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List Info
Thread: Focus adjustment
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| Focus adjustment |
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2006-01-28 01:32:51 |
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I am using the glass mount and have not had any problems at all with
focus. In fact, I have found the point of focus to be very precise,
resulting in scans of great apparent sharpness even without any
unsharp mask. And I am simply focusing on the negative, not with a
special template.
Sounds like to me something could be wrong with the settings of your
Leaf?
Sandy
--- In Leafscan@yahoogroups.com, "msellers1" <msellers1 s...> wrote:
>
> John,
>; Thanks for your input.I am using the glass mount from Burney so
the film plane is higher than normal which seems to be throwing off
my focus point.
> ----- Original Message -----
> From: johnl002
> To: Leafscan@yahoogroups.com
> Sent: Friday, January 27, 2006 11:24 AM
> Subject: [Leafscan] Re: Focus adjustment
>
>
> --- In Leafscan@yahoogroups.com, "leicamike2000"
<msellers1s...> wrote:
> >
> ; > I am not satisfied with the sharpness of the focus when at
4.7.It
> > seems soft.I can stop down to f8 but I am getting scan times
in the
> > one hour range.Is there some way to adjust or re-calibrate the
focus
> > point?
> > Mike
> ; >
>
>
> Mike,
>;
> I agree with others' comments about focus, optimal apertures,
post-scan
> usm, etc. My own tests show that stopping down also increases
the
> resolution away from the image center, especially scanning 4x5's
in
> landscape orientation. It's better when scanning 4x5's in
portrait
> orientation and smaller film sizes, but you have to put up with
the
> longer scan times with the smaller apertures.
>
> I've settled on F5.6 for 35mm, f8 for 2-1/4, and f11 for 4x5,
and yep,
> rather long scan times are a result. But in my workflow, these
> apertures provide a good compromise between resolution across
the image
> and scan times.
>
> Also, depending on how much of the film area is to be used, I'll
also
> employ a sort of vignetting mask to apply a little extra usm
away from
> the image center to help compensate for that inherent lens
resolution
> fall-off toward the image edges.
>
> My 2 cents....
>
> John
>
>
>
>
>
>
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