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Darkshop Posts

mini 5×12 camera, part 2

April 24

Bellows. I hate them so. I did a paper mock-up but still the pleats are folding oddly. I think the geometry of this isn’t quite right. The front standard is fairly close to the size of the back on the side, so there’s not much taper there- 7 3/4 inches to 5 1/4 . But on the tops and bottom it’s 14 3/4 to 5 1/4 . There seems to be nowhere for some of the folds to go. I think the mock-up worked because it was just kraft paper, no stiffeners. I should have just made a @!$# bag bellows- I rarely use anything longer that a 250 lens anyway. Edit- updated way to make bellows at end of page-

Continue » mini 5×12 camera, part 2

4×10 film holders

parts, 4×10 film holders

Having just finished, here’s a few fresh observations on making film holders.
Too thin is problematic- this reduces options for light baffles, makes joinery very thin, especially the darkslide baffle rail. I found some .03″ velvet (plain backed) and used up the .002″ brass shim stock left unused from my last adventure in filmholders. All said and done it worked out well, just tested one out in the sun loaded with film for a few minutes and no leaks. Wouldn’t want to make them any thinner. But the extra thinness does allow the option of  making an adapter instead of an entire new back- the shim needed to bring the film holder to same spot as the ground glass can double as the base for the adapter, which would simply slide into the  existing 5×12 back. Continue » 4×10 film holders

About this site

While the posts here may give a general sense of what’s involved in a particular project,  this blog is not intended to provide practical instruction. All the information here should be considered ‘as-is’. Reader beware, use at your own risk, etc. That said, none of these projects are particularly challenging- all of them involve very old designs and very old processes and are achievable with very basic tools, some patience and common sense. While I’m happy to answer specific questions, I don’t have the time to provide detailed drawings or measurements, step-by-step instructions, or assistance with modifying these projects to suit your individual needs.