Samuli Vahonen Offline Upload & Sell: Off
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Samuli Vahonen wrote about C/Y Sonnar 2.8/135 some weeks ago from this thread:
I would never consider this lens for landscapes, but I did enjoy it quite much for my normal boke-shooting, but also in this "application" the CA gets to my nervers (not the focus plane CA, but front/behind magenta/green edges). So one has to choose scenes carefully with this lens. I got the lens during wintertime and I still remember the disappointment.
I think I was too quick to judge Contax/Yashica mount Sonnar T* 2.8/135. I have been now shooting with it few times and I'm pretty happy to results. I used PhotoShop on few images, please read descriptions and do not assume lens itself could produce results like below (few boke images I combined f/8 and f/2.8). All images I used Adobe Camera RAW option to reduce CA (checkbox on lens tab). Hexaconal boke highlights are awful - in many scenes the background boke turns pretty ugly at any other aperture than f/2.8. Wide open boke is always extreme good (personal opinion).
Naturally this is no competition to Carl Zeiss APO-Sonnar T* 2/135 ZE/ZF, what is my usual tool for 135mm focal length - but for price this could be good option to get old Zeiss look to tele images, specially if one is prepared to do some postprocessing as well.

Carl Zeiss Sonnar T* 2.8/135 CY @ f/2.8, 1/800s, ILCE-7 @ ISO 160 - I would have hoped Zeiss would have optimized shorter distances, but they did optimize infinity (as always), I used f/2.8 to blur foreground field more, but it seems focus plane quality is sufficient and shallow DOF gives nice pop to subject (subjective opinion).

Carl Zeiss Sonnar T* 2.8/135 CY @ f/11.0, 1.3s, ILCE-7 @ ISO 200, B+W 58 KSM C-POL MRC

Carl Zeiss Sonnar T* 2.8/135 CY @ f/8.0, 0.3s, ILCE-7 @ ISO 160, B+W 55 CIRCULAR - POL

Carl Zeiss Sonnar T* 2.8/135 CY @ f/2.8, 1/5s, ILCE-7 @ ISO 80, B+W 55 CIRCULAR - POL - NOTICE! PhotoShop used: f/2.8 DOF was not enough and I didn't like the f/8 boke -> I combined f/8 large DOF to f/2.8 smooth boke in PhotoShop.

Carl Zeiss Sonnar T* 2.8/135 CY @ f/8.0, 1/60s, ILCE-7 @ ISO 160, B+W 55 CIRCULAR - POL

Carl Zeiss Sonnar T* 2.8/135 CY @ f/8.0, 1/13s, ILCE-7 @ ISO 160, B+W 55 CIRCULAR - POL - this was to test foreground boke and I like it, specially the edges of foreground object against background.

Carl Zeiss Sonnar T* 2.8/135 CY @ f/2.8, 1/10s, ILCE-7 @ ISO 80, B+W 55 CIRCULAR - POL - NOTICE! PhotoShop used: f/2.8 DOF was not enough and I didn't like the f/8 boke -> I combined f/8 large DOF to f/2.8 smooth boke in PhotoShop.

Carl Zeiss Sonnar T* 2.8/135 CY @ f/2.8, 1/15s, ILCE-7 @ ISO 80, B+W 55 CIRCULAR - POL - NOTICE! PhotoShop used: f/2.8 did not have enough microcontrast on focus plane to make the shot to work -> I combined f/8 large microcontrast to f/2.8 smooth boke in PhotoShop.
Samuli
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