ROBOT Schneider Tele-Xenar 1 : 3.8 / 75

This lens just covers full format, it was built for 24x24mm square format.

Focal length: 75mm
Mount: Robot M26
Aperture: F 3.8 - F 22
Min focus distance: 1m
Length (from flange): 44/50mm [+ 13mm for 2 adapters]

Diameter: 46mm
Weight: 200gr.

Some pictures:

A7 and the lens.

Sample pictures: You may click on the sample image (except closest focus) for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. Focus is on infinity (except closest focus). These pictures are hand-held out of the window of my holiday home, so there might be blur by shake, especially at F22.

F 3.8.

F 8.

F 22.

Closest focus (F8) is 78cm from outermost edge of the lens. Focus on the program wheel of the camera.

This lens just covers full format, it was built for the 24x24mm square format of the Robot cameras. The adaption to the A7 is easy, the focal flange distance of the Robots is 31mm. That's not far from the M39 which is 28.8mm. So you add a 2.2mm adapter to a M39 one and you are there. M26 to M39 adapters a readily available on the web and they can be cheap. The Robot lenses are relatively small and they are fine for APS-C.

This lens is relatively small for a 75mm lens and has a multi-blade iris, perfectly round. According to the serial number, this is an old lens, made in late 1952. As you can see on the sample pictures, with wider apertures there is a bit vignetting in full format, not visible on the 24x24mm Robot cameras. Although the glass of the lens is fine, there is low contrast with a digital camera. On film it's fine. Maybe the lens design, old coating and/or the small M26 diameter on longer lenses are not good for digital cameras.