Leica Summarit-S 35mm f/2.5 ASPH. CS - Leica S Mount

The Leica Summarit-S 35mm f/2.5 ASPH. CS is a wide-angle prime lens for the Leica S medium format system, providing a focal length equivalent to 28mm in full-frame terms. This 'CS' version incorporates an integrated central shutter, allowing for flash synchronisation at speeds up to 1/1000s. The optical design utilises two aspherical elements to ensure high resolution and contrast across the entire 30x45mm sensor area. When buying a used CS variant, it is essential to verify the leaf shutter's operation and total actuation count. SDS tests the shutter at all speeds to ensure consistency and checks the autofocus drive for responsiveness. Buyers should also inspect the rear mount for wear and ensure the rubberised focus ring has not become tacky or loose, a common point of wear on professional medium format glass.