Manually focusing on the wrong "sharp edge"?

Bob W pdml at web-options.com
Mon Jul 19 17:48:14 EDT 2010


> > > [...]
> > >> I'm curious if other people have this problem when manually
> > >> focusing, and what they do to fix it.
> > >>
> > >
> > > I always found it easier to use a plain matte screen, depending on
> > > which focal length I was using.
> >
> > Please explain how focal length affects it.
> >
> > Do you find the difference between in focus and out of focus too subtle
on
> a wider lens?
> >
> 
> I think he might mean that for longer focal lengths you are generally
using
> smaller maximum apertures and from what i understand and have observed,
> the split-image thingies tend to black out at anything above f4.  Really,
a plain
> matte screen is the best tool for manually focusing in my opinion
especially in
> low-light situations.

exactly so






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