It is not a contrast issue. I am basing my focus on the split image
on the 1-13 screen and using the varimagni finder at 2.5X. This has
been my standard method for evaluating lens focus. It is an
extremely small error, and it would not be noticeable by focusing on
the matte area and no magnified finder. My view through the finder
looks sharp and of normal contrast. If it is slightly low contrast,
that will not be a problem for astrophotography. The 50mm wide open
apeture is what I need for light gathering ability for faint stars.
--- Moose <olymoose@xxxxxxxxxxxxx> wrote:
> This is not a particularly sterling example of the lens makers'
> art.
> Take a look at Gary's tests and you will see ratings of 'C' at f1.2
> and
> "Moderately low contrast images at f/1.2". That may actually be
> part of
> the focus problem, the camera focuses wide open and the lens gives
> a
> fuzzy, low contrast image clearly wide open.
>
> Moose
>
> Lama-Jim L'Hommedieu wrote:
>
> >If you spend all that money, you get a lens that's too overbred to
> focus accurately but it's not so bad at 2.8. Hmmm....
> >
>
>
>
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