I recently picked up an Ikon 515/16 folder with the flip up viewfinder in fantastic cosmetic condition. I'm going to run some film through it tonight to see how is is mechanically.

My question is on focusing the camera. As there is no rangefinder and only distance markings on the lense focus ring do you just set the aperture and distance and hope for the best? I see no other alternative.

Were the old timers just fantastic judges of distance or what?