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| Re: Zeiss 135mm f/2 Apo Sonnar vs Canon EF 135mm f/2L |
Sounds tricky, but with practice it is quick and easy with the well damped long throw focus ring.
It would be interesting to test this process. If the focus point is already selected and on contrast, the 135/2 takes 2/3 of a second to run through the entire distance scale. More often, it'll be ready to fire in less than half a second. Lenstip measured 97% accuracy in the studio; field shooting is probably closer to 85% with the rest near-misses. How long does it take you to shoot manually without a custom screen and what percentage of your shots are in-focus?
Difficult to quantify this. Obviously the 135 L is blisteringly fast and accurate. With mf you will not be shooting sports or BIF, but I'd say the focusing accuracy would be similar.
Some old samples of hyperactive kids from 100 f/2 MP W/O:
All are critically focused.
That said, I concede it may be be harder to focus the 135 APO compared to the 100MP.