Hey. I recently found at my local antique store, an Argus 21 Markfinder. This is my first, and probably my only, Markfinder I will get.
The problem with it is I'm not quite sure how to focus it! It focuses like a regular SLR, but I have no way of knowing if the focus is right or not. I have heard this model of camera be called the Argus "Guess-matic" because the photographer has no way of knowing the correct focus.
If there are any 21 users out there that want to give me a tip or two on focusing, that would be appreciated!