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This shutter release does go down quite some distance compared to most shutter releases.
I'm guessing that the lever action and shutter release were combined into one button on the Optima I and later models.
There is usually a yellow square or diamond seen in the viewfinder with two overlapping images.
The first What's New article describes the lens as a 39mm Apotar f3.9.Film advance is with a lever, something fairly advanced for this level of camera at the time.The film advance cocks the shutter and also increases the exposure count. There is also a cold flash shoe and a socket for a flash.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.