Chuck thanks for the information. I will certainly try to make use of
the hyperfocal when possible. Looking for other high contrast objects
is another good idea.
While I'm asking noob questions, here's one more - With my Canon DSLR
lenses, I never use filters. However, with these "jewel-like" Zuikos,
I feel compelled to protect them. Also, with film I'm not sure
whether I need to have a UV filter even if the lens is multicoated.
Can anyone recommend a good type of filter to leave on all the time?
Thanks, Amin
On Jan 8, 2008 7:58 AM, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> 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
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