Steve Spencer Offline Upload & Sell: On
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Jman13 wrote:
Any idea how this compares to the Contax G 90mm f/2.8? I've been using that as my compact 90mm (manual focus adapted) lens, and it's been wonderful, though the focus action is of course a little more clunky than a lens with a native focusing helicoid. From what I'm seeing, I think I'm probably better off sticking with my Contax, but I didn't know if you had experience with that lens.
Jordan,
I don't have the Contax G 90 f/2.8, but it is a very nice lens with no midzone dip according to the MTF at Zeiss.com that you can see here: https://www.zeiss.com/content/dam/consumer-products/downloads/historical-products/photography/contax-g/en/datasheet-zeiss-sonnar-2890-en.pdf
That said, the Zeiss ZM 85 has a noticeably better MTF graph, which you can find here: https://www.zeiss.com/content/dam/consumer-products/downloads/historical-products/photography/zm-lenses/en/datasheet-zeiss-zm-tele-tessar-485-en.pdf
The newer ZM lens has a bit higher performance at 40 lp/mm and a lot better performance on the tangential plane. Assuming those MTFs graph translate into performance difference the Zeiss ZM 85 f/4 should be a bit better than the Contax G 90 f/2.8.
In the earlier thread Rich (naturephoto1) did say he liked the new Voigtlander better than his Zeiss ZM 85 f/4 (https://www.fredmiranda.com/forum/topic/1723230/15#15792701) but I don't think he tested them side by side.
Trying to put all this together, my guess is that the Voigtlander will be a bit better than you Contax G 90 f/2.8, but perhaps not across the whole frame. The Voigtlander I think will be clearly better in the center and the corners (where he Contax G has a pretty big divergence stopped down between the sagittal and tangential planes), but in the midzone it will be a lot closer I would infer from Fred's tests which show some midzone weakness in the Voigtlander.
I plan to get the new Voigtlander and test it against the Leica M 90 f/4 Macro Elmar and I am planning to do those tests sometime towards the end of January in Columbus when I am next back there. If you wanted to get together to do them we could add you Contax G 90 f/2.8 to the tests. Let me know if you are interested in doing that.
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