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[OM] Re: focus and ? about lens filters

Subject: [OM] Re: focus and ? about lens filters
From: Ali Shah <alizookoman@xxxxxxxxx>
Date: Tue, 8 Jan 2008 07:55:56 -0800 (PST)
Basic UV filter. Go with BW or higher end Hoya.


--- Amin Sabet <asabet@xxxxxxxxx> wrote:

> 
> 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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