I have an older Schneider Press-Xenar 135 f3.8 lens for a Linhof Tech III versio n 5. The lens is marked in red "Linhof". Serial #4167121. I would like to fin d information re: the lens and in particular technical test results. There are some for the Xenotar 135 f.3.5 but nothing I can find on this lens. I am especi ally curious re: circle of coverage, as it handles swings etc. quite well but is much less capable re rises and falls.