Analog film photography and cameras

Some Russian porn for you.
I lie, this is far from porn and is a very cheap lens, but it's so tiny and fits onto my EOS 100 and 40D using an M42 adapter
It's an Industar 50mm F3.5 pancake

on your 40D, the 'field of view' will be equal to an 80mm lens with a depth of field of about F/6 (despite the speed of F/3.5), so what you see through the EOS 100 won't be the same on your 40D.