Using infinity for mirror angle adjustment is fast and once done there is
really
no need to check anything else (focus at the film plane.) if focus does not
match there, it would indicate a problem with the flange/back measurement (lens
mount to film plane) not the mirror angle.
John
Shawn Wright wrote:
> On 28 Sep 98 at 11:00, John Hermanson wrote:
>
> > An easier test might be just to use something on the horizon (or
> > infinity). Of course this must be done with a lens that you know is
> > calibrated properly for infinity.
> > If those are sharp, everything else in between will be too.
> >
> I just assumed using something near the close focus limit would be more
> critical due to the limited DOF. Is there a problem with this method that I'm
> not considering? Should I also check the infinity focus?
>
> I should know in the next few days if the mirror "shim" has improved focus in
> close up shots.
>
> Thanks.
> ========================
> Shawn Wright
> Computer Systems Manager
> Shawnigan Lake School
> 250-743-6240
> swright@xxxxxxxxx
>
>
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