The little tab (on some models with spring sticking out) that the mirror
rests on is the only thing that determines mirror angle. Tab can bend
quite easily, as when a camera is impacted just the right way. Or
someone puts finger on edge of mirror and pushes down. Then all focus
would be off all the time (mostly good in finder, bad on film, infinity
way out). I've also seen a few bodies where the screw that secures the
mirror angle tab was loose.
John
Camtech
On 8/28/2006 10:54:17 AM, Chuck Norcutt (chucknorcutt@xxxxxxxxxxx) wrote:
> What can cause the mirror angle to be off?
>
> Chuck Norcutt
>
> John Hermanson wrote:
>
> > Maybe your focus screen was partially unlatched. I've seen a few Beattie
> > screens where the tab was in the wrong place so you ended up mounting
> > the screen upside down. That would throw focus off with all lenses all
> > the time. If mirror angle has changed that would affect infinity focus
> > with all lenses (sharp in finder, focus scale way off, infinity comes in
> > early or not at all) would be out of focus on film.
>
>
>
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