Kearney, Nebraska That's definitely a stunning scene and a night shot at that. I didn't know there were geysers anywhere besides the Yellowstone Basin in the continental US. I'll have to check how far away this. Likely just as far, or further, than Yellowstone which is about 8 hours. A Nevada site may be more accessible in winter though. Thanks for sharing. Tom C. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
http://www.popphoto.com/gallery/18th-annual-readers-photo-contest 8x10 film And a $2700 lens that is the equiv. of the Pentax 15mm rectilinear on a full frame 35mm. And clearly post-processed (very well). Still, I'm happy to see a film shot get such an award. And it is a stunning image. Darren Addy Kearney, Nebraska That's definitely a stunning scene and a night shot at that. I didn't know there were geysers anywhere besides the Yellowstone Basin in the continental US. I'll have to check how far away this. Likely just as far, or fu -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
From: Tom C http://www.popphoto.com/gallery/18th-annual-readers-photo-contest 8x10 film And a $2700 lens that is the equiv. of the Pentax 15mm rectilinear on a full frame 35mm. And clearly post-processed (very well). Still, I'm happy to see a film shot get such an award. And it is a stunning image. Darren Addy Kearney, Nebraska That's definitely a stunning scene and a night shot at that. I didn't know there were geysers anywhere besides the Yellowstone Basin in the continental US. I'll have to check how far away this. Likely just as far, or further, than Yellowstone which is about 8 hours. A Nevada site may be more accessible in winter though. Thanks for sharing. Tom C. There were apparently geyser fields at Steamboat Springs and Beowawe in Nevada up until the 1980s 1990s. They were destroyed by drilling to create geothermal power plants. There are other minor geyser fields in the Western US. I think they're all outliers of whatever created Yellowstone. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
A Nevada site may be more accessible in winter though. Plus you have Valley of Fire State Park (north of Las Vegas) Red Rocks (west of Las Vegas). Kenneth Waller http://www.pentaxphotogallery.com/kennethwaller - Original Message - From: Tom C caka...@gmail.com Subject: Re: OT: FILM shot wins Pop Photo contest http://www.popphoto.com/gallery/18th-annual-readers-photo-contest 8x10 film And a $2700 lens that is the equiv. of the Pentax 15mm rectilinear on a full frame 35mm. And clearly post-processed (very well). Still, I'm happy to see a film shot get such an award. And it is a stunning image. Darren Addy Kearney, Nebraska That's definitely a stunning scene and a night shot at that. I didn't know there were geysers anywhere besides the Yellowstone Basin in the continental US. I'll have to check how far away this. Likely just as far, or further, than Yellowstone which is about 8 hours. A Nevada site may be more accessible in winter though. Thanks for sharing. Tom C. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
Learned something today. Never even heard of plasmats before. That (winning) shot looks FAR wider (to my eyes) than a 24mm on a 35mm film camera. I was looking at the specs and comparing the field of view it gives to the equiv. focal length with similar field of view on a 35mm. Not sure if that's the proper way to compare apples and oranges, but when the lens specs say 105 degree maximum coverage I'm guessing that would be most like the diagonal FOV on a 35mm lens. The diagonal FOV on a 24mm Takumar lens is only 84 degrees, 35mm full frame. The diagonal FOV on a 20mm Takumar lens is only 94 degrees, 35mm full frame The diagonal FOV on a 15mm Takumar lens is 111 degrees, 35mm full frame. So extrapolating, it looks like the FOV would be similar to an 18mm lens on a 35mm full frame. If that's not the proper way to look at it, I'd welcome a correction. Darren Addy Kearney, Nebraska -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
I don't know the answer to your question. But I am curious about one thing in your note - when others talk about FOV, I have always visualized the horizontal coverage as the issue. I just looked at Wikipedia for FOV info and they point out that (of course!) you can measure the FOV horizontally, vertically, or diagonally. I am curious why you use the diagonal in this case. Did the specs of the lens you are referring to explicitly refer to diagonal FOV? stan On Dec 26, 2011, at 10:11 PM, Darren Addy wrote: Learned something today. Never even heard of plasmats before. That (winning) shot looks FAR wider (to my eyes) than a 24mm on a 35mm film camera. I was looking at the specs and comparing the field of view it gives to the equiv. focal length with similar field of view on a 35mm. Not sure if that's the proper way to compare apples and oranges, but when the lens specs say 105 degree maximum coverage I'm guessing that would be most like the diagonal FOV on a 35mm lens. The diagonal FOV on a 24mm Takumar lens is only 84 degrees, 35mm full frame. The diagonal FOV on a 20mm Takumar lens is only 94 degrees, 35mm full frame The diagonal FOV on a 15mm Takumar lens is 111 degrees, 35mm full frame. So extrapolating, it looks like the FOV would be similar to an 18mm lens on a 35mm full frame. If that's not the proper way to look at it, I'd welcome a correction. Darren Addy Kearney, Nebraska -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
I'm mostly view-camera illiterate, so I'm sure a more informed voice could chime in here, but I'm seeing that maximum coverage is achieved on some lenses only when stopped down significantly. On a camera with rise, swing and tilt capability, I'm guessing that maximum coverage could only be achieved with the lens and film back parallel (I'm sure someone will correct me if that is inaccurate). With regard to the 35mm lenses, yes, the Pentax Forums lens database lists the FOV for horizontal and diagnonal for both 35mm full frame and APS-C sensors. Darren Addy Kearney, Nebraska -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
I should add that FOV is really only a perfect comparison to use when comparing similar ratio rectangles (or other shape). It's not just a function of the lens but the image circle crop. With that in mind some adjustment would be needed to strictly compare a 4x5 (or similar ration 8x10) view camera lens FOV with a 24x36mm 35mm frame (which would need to be 24x30mm to be a straight-across comparison). Darren Addy Kearney, Nebraska -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
On 26/12/2011 10:04 PM, Darren Addy wrote: I'm mostly view-camera illiterate, so I'm sure a more informed voice could chime in here, but I'm seeing that maximum coverage is achieved on some lenses only when stopped down significantly. On a camera with rise, swing and tilt capability, I'm guessing that maximum coverage could only be achieved with the lens and film back parallel (I'm sure someone will correct me if that is inaccurate). I think all lenses do get an increased image circle as it is stooped down. Generally this is only important to the large format user who depends on a large image circle to allow the use of camera movements. Often, in order to cover the entire format when using significant tilt of the lens or shifting of the lens or film, the lens also needs to be stopped down to secure coverage of the corners of the film -- William Robb -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
Actually a lot of the newer lenses don't get much in the way of extra coverage as they are stopped down wheras some of the older designs get a huge amount. The difficulty is defining coverage, since a lot of the older lenses get very soft at the edges. In some cases older examples of the same design will have more coverage than newer ones since the manufacturers have tweaked them to reduce the image circle so that the edges don't get too soft. If you are contact printing from an ULF neg, say 12x20, then you really don't need much resolution but if you are doing mural prints from 4x5 the you will want it to be bleedingly sharp across the entire neg. The 8x10 and ULF guys will often distinguish between the area that is illuminated and the area that is covered, with coverage being a subjective measurement based on the photographer's own requirements for sharpness. The phrase YMMV gets used a lot in discussions of LF lenses. Paul Ewins Melbourne, Australia 27/12/2011, at 3:14 PM, William Robb wrote: On 26/12/2011 10:04 PM, Darren Addy wrote: I'm mostly view-camera illiterate, so I'm sure a more informed voice could chime in here, but I'm seeing that maximum coverage is achieved on some lenses only when stopped down significantly. On a camera with rise, swing and tilt capability, I'm guessing that maximum coverage could only be achieved with the lens and film back parallel (I'm sure someone will correct me if that is inaccurate). I think all lenses do get an increased image circle as it is stooped down. Generally this is only important to the large format user who depends on a large image circle to allow the use of camera movements. Often, in order to cover the entire format when using significant tilt of the lens or shifting of the lens or film, the lens also needs to be stopped down to secure coverage of the corners of the film -- William Robb -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
On Sat, Dec 24, 2011 at 09:52:56AM -0600, Darren Addy wrote: http://www.popphoto.com/gallery/18th-annual-readers-photo-contest 8x10 film And a $2700 lens that is the equiv. of the Pentax 15mm rectilinear on a full frame 35mm. And clearly post-processed (very well). Still, I'm happy to see a film shot get such an award. And it is a stunning image. Darren Addy Kearney, Nebraska I started to brows through this gallery. It's a bit awkward to see both the image and the technical data (at a size that's possible to read), and that's on a 1920x1200 resolution screen. Maybe I should try rotating my secondary display to a portrait orientation ... I must admit that while I was perusing the first half a dozen images the recent observations here about the prevalence of highly-saturated images came to my mind. By the time that BW image came along I was ready for it. And the twelfth image made an interesting statement about colour, too. I'll look through some more of the images when I've got a few less things to do (assuming we can tear ourselves away from Skyrim, that is :-). P.S. That 12th image appears to duplicate the caption from the 2nd image. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
On Dec 24, 2011, at 7:52 AM, Darren Addy wrote: http://www.popphoto.com/gallery/18th-annual-readers-photo-contest 8x10 film And a $2700 lens that is the equiv. of the Pentax 15mm rectilinear on a full frame 35mm. And clearly post-processed (very well). Still, I'm happy to see a film shot get such an award. And it is a stunning image. Oddly, the winning photo doesn't do much for me, though it's interesting to note that it isn't far from where burning man is held. I'm puzzled by the comment on the next photo: Tech Specs: Canon PowerShot G9 (at 35mm equivalent); exposure, 1/1000 sec at f/4, ISO 80. What do they mean 35mm equivalent exposure? Are seconds faster on compact cameras? I like the BW of the peacock, but the text on the shot is from the photo with the rower. I saw this one of the seals: http://www.popphoto.com/gallery/18th-annual-readers-photo-contest?image=17#container And thought I've seen the seals do that down in Santa Cruz. Then I noticed that it was taken in Santa Cruz. Darren Addy Kearney, Nebraska -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
on 2011-12-24 12:14 Larry Colen wrote I'm puzzled by the comment on the next photo: Tech Specs: Canon PowerShot G9 (at 35mm equivalent); exposure, 1/1000 sec at f/4, ISO 80. What do they mean 35mm equivalent exposure? Are seconds faster on compact cameras? i think they meant 35mm equivalent focal length after looking through the gallery, i enjoyed the landscapes best; they start here: http://www.popphoto.com/gallery/18th-annual-readers-photo-contest?image=33#container also these two, another landscape filed under architecture: http://www.popphoto.com/gallery/18th-annual-readers-photo-contest?image=30#container and a really eye-catching klipspringer, which like several of the photos is over 1200px tall (they should have scaled them to the browser window): http://www.popphoto.com/gallery/18th-annual-readers-photo-contest?image=19#container i might have missed one but i didn't notice any Pentax shots -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
On Dec 24, 2011, at 11:42 AM, steve harley wrote: on 2011-12-24 12:14 Larry Colen wrote I'm puzzled by the comment on the next photo: Tech Specs: Canon PowerShot G9 (at 35mm equivalent); exposure, 1/1000 sec at f/4, ISO 80. What do they mean 35mm equivalent exposure? Are seconds faster on compact cameras? i think they meant 35mm equivalent focal length But they didn't list a focal length. after looking through the gallery, i enjoyed the landscapes best; they start here: http://www.popphoto.com/gallery/18th-annual-readers-photo-contest?image=33#container I'll be damned! One of the landscape photos caught my eye as particularly nice and it turns out it was shot by Peter Lik. It might be the first of his shots I've seen that I've liked. The alligator shot is also nice. also these two, another landscape filed under architecture: http://www.popphoto.com/gallery/18th-annual-readers-photo-contest?image=30#container and a really eye-catching klipspringer, which like several of the photos is over 1200px tall (they should have scaled them to the browser window): http://www.popphoto.com/gallery/18th-annual-readers-photo-contest?image=19#container There were some very impressive animal shots in that collection. i might have missed one but i didn't notice any Pentax shots -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
on 2011-12-24 12:56 Larry Colen wrote On Dec 24, 2011, at 11:42 AM, steve harley wrote: on 2011-12-24 12:14 Larry Colen wrote I'm puzzled by the comment on the next photo: Tech Specs: Canon PowerShot G9 (at 35mm equivalent); exposure, 1/1000 sec at f/4, ISO 80. What do they mean 35mm equivalent exposure? Are seconds faster on compact cameras? i think they meant 35mm equivalent focal length But they didn't list a focal length. yeah — my take was that _was_ the (35mm equiv.) focal length: 35mm; it certainly should have been worded better; the notes on these photos are in general a mishmash unworthy of a good editor; many deserve more precise location info, for example -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: FILM shot wins Pop Photo contest
http://www.popphoto.com/gallery/18th-annual-readers-photo-contest 8x10 film And a $2700 lens that is the equiv. of the Pentax 15mm rectilinear on a full frame 35mm. And clearly post-processed (very well). Still, I'm happy to see a film shot get such an award. And it is a stunning image. Darren Addy Kearney, Nebraska No. 300mm is the 8x10 normal so 150mm is like a 24mm on 135, or roughly 18mm on the Pentax DSLR. It is not rectilinear at all. It is a true plasmat wide angle with a normal rendering. Plasmats have the best image rendering but are not very fast. The rare symmetricals wider than 5.6 have a glow and even 5.6 can be questionable in certain situations. Of the 5 LF lenses I own, 2 are plasmats, 2 are Tessars, and 1 (BL/Zeiss Protar VII) is especially unique. Sincerely, Collin Brendemuehl He is no fool who gives what he cannot keep to gain what he cannot lose -- Jim Elliott -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
