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Re: [OM] Shutter Tapering

Subject: Re: [OM] Shutter Tapering
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Fri, 6 Apr 2001 17:58:10 -0400
To show variations in curtain speed, many shutter testers have 3 sensors,
opening side, middle and closing side.

John  Hermanson
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http://www.zuiko.com
Camtech, Olympus Service since 1977.
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----- Original Message -----
From: <Johnsonpa@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, April 06, 2001 2:39 PM
Subject: Re: [OM] Shutter Tapering


| Kelton wrote about tapering and testing with a single sensor shutter
tester:
| "Hmm. Is it possible to move the single sensor left and right within the
| shutter opening to read both sides of the shutter with a single sensor?
| Or do these sensors not allow left/right movement? (Considering the
| purchase of a tester as found at http://www.homestead.com/cameratester/
| or a similar one found at www.micro-tools.com). What sort of shutter
| tester do you use?"
|
| Yes, I can move mine to the left and right, but there is time variation in
| every shot.  Therefore, I would think a person would have to shoot maybe a
| hundred shots in each location to gain significance.  It might also help
to
| affix some sort of system whereby the location of the sensor is
predictably
| in the same location.  I checked out your link first link and that is much
| fancier than what I have.  I went with the $80 cheapo from Calumet.
|
| I imagine some of the pro repairmen on the list could better answer the
| question, though.
| --p.j.
|


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