The last of the rounded body Karats. Similar to the Karat 4.5, the Karat 3.5’s most significant difference is the use of Deckel’s Compur and Gauthier’s Prontor shutters. As these shutters are not self-cocking, a simple but ingenious method is used to remind the user to cock the shutter before shooting: when cocked, the shutter cocking lever is clearly visible in the viewfinder.

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The Karat 3.5 originally featured a 5cm f/3.5 Solinar lens; after the war, this was changed to the less expensive 55mm f/3.5 Apotar lens. Early Karat 3.5 models had a cast aluminum top cover with strap lugs and an aperture plate attached to the front lens standard. Later models had stamped covers and aperture scales on the lens bezel.