Now trying to find some black metal to punch pinholes into. Ordinary metals are "silver" coloured, and may be causing flare. Any one got ideas on black materials which will take a fine clean pin punched hole?
Dave's on the right track. And his pics are good.
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Now trying to find some black metal to punch pinholes into. Ordinary metals are "silver" coloured, and may be causing flare. Any one got ideas on black materials which will take a fine clean pin punched hole?
But I like the idea of blackening, as long as there is no gunk build-up in the hole, which then needs cleaning back to shiny metal. Or is the steel black all the way through?
If you use steel, heating up to a dull red and then quenching will turn it black. Many years ago, used to use old engine oil to quench wrought iron work in - With current health & safety rules, you'd be better off using clean oil.
DWThomas;811326 I don't actually punch the pinhole said:Raising a pimple and sanding, is a great way to get a variable size hole, by the degree of sanding. It also would stretch the metal, making it thinner than the undeformed stock. The pinhole must be in very, very thin material. Otherwise the light train is like going down a tunnel. It must be thin so the light defracts immediately around the edges.
We are nearly there...
I have just measured my old hole... pinhole that is. It is 0.4mm (1/64" for you non metric types), and at 120mm from the film plane it is f200, and covered a 4x5 piece of 100iso film. I'd reckon 1/64th should be a relatively easy drill size to get, so can consider drilling through v. thin super black plastic sheet, when I find it.
The Holga landscape pinhole cameras have black plastic pinholes.
It's all about the hole Johnny9fingers, so I hope I haven't highjacked your post. Get your camera suitable for the film, but think about the hole. If youve got an old folder, just take the lens out and put a pinhole there, nice easy film transport already incorporated.
I have a Mamiya Universal Polaroid setup (3x4, not 4x5) that I might think about trading, but I am ignorant as to Pentax's digital offerings. Does the K20D take old manual K mount lenses? I sometimes want a digital with more resolution than my Canon 10D.
I've got a Mamiya Universal with Polariod back and just tried the FP-100C instant color film, which makes great pictures, but I am unable to make an image transfer. It was my first attempt and I'm wondering if anyone has any experience with the Fuji materials for image transfers. I think this material is also available in 4x5, and a black and white FP-3000B polaroid type is rated at EI 3200. And the Mamiya is great, but for 4x5 the Speed or Crown Graphic cameras are great and can be inexpensive.
not sure about image transfer, but there is a dude in Spain that with the FP-100C part that you put in the trash? makes the negative of that actual picture to show up, ready to go into the enlarger. The method is simple, you use a brush and regular bleach and brush the dark side and the negative appears like magic. The bleach can only go into one side of the negative, I guess the non emulsion side, if it goes on the other side it destroys the image. After that you washed to get rid of the bleach. It only works with the Fuji.
Do you have to do the bleach processing right away, or can you store a batch of them and do it later?
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