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Re: [OM] Calibrating the OM4 diopter for glasses/eye fatigue?

Subject: Re: [OM] Calibrating the OM4 diopter for glasses/eye fatigue?
From: "John A. Lind" <jlind@xxxxxxxxxxxx>
Date: Tue, 08 Apr 2003 23:43:53 -0400
Provided you don't need significant astigmatism correction, you should be adjusting and using the OM-3[ti]/OM-4[T] viewfinder dioptric correction *without* corrective lenses. That's the whole point of having the adjustment. For other bodies, correction worn or used, either on the eye or the viewfinder should be for "distance" viewing. The viewfinder is designed optically to effectively put the focusing screen several feet in front of the eye.

To set the dioptric correction:
1.  Take off glasses
2.  Remove lens from body
3.  Look through viewfinder
4.  Adjust correction and center it for sharpest viewfinder display.
5. Put lens back on and verify setting by focusing on a good contrast edge using the micro-prism ring around the center spot (1-13 or 2-13 screen have this ring). Focus should be fairly clear and dramatic with the contrast edge looking jagged (following the microprism pattern) even when slightly out of focus.

-- John

At 20:30 4/8/03, Alex asked:
Hi Folks,

Last year, I went on a photo tour that was really intense in terms of shooting, I shot over 50 rolls of film most being with the OM4, but also a MF RF as well. Toward the end of the tour, my right eye became so exhausted, I had to switch to the left for shots. Not, only do I wear glasses, but they are progressive as well. Prior to the tour, I had never experienced this before! My question is, for those who wear glasses (particularly progressives), how do your OM4 (or 3) diopter correction for minimal eye fatigue? Possible, it might be a good aidea to not use progressives, but a particlar single vision lenses optimized for a distance X? Or am I asking the impossible and should consider AF for the next heavy shooting foray?

Thanks.

Alex




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