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Why won't a Kiev-88 to Pentacon Six adapter fit my Pentacon Six to Nikon F adapter?

I have a lens with a Kiev-88 mount and wanted to use it on Nikon F by stacking a Kiev-88 to Pentacon Six adapter with a Pentacon Six to Nikon F adapter. However, the Kiev-88 to P6 adapter is slightly too large to fit int

Can you mix only part of a powdered photo chemical kit, or should you mix the whole batch?

I use powdered darkroom chemicals because they store well dry, but once mixed their life is limited. Can I buy a larger powdered kit and mix only what I need by weighing out part of the powder and adding the proportional

Can Photoshop fix a badly out-of-focus photo?

I have a photo that was taken out of focus and looks quite blurred. I use Photoshop and want to know whether there is any realistic way to improve it, or if this kind of blur cannot really be fixed after the fact.

Can I mix film-processing chemicals from different manufacturers?

I’m processing film and currently use Adofix fixer, Adostop Eco stop bath, and Ilfotol wetting agent. I’m considering using Kodak D-76 as the developer. Is there any problem with using developer, stop bath, fixer, and we

Can you mix different brands of manual off-camera strobes?

I currently use two Vivitar 285 flashes off-camera in manual mode with inexpensive radio triggers. I’m thinking about adding two more lights, possibly more Vivitars or something like the LumoPro LP160. Will mixing differ

Is there a YCbCr color picker for Windows or Unix?

I want a software color picker that can sample on-screen colors and report values in YCbCr, so I can study ranges like blue sky or green grass for image analysis and scene detection. I'm specifically looking for somethin