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When set to the A setting, you have to slide down the big button on your left hand side before operating the shutter release on top.A comment by Marc Rochkind at Another 50th Anniversary - The Agfa Optima, indicates pushing the big button or lever on the side of the lens supplies the necessary force for the camera to select the aperture and shutter speed since the only other energy input is the very minimal voltage supplied from the Selinium meter.This section contains over 70 still cameras from A to Z (Agfa to Zeiss Ikon) using 35mm film but not having single lens reflex viewing and focusing. The third way is rangefinder focusing which provides precise focusing. Often there are two, three or four distance zones often represented by icons to help the user.Behind the focus ring is the shutter speed selection ring.The aperture ring is behind that, closest to the camera. You set the shutter speed and aperture by estimation or a separate light meter.A follow up entilted Agfa Optima: Pop Photography 1959 Articles to the original discussion above has links to two November 1959 Popular Photography articles.The first What's New article describes the lens as a 39mm Apotar f3.9.
The view through this viewfinder or window can hence be slightly different from the image that hits the film.
There is usually a yellow square or diamond seen in the viewfinder with two overlapping images.
You rotate the focusing ring until the two images merge together.
For further information see The Living Image and Olympus 35mm Rangefinder Cameras.
Rangefinder focusing became common in the 1950s and remained popular until being largely replaced by the fourth focusing method, autofocus which begin with the Konica C35 AF in November 1977.
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This shutter release does go down quite some distance compared to most shutter releases.