I don't have any tips for you but will just comment that the reason for
the focusing difficulty is that, even as close as 12 feet, the DOF for a
24/2 is quite large, extending from 8.5 to 20.7 feet. Even cutting the
conventional 8X CoC in half to allow a 16X enlargement the DOF still
runs from 9.9 to 15.2 feet.
Well, maybe this does count as a tip. If you're actually shooting not
at f/2 but at a middle aperture like f/5.6 or f/8 the DOF is so great
you might just as well set the lens at the hyperfocal distance and
forget about focusing. The hyperfocal distance at f/5.6 is 10.2 feet,
f/8 is 7.2 feet and f/11 is 5.2 feet. You can literally just set it and
forget it but if you're going to shoot like that all night I find it
useful to tape the focus ring in place.
The only other thing that I can think of is to pick an object about the
same distance away as your subject but one which may be more brightly
lit and has stronger contrast. Given the wide DOF, the actual distance
to the focusing target vs. the real target need only be in the ballpark.
Chuck Norcutt
Amin Sabet wrote:
> Well I just mounted the OM 24/2 for the first time, and it's tough for
> me to get a sense of focus with this lens compared to the 50,
> especially with somewhat more distant objects in low light. Not such
> a big deal I suppose, since I'll probably zone focus more often than
> not when quick focusing is necessary. Anyone have any tricks to share
> for focusing this lens at f/2 on subjects12-20 feet away =) ?
>
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