I have done some research here and on youtube concerning a borescope to work with my smart phone. I was thinking of ordering one with a lens small enough for .22 barrels, but am wondering it this small lens might be problematic when working in .45 cal barrels. Most of my shooting is done in 7mm and above but but thought having that small lens might come in handy as a "just in case" situation might someday come up. Any advice would be greatly appreciated.