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The main difference is the material, the black version has a black painted brass barrel, while the brass version has a polished brass barrel.
Buckshot Roulette

I recommend using a lens hood. It will help protect your lens from snow and other debris. It will also help reduce glare and improve contrast. pokedoku

Those pictures are historic and original. I'm impressed with the second one.

The Ica Niklas lens you recently purchased appears to be a vintage ICA lens produced in the 1920s. Your research indicates that the lens is made up of a front cemented doublet, three rear elements,...

How about making your own nitric acid by combining concentrated sulfuric acid and sodium nitrate is one potential workaround for the nitric acid. Inexperienced chemists should avoid using this...