Simple - the faster you go, the shallower the depth-of-field. In low light,
you are more likely to be shooting wide open and, with the f1.2, the DOF
can be horribly shallow. Easy to make an error. I'm struggling with this
myself, right now, with the 1.2. Had a lovely profile shot of a young woman
- but the point of focus was on the neck, not the eye which was just one or
two inches closer. Damn!
AndrewF
>I have two fast OM lenses, the 50/1.2 and 100/2 that are fairly new to me...
>While shooting with them over the last few months, I have noticed that they
>seem harder to focus than the 50/3.5 or 100/2.8 in low contrast
>situations... (Example: trying to focus at a certain point on a field of
>grass while it is cloudy...)
>
>While they are brighter, I am a bit stumped as to why they are harder to
>focus in certain conditions.
>
>Any ideas?
>
>Thanks, James.
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