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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!
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Yes I just bluetac my filter behind the pinhole
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 Originally Posted by DWThomas
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. . . .
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.
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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.
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