You can also check by exposing film at different speeds, adjusting the
aperture to maintain exposure. Slide film is better but by looking at the
negative, not the prints, you can easily detect gross errors, such as you
suspect, in shutter speed.
Nice explanation of the mechanism, Moose.
Gary Edwards
www.peopleplacesflight.com
> -----Original Message-----
> From: owner-olympus@xxxxxxxxxxxxxxx
> [mailto:owner-olympus@xxxxxxxxxxxxxxx]On Behalf Of Moose
> Sent: Sunday, December 07, 2003 7:58 PM
> To: olympus@xxxxxxxxxxxxxxx
> Subject: Re: [OM] OM-1 Shutter speed problem
>
>
> All speeds from 1/60 to 1/1000 should sound the same, as the mirror is
> up the same time for all of them. The curtains travel at the same speed
> not matter what the speed and from 1/60 on up the second curtain is
> released as or before the first completes its travel, so it all sounds
> the same. With these upper speeds, you can check if they are in fact
> different by looking through the camera with lens off and back open/off
> at a TV or computer monitor. The odd image you see will be slightly
> different at different speeds.
>
> The speeds below 1/30 should each take progressively longer, pretty
> obvious both from sound and by how long the viewfinder blacks out. There
> are 3 different mechanical escapement mechanisms in the camera to cover
> the whole range of speeds, so one range can be off and the others on.
>
> If the speeds are in fact all the same, there is no user solution, it
> must be repaired by a pro.
>
> Moose
>
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