Leica 180mm… F2.0 vs. 2.8

[telyt]

Well I see less chromatic aberration with the 250 than with the 350.

There's much more to the comparison than chromatic aberration.  IIRC on another forum you didn't even see the spherochromatic aberration in the 560mm f/6.8 Telyt that I pointed out in one of your photos.

[melchiorpavone]

There's much more to the comparison than chromatic aberration.  

Yes, I know that. Here is a page of photos taken with the 250:

https://www.flickr.com/photos/yoyo31/sets/72157625042549743/

My point is that I can see more chromatic aberration with the 350 than with the 250. The overall image quality of the 250 is higher, but that does not mean the 350 is a bad lens. It is a very good lens. The 280 APO is a superb lens. I am not sure whether there is a 1.4 APO teleconverter for the SL2 mount. Maybe you know. There were separate R and SL teleconverters, if I recall correctly. I have never used teleconverters.

The 250 is an excellent lens, the 280 APO is a superb lens, and the 350 is a very good lens. But they are all of different focal lengths and prices: you are not comparing apples to apples.

[telyt]

I am not sure whether there is a 1.4 APO teleconverter for the SL2 mount.

There is only one version of the 1.4x APO-Extender-R.  As originally built it would not fit the Leicaflexes but a simple camera-end flange change fixed that problem.  Auto-diaphragm still works, stop-down metering required on the SL and SL2, hand-held light meter or other means of determining exposure required with the original Leicaflex.  It does not work with the 350 as originally built but I modified my 350 so it would fit.  It was not worth the effort.

[melchiorpavone]

There is only one version of the 1.4x APO-Extender-R.  As originally built it would not fit the Leicaflexes but a simple camera-end flange change fixed that problem.  Auto-diaphragm still works, stop-down metering required on the SL and SL2, hand-held light meter or other means of determining exposure required with the original Leicaflex.  It does not work with the 350 as originally built but I modified my 350 so it would fit.  It was not worth the effort.

Well if I really wanted a teleconverter for that lens I would get an R camera then. As things stand, I would not do that, though I might try to get one of the 280 APO lenses. I have 180, 250, 350, 560mm lenses, and these are quite sufficient as things stand.

Here is a near-mint 350 for sale:

http://www.ebay.com/itm/Leitz-Leica-Telyt-Lens-350-4-8-in-Original-Box-Made-in-Germany-/231339738086?pt=Camera_Lenses&hash=item35dcec43e6