In theory, narrowing the spectral bandwidth for B&W could improve the sharpness, can't say I've ever tried it. The light wavelength enters into the equation for pinhole optimization.
A couple of years back I crudely taped an 80B filter over my SQ-A pinhole adapter to try an outdoor shot and finish off a roll of tungsten transparency film; it worked!
Yes I just bluetac my filter behind the pinhole
Long ago I did some experimenting with films and filters from blue sensitive to IR, and found that it does make a slight difference. Fine-tuning pinholes and spectral response for optimum results makes insignificant improvement in almost all pinhole photography.
Originally Posted by DWThomas
I do exactly as tokengirl does. I have little chips of R25 gel behind the hole. I got nine pieces of filter from one gel, which is fairly economical.
Acros has already been mentioned, but also worth a try is Tmax 100, as far as avoiding great compensation for reciprocity failure.
Found this thread again. I've thought up another option:
I have a full set of 77mm filters I would like to utilize for my pinhole camera. In order to do this, I ordered a threaded step up ring which will be glued to the camera to mount these to. Now, the real question is, of course, behind or in front of the lens? Much easier to change on front, but the concern about extreme DOF is legit. Maybe behind and reaching in, who knows...
Yeah, I'm not sure how much it would matter. Since it's a sort of ray tracing exercise to begin with, I might think front or back would potentially have the same problems. Maybe the inside mount would have less opportunity to gather additional dust in field use. I have a pinhole body cap adapter I made for my Bronica which has the flap shutter behind a circular plate and a sunshade (made from a black spray paint can lid!) that would allow me to easily put a filter adapter on the front. I considered it, but have never gotten around to it.
My later cameras have a pivoting flap shutter on the front and would more or less have to put the filter inside. Being that they are LF, with standard filmholders, that wouldn't be all that inconvenient. (No problem at all reaching inside the 8x10 version! :blink:)
Dang, now the wheels in my brain are spinning for rev. 2 for the next WPPD!