
This massive piece of glass is a lens used for X-ray Tv projection. One such lens connects to a X-ray machine cascading to a second lens which projects the image on a television camera. It has a fixed focus and lacks an aperture ring. It can be used for macro photography. The focus distance is about 30 cm and the back focus less than 1 cm. Sony NEX cameras are very well suited for this lens as you need to mount the lens close to the APS-C sensor. There is no vignetting with an 68 mm.

With an aperture for f/1 there is still an acceptable depth of field. There are some Rodenstock XR lenses with a record f/0.75 but focus then besomes very thin. The lens produces nice dreamy images and is therefore best for flower photography.




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