The rest stud is the adjustment for the 45 degree mirror angle. Best test
for this is using a lens known to be adjusted properly for infinity, then
focus on the horizon. If the horizon is sharp at infinity, then the mirror
angle is correct.
John Hermanson
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----- Original Message -----
From: "Chip Stratton" <cstrat@xxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, May 08, 2001 10:36 PM
Subject: RE: [OM] Gary's lens test...
| I had an OM-PC which was off because of a bent mirror rest stud. I've
| checked several of my other bodies to be sure. Put your fast 50mm or 90/2
on
| the body, put a yardstick under it with the 0 at the film plane, and
| carefully focus down the stick on something like the 2 foot mark -
| preferably at a distance marked on the lens focus ring. Take a picture,
and
| note what you were focused on, and note wheter it agrees with the focusing
| ring distance. When you get the image back, it should be pretty clear
where
| the center of your focus really is, and how much it might be off.
|
| Its an easy test, and answers many questions.
|
| Chip Stratton
| cstrat@xxxxxxxxx
|
| > You know, I had the same problem with a 50/1.2 shot wide open one day.
I
| > took some BEAUTIFUL portraits of my family with window light, but
| > EVERY one
| > was about 2-3" off focus, which effectively ruined them all. I know my
| > eyes are failing a bit, but every shot? Geez.
| >
| > I'd love to hear other stories and/or solutions.
| >
| > Can an SLR get out of focus calibration? (I know my rangefinders
| > can do this.)
| >
|
|
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