New answers tagged pinhole-cameras
Assuming a "medium" brightness (averaging day & night), ISO 25, f/64, with a 9-stop ND should get you to about 30 days. I haven't seen a reciprocity failure chart that goes that high, but I would assume that would carry you out as far as you want to go. A lot of assumptions, but it sounds possible to me.
As @BobT suggests, a sharp lens with neutral-density filter(s) could do the job, or you might use multiple short exposures. In any case, take into account reciprocity failure, which will; require yet longer exposures in very dim lighting, and which causes color shifts on most emulsions. It should be interesting to see the photos here, showing only really ...
You can also use standard black and white paper and then contact print it. It's similar to reversal processing but you don't need more chemicals other than stop and develop, it has the side effect of mirroring the image.
There are basically two ways to make a pinhole camera sharper. as Olin Lathrop said, the smaller the pinhole the sharper the image, but if it gets too small, diffraction come into play. There is an optimal diameter of the pinhole and this formula calculates it: Diameter = Constant x sqrt(Focal Length x Wavelength of light) There is a bit of mess about what ...
No, there is no lens design that allows for sharpening a pinhole image. This is because pinhole cameras by definition don't have lenses. You can replace the pinhole with a lens to get more sharpness with lower f-stops. That's why normal cameras have lenses instead of pinholes. With a pinhole, the sharpness gets better as the pinhole gets smaller, which ...
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