The Nettar series by Zeiss Ikon was a successful range of self-erecting folding cameras for 120 roll film. Zeiss Ikon always advertised the Nettar …
The Optima Ia is a 35mm film viewfinder camera made by Agfa and introduced in 1962. The camera has an optical bright frame finder with parallax marks and red or green signals for correct exposure in the viewfinder. The distance setting ring has symbols around the front lens element, and an aperture setting ring with separate aperture setting scales for B-mode or flash synchronized speed 1/30 seconds. The automatic exposure mode (A-mode, without flash) has to be switched on with the same ring. Film speed setting is possible up to 200 ASA.
The lens is an Agfa Color-Agnar 45mm f/2.8. The shutter release is on the right of front plate. The camera’s bottom and back part can be removed very easily for loading the film. Film advance is done with a small advance lever on the top plate. The exposure counter is readable from the side. The body is plastic.
See the original manual here: