worst thing I ever did was buy a Teslong scope. cleaned my muzzle loaders and my BP cartridge bores the same way for close to 60 years.
would have bet money they were squeaky clean. The bore scope doubled my work cleaning.
the best part of the bore scope is seeing hidden carbon deposits in the vent or flash channel. also lets you see into a patent breach.
Acceptable pictures can be achieved by dropping a AA size battery down the gullet. shine a light on the back side of the battery and snap your pictures.
also most supply houses sell the little button lights with brass housing that produce either a red or green light. this method is the easiest as you don't have to fight the light to photo.