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Owner reviews: Schneider-Kreuznach Retina-Tele-Xenar 200 mm f/ 4.8
Sharp, compact (short), heavy, inbuilt tripod mount, can be found at a reasonable price.
A nice lens for distant tree portraits, landscape details, clouds at sunset (provided the lens hood is used). Like the 135mm f/4 TeleXenar, the hood is a press fit and becomes loose with time. I use PVC tape to hold it on.
Focussing ring is in an awkward position, a bit like many Russian lenses in its ergonomics. Prone to CA (especially green fringing) if not perfectly in focus.
Unlike most lenses, dust on the inside of the rear element will show up when used with an APS-C sensor.
MFD is close to 10m, but closer focus can easily be achieved with a helicoid adapter etc.
Rear element unscrews with a lens tool, in an anti-clockwise direction, for cleaning.
Two internal springs (perhaps added as an afterthought for snappy iris action) can come loose. For manual use on a mirrorless camera, they are redundant and can be removed, after unscrewing four screws and lifting out the rear metal assembly.
On a mirrorless camera, registration distance of the adapter must be exact for good optical performance with this lens - I used a helicoid adapter to enable this. At least one brand of DKL to NEX adapter is too short (presumably the manufacturer wanted to ensure infinity focus).
The rear UV filter is not required on a digital camera, and unscrews in the standard anticlockwise direction from the back of the lens.