BTW, the CV LH-2 square hood fits the 50/2.5 and 28/3.5 Skopars perfectly. It does not cause any vignetting on the 28mm with my R-D1, but I don't know how it would fare on the M8 or full-frame.
I was under the impression that Cosina built the 40/2.8 for Rollei. It looks exactly like the CV 50/2.5 Skopar, which is extremely well built (chrome over brass) and with very similar design to the Summaron 35/2.8. I'd be surprised if the 40/2.8 was better made than the 50/2.5 and 28/3.5 Skopars. (Though I must note that the 35/2.5 Skopar in LTM is much more flimsy in construction than the 28mm and 50mm.)
The 40/2.8 Sonnar RF purchased new from Robert White had a build quality typical of CV, i.e. less than ZM and Leica. The focusing mount has a slight play and the rf focus needed minor tweeking for optimal sharpness, but I tend to be pickier than some. Fortunately DAG corrected both problems at a reasonable cost. Once properly adjusted, image quality is as good as anything I've tried from Leica.
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