There are not many posts (on pnet) about the Telyt-R 250mm f4 versions, and I am wondering what are the virtues (etc) of these lenses in real photographic use? The Hove Leica Pocket Book shows that the earlier model (11920) has a generally better perfomance than the later (11925) model, at least in Erwin Puts' view. Photos from Doug Herr and others show good out of focus rendering at close distances, but does this break down as the subject to background distance, etc, varies? Finally, the Pocket Book doesn't explicitly state that early version has a rotating tripod mount, but I assume that, logically, it must have? I already use a 180mm f4, so 250mm is not a really significant increase in subject magnification. However, as the first models are now really quite cheap, so I am tempted to complete my focal length coverage. The lens will be used only occasionally, mainly for landscapes, on a SL2 or R5/7: hence, an Apo-Telyt isn't an option. Any comments about the 250/4 Telyt and maybe how, or if, it pairs up with the 180/4 Elmar-R? Thanks.