[pinhole-discussion] slightly off topic - fresnel lens photography and a "scanner camera back"
In particular I am looking at lenses such as sheet magnifiers found in OfficeMax or a fresnel lens from an overhead projector. This is related to pinhole photography in that both allow you to build an extremely cheap cameras with unique photographic characteristics. Pinholes give your photos qualities related to diffraction focus. I would imagine fresnel lens photos would: - have an extremely small depth of field due to a huge aperture (though an aperture could, theoretically, be built) - allow you to shoot in low light conditions due to a huge aperture - produce a concentric ring pattern on the image due to the physical construction of the fresnel lens (I don't know how I feel about this yet. Maybe there is an upside to this.) Does anyone know of resources regarding fresnel lens photography? It would be great if someone has tried it or has some inspiring commentary. One could use this with film. I actually plan to use a flatbed scanner as a high resolution digital camera back for this. Not to worry, I will try pinhole as well with the "scanner camera back" and report on the results in the future. Thanks, Jarred
[pinhole-discussion] materials for fiber optic pinhole
If someone has time to try this out that would be great. I play the guitar in my spare time. I went to buy a set of nylon strings for a classical guitar and to my surprise 3 strings in the package were clear-- long clear solid "fiber optic" tubes-- it's not what they were intended for, but it will probably work if the material has an appropriate index of refraction (I used to know the physics behind this, I'd have to look it up). Basically go buy yourself a set of classical guitar strings (make sure it says "clear nylon"... also without the ball end would be best, though either can be used if you cut the ball end off) and you will have materials for three distinct cameras. The three clear strings measured exactly .0403", .0322", and .0280". You can get other thicknesses as well. The strings cost about $8.00 for the pack (they come in sets of 6 for a guitar) and are about 4 feet long. You want to cut both ends of your new fiber optic tubes perpendicular to the length of the tube to ensure you have the flattest ends possible. You do not want to round these because that will make a lens (interesting to try later). To get the pinhole effect, I believe you will want the ends to be as flat as possible. Good luck. I wish I had the time to try this myself and report on the results. I can see some great pictures coming from the new equipment. Jarred http://www.cs.uml.edu/~jmccaffr/
[pinhole-discussion] fiber optic pinhole
I have had an idea in the back of my mind for about a year and I am wondering if anyone has tried it yet in an artistic way. I am a college student (studying computer science), so I have not had time to try it myself. Fiber optic tubes are the thin plastic tubes often used in fiber optic decorations like false plant and light displays or fancy Christmas tree toppers, etc. Fiber optic tubing and cable is also used, in many different forms and factors, in the electronics industry. Light enters one end of the tube, reflect off from the insides of the tube until it reaches the other end, then exits the tube and is "focused" as a pinhole would be. You could think of it as a very long pinhole (not wide, but long rather). Fiber optic tubing would make a great pinhole. Tubing is cheap, of a known aperture, flexible, comes in lengths up to hundreds of feet (inches are probably enough), and it is small enough to allow extreme perspectives otherwise unachievable (imagine looking up at an ant using an ultra thin fiber optic tube lens). It is already in use in the "spy cam" industry, but I have yet to see the art world take this up. If anyone has tried (or does try) this, I'd love to hear about it. I am especially interested in what people do with the extreme perspectives that are possible using thin fiber optic tubes. Have a great day, Jarred McCaffrey
Re: [pinhole-discussion] December Mailing
Just to clarify, I meant digital downloads. Any thoughts? Jarred McCaffrey wrote: > How about making some high resolution prints available. There are some > issues with > distributing print quality files, but there is an audience (at least me, > probably > more) that wants to view the photos close up and possibly honor the artist by > printing for personal use. > > Jarred > > Guy Glorieux wrote: > > > Great idea! Count me in also! > > > > Guy Glorieux > > Montreal, Canada > > > > George L Smyth wrote: > > > > > --- James Kellar wrote: > > > > I would also like to announce that I will be organizing a print swap in > > > > the > > > > up coming year. If your interested in participating start sending me > > > > your > > > > ideas. > > > > > > > ___ > > Pinhole-Discussion mailing list > > Pinhole-Discussion@p at ??? > > unsubscribe or change your account at > > http://www.p at ???/discussion/ <>
Re: [pinhole-discussion] December Mailing
How about making some high resolution prints available. There are some issues with distributing print quality files, but there is an audience (at least me, probably more) that wants to view the photos close up and possibly honor the artist by printing for personal use. Jarred Guy Glorieux wrote: > Great idea! Count me in also! > > Guy Glorieux > Montreal, Canada > > George L Smyth wrote: > > > --- James Kellar wrote: > > > I would also like to announce that I will be organizing a print swap in > > > the > > > up coming year. If your interested in participating start sending me your > > > ideas. > > > > ___ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??? > unsubscribe or change your account at > http://www.p at ???/discussion/ <>
Re: [pinhole-discussion] Cracker Cam
Personally, I like the larger images. They take a bit longer, but I like the extra detail. One site had small images with the option to download or view extremely large images (Megabytes). I liked this very much. Jarred Andy Schmitt wrote: > old post was... > andy > Hello Again, > > The URL is http://www.p at ???/discussion/upload/images/divided.jpg > .And again I'm sorry the image is s big. I hope I won't make that > mistake again! > > "Keep on Pinholin'", > Tom > -Original Message- > From: pinhole-discussion-admin@p at ??? > [mailto:pinhole-discussion-admin@p at ???]On Behalf Of > font...@usa.net > Sent: Friday, December 01, 2000 5:24 AM > To: pinhole-discussion@p at ??? > Subject: Re: [pinhole-discussion] Cracker Cam > > Hello! > > Could I get the link again for the picture from the Cracker Cam. I can't > seem to find the original post. > > Thanks > > Mac > > ___ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??? > unsubscribe or change your account at > http://www.p at ???/discussion/ > > ___ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??? > unsubscribe or change your account at > http://www.p at ???/discussion/
Re: [pinhole-discussion] zone plate image quality
I have not done any experiments, but I am very interested in this topic. Ideally, a physics person should be contacted for numerical answers (perhaps someone on this list is a professor at a university and knows someone in the physics department?). Unfortunately, one of the qualities of zone plates and pinholes is that they always have a single optimum wavelength of light, depending upon their configuration. Focus would not be perfect with that wavelength, but focus decreases with wavelengths farther from the optimal. It would be interesting to see the difference in focus between a pinhole or zone plate used with full spectrum light versus using a filter to create monochromatic light of the optimum wavelength. The difference would likely be noticeable, perhaps remarkable (or perhaps not : ) ). Jarred "Richard M. Koolish" wrote: > I can think of a few things that might affect zone plate image quality, > the number of zones, the density of the dark and light zones, the thickness > or characteristics of the zone plate film. Has anybody done some experiments? > > ___ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??? > unsubscribe or change your account at > http://www.p at ???/discussion/
Re: [pinhole-discussion] OOps
just type in the url exactly the way it is in your browser. Cut and paste is easiest. For example: http://www.yahoo.com I typed in exactly "http://www.yahoo.com"; and your mail reader is smart enough to realize it should be a link to a website. Hope this helps! Jarred McCaffrey Tom Lindsay wrote: > Hello All, > > I forgot to tell you where to see the "51" Caddy. It's on the > disscussion/upload list. > > "Keep on Pinholin'", > Tom > > P.S. If someone would tell me how to do this the "correct" way I'd sure > appreciate it. Because I see other peoples URLs to their uploads and > wasn't quite sure what to do? > > ___ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??? > unsubscribe or change your account at > http://www.p at ???/discussion/
Re: [pinhole-discussion] What wood you use???
Whatever wood you use, there will be a possibility of warping. Warping occurs because not all parts of the wood dry (or absorb moisture if wood is dryer than the air around it) at the same rate. Professionals work with warping by letting the wood acclimate to the environment (during which it will do 99% of its shape changing) and then working the wood. Though many do not have the patience (or the time) it is recommended that you store your wood in your environment for a full month before doing any work. Jarred HypoBob wrote: > I recently make a pinhole camera out of 3/8 inch plywood and found, > somewhat to my surprise, that I was having troubles with warps and bends > in the plywood. I had always thought that one of the pluses of plywood > was that the plies canceled out the wood's tendency to warp. > > Therefore I am wondering what woods, or wood-like products, others have > found to be good for constructing a sturdy, light-tight box. > > Thanks, > Bob > > ___ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??? > unsubscribe or change your account at > http://www.p at ???/discussion/
