Yes, the 20mm f1.7 is a nice one indeed but the selective focus crowd
would like a stop or more faster for more flexible dof control.
DOF equivalence is about F 3.4 on FF. Not as impressive when viewed
from that perspective. Dr. Focus and AG have calculated the exact
dof difference, but 2 stops is close enough for gov't work.
Mike
> 0.95 is pretty spectacular - the fastest available by anyone.
> I'm more concerned by the rather lousy looking bokeh. I think this is
> one for movie use where the criteria for sharpness and out-of-focus
> rendition are less important than some other characteristics, such as
> DOF control.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 03/03/2010, at 5:10 PM, Nathan Wajsman wrote:
>
>> But there is already a fast prime, the excellent 1.7/20mm. Not
>> Noctilux fast, granted, but 1.7 is still pretty fast.
--
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