Hi Randy. I also use 29R filters behind the pinhole. I use gel filters, which I cut into pieces to fit empty 35mm slide carriers for easy handling. I think I got six filters from one gel. A pop of canned air before loading the film seems sufficient to keep dust off.
My experience with dust etc. using pinhole has been so bad for this reason that I decided that it simply isn't worth it. I was supposed to contribute an article about using filters with pinhole. I declined for that reason.
Originally Posted by papagene
The only way I could think it would work alright would be to use a heavily died gelatin and actually fill the hole with it.
I just thought of another way, though. Using long exposures, you could keep the filter in motion for the duration of the exposure.
Keeping the filter clean as has been suggested, and the idea of putting the filter right up against the hole are very good ideas. In my experiments, it was impossible for me to keep the filter clean, working out in the desert in Eastern Washington with the wind blowing.
If you were to use the filter right up against the pinhole, it might not produce the noted anomalies if the filter were taped inside. Worth trying.
Last edited by bowzart; 07-26-2008 at 02:35 PM. Click to view previous post history.
Reason: thought of more ideas.