Heya! Thanks for this! Great help. C: I'm just getting into it, but I only have the negative (developed) from the pinhole camera. You say you use enlargement paper to make it bigger? This confuses me, I have the small piece of negative, is there actually a way to make this bigger? o: Sorry if I'm hard to understand. Blergh. Thank you for the tutorial! Looking forward to trying it out!
So the space in between the film and the holes makes the aperture length?
That would be very interesting because with a larger outer wall you could also make a larger inner one. With more space in the inner drum you could try making such camera working with 35mm film.. or am I mistaken?
Well, your aperture is the size of the opening in the lens, or in this case, the pinhole. The space between the film and the hole is your focal length. Now, when you're doing pinholes with different sized papers instead of standard film, your focal length changes relative to the diagonal distance of your photographic material. I hope that makes sense, its hard for me to explain it without visuals.
For example, a piece of 35mm film in a normal SLR is about 43mm from corner to corner, right? Lens makers round this up to 50mm and that makes a standard lens, meaning there isn't a lot of distortion such as telephoto lenses that compress an image or wide angle that expand and sort o 'bow' out. So how your focal length reacts (IE, is it wide, is it normal, is it telephoto) depends on how far across the diagnals of your film or paper are.
You can make these work with 35mm film without any adjustments. Any type of photographic material that is sensitive to light, so paper or film, can go in - the only thing that changes is how the final image will appear - if you have a smaller strip of film less of the image will be captured. I actually experimented for awhile with strips of 35mm film taped to a piece of paper and then wrapped around the cylinder but it was such a pain to process I switched to the simple sheet of photo paper.
Sorry if I'm rambling or don't make sense, I'll try to clarify if you need.
Thanks. And it's all making sense (Luckily I spend some time with all the theoretical stuff before ^^)
So you are just taking photo paper? The same as where the prints go onto? Wouldn't that inverse the colors if you don't use any negatives first?
My idea was just to enlarge the central drum to be possibly able to take multiple exposures without replacing the photo material in the construct. So instead of taping the photo paper to the inner drum you could replace it by a roll of film material inside of the inner drum, just like the system of the 35mm film. Then the film would be transported around the inner drum and you could install something like a hoist(is that the correct endlish term?). You would just have to check how many turns you need for the film to be completely transported around the drum..
Hope that makes sense ^^ Maybe you will tell me that it's all crab.. but I think my idea isn't that bad..
Yep, plain photo paper just like you would use with the enlarger. It does reverse the tones but that is easy enough to correct. After you've developed the paper negative you simply stack it on top of a piece of unexposed photo paper. The negative should be emulsion down and the new sheet of paper is emulsion side up. Press them under your contact glass and print like normal, the image will reverse and look proper on the new sheet.
If you wanted to you could also scan the paper negative and simply press Ctl+I (windows) to invert it in photoshop.
--oh, now I understand what you mean! Well, you could definetly do that! If you made it large enough to wrap an entire roll of film around it though that would be one gigantic camera! You could always find a way to make a film transport though, I'm sure someone has a tutorial on the net somewhere I know there used to be a person on flickr who made a pinhole camera out of a pumpkin and 35mm cassettes that moved the film along just like it would in a camera - no changing out paper for every exposure.
Your idea isn't bad It'll just take a little work to figure out but I'm sure you can do it.
- and that wasn't exaclty my plan... I want to do s.th. like that [link] So the green circles are the full roll of film and its destination, the rec line is the film on its way. And the black is the Pinhole camera. The little circles are just some rolls to transport the film better..