On Thu, 24 Sep 1998, John Hermanson wrote:
|This can be the tip-off to a mis aligned mirror: sharp in the finder but out of
|focus on the negative.
It can also be a tip-off to an eye suffering from astigmatism,
speaking from personal experience. :-)
|Chris Barker wrote:
|
|> >Regarding miscellanious issues here is something I found out about my 85
|> >f2. I took it to a Giants ball game where we had nose bleed seats -- one
|> >row from the very top. I wanted to use my 85 instead of the 50 f1.8 because
|> >I "see" more like the 85. It was a bright, cloudless day and so very
|> >constrasty which makes focusing easy. I noticed with one lens(the 300mm
|> >f4.5) that infinity focus on the barrel is too far, i.e. out of focus. Now,
|> >I have learned from this august mailing list that this is not uncommon with
|> >long telephotos. But when I tried the 85 I was surprised!
|> >
|> >I couldn't turn the focusing ring far enough to get sharp(in focus) focus
|> >at infinity. I was using a screen with a split screen and could see that
|> >the image was not comletely lined up. And the image was ever so slightly
|> >fuzzy.
|> ...
|> >Andre
|> >San Carlos, CA
|> >USA
|>
|> Andre,
|>
|> Does this happen with any other lens? When I noticed this, mostly with the
|> 50/1.4 on my OM1N, I suspected the camera mirror for months (of course my
|> OM4 has built-in correction). Eventually, after many rolls with some
|> strangely unfocused photos, I was told at my annual medical that I had
|> astigmatism in my right eye.
|>
|> I now wear spectacles and the problem is no more (or I use an eyecup with a
|> correction lens installed).
|>
|> BTW, the OM Handbook states specifically that the 300/4.5 has a buffer at
|> the infinity end to allow for temperature changes, so you may reach
|> infinity before you get to the end.
|>
|> Hope that this helps
|>
|> Chris
|>
|> ____________________________________
|> Chris Barker <>< mailto:cmib@xxxxxxxxxxx
|> ~~~~~~~~~~~~~~~
|>
|>
|
|
|
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