Bad eyes, diopter?

I have diabetic neuropathy in my optic nerves, which is sugar crystals in there
and that messes-up eyesight. But glasses do work fine to correct my vision.
I seem to notice that my images (35 slides) look sharp under a loupe, then I
scan them and they come up fuzzy! My older 6x7 positives are alright, but not
my recent 35s, and I take time focusing.
Maybe I am getting bloom in scanning from overdone settings in Vuescan?
Overworking the CCD? Settings too intense?
Or maybe I am focusing the lens to the wrong length, using the lens as like my
eye glasses, or in another term; focusing to the same prescription of my
glasses, and therefore the images are a bit fuzzy? Is that exactly what diopters
are for?
If so I need a -1.25 for my Pentax K2 and I don't know where to find one.
I would appreciate any positive advise, please.
TIA,
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AAvK

Re: Bad eyes, diopter?

Thanks Mr. Browne, I will order one from the local shop. Wish they had
my exact prescript though.
AAvK

AAvK

Re: Bad eyes, diopter?

Never listen to a nurse. Only the doctor.
Nope.
AAvK

AAvK

Re: Bad eyes, diopter?

That's not the neuropathy - means dead nerves from the Latin or Greek -
it's a one-way process. Eyesight doesn't usually go fuzzy until your
blood sugar is way too high.
2700 should capture standard 35mm film adequately so maybe the scanner
is out of focus - can you fix that?

Stephen

Re: Bad eyes, diopter?

If you're manually focusssing with glasses (-1.25) and get good results
and getting fuzzy results w/o glasses, then yes, a diopter is the thing
to add to the VF. Shooting with glasses sucks.
As an exercise, focus on something w/o glasses. Then put them on and
look through the VF... that should tell you the story quite quickly.
Try b&h photo.
Most new mid to high end cameras have a diopter setting built in (-3 to
+1 is typical).
G'luck,
Alan
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Alan Browne

Re: Bad eyes, diopter?

That makes sense, because I know the neuropathy goes up and down, as
sugar levels goes up and down. Therefore levels of fuzzy eyesight does
go up and down.
In Vuescan it's whatever gives me a final 300ppi, though I think I should
try for 400ppi, but that can be done in Genuine Fractals which has got to be
a much better up-sizer.
I use the slider to set "scan dpi" related to final dimension settings. The
scanner's highest is 2700 ppi, though it will interpolate to higher. It is a
35mm only scanner, the old 2720s by Acer/BenQ, now owned by Umax.
--
}<)))*> Giant_Alex
cravdraa_at-yahoo_dot-com
not my site: http://www.e-sword.net/

AAvK

Re: Bad eyes, diopter?

That's because you have other eyesight problems than the neuropathy,
although if your blood sugar is too high it does affect the focal length
of your eye temporarily - the neuropathy has different symptoms though.
This suggests to me that your scanner is out of focus - although it
depends on what scale you're looking at the image - ALL digital images
have a point where they look "fuzzy" when you're approaching the
resolution of the scanner. 35mm film should support better than 3000 dpi
- what are you scanning at?