part of frame unexposed, OM4Ti issues...

[valdas]

some time ago I posted a thread about my new old OM4Ti - I thought it had some issues with closing down the aperture of the lens, but it appeared it was lens needing the CLA.

however it is not the end of the story - I tested the camera with film and discovered that there is something wrong with either shutter or curtains, or... what happens is that when I shoot at high speed (e.g. 1/2000) the part of the frame is left unexposed. It only happens at high speed - 1/2000, maybe 1/1000, at longer exposures all is fine.

The seller has kindly agreed to take the camera back and refund me, however before I send it back just wanted to check on this forum what might be wrong with this camera? the example of the problem is below:

 

[rlouzan]

Shutter bounce, time for a CLA.

http://forum.manualfocus.org/viewtopic.php?id=16158

Regards,
Robert

 

[valdas]

Shutter bounce, time for a CLA.

http://forum.manualfocus.org/viewtopic.php?id=16158

Regards,
Robert

thanks, got it!

 

[Dwig]

Shutter bounce, time for a CLA.

http://forum.manualfocus.org/viewtopic.php?id=16158

Regards,
Robert

Yes, it's time for a CLA but...

... no, it's not shutter bounce.

Instead, it is the second curtain catching up with the first before the first finishes traveling across the frame. This is usually caused by the first curtain either traveling too slow or encountering some slowdown after traveling part way across. It produces underexposure, often to the point of no exposure, in the area at the end of its travel as seen in the OP's example.

Shutter bounce, on the other hand, is the second curtain bouncing back open after finishing its travel. This leads to overexposure along a strip along the image at the end of the shutter travel. Bounce can sometimes be cured with a CLA, but sometimes requires replacement of the shutter braking mechanism, something beyond a clean and adjust and something requiring the availability of the needed parts.

 

[rlouzan]

Hi Dwig,

You are right, I meant to say capping. Thanks for chatching my error🙂.

Regards,
Robert

Yes, it's time for a CLA but...

... no, it's not shutter bounce.

Instead, it is the second curtain catching up with the first before the first finishes traveling across the frame. This is usually caused by the first curtain either traveling too slow or encountering some slowdown after traveling part way across. It produces underexposure, often to the point of no exposure, in the area at the end of its travel as seen in the OP's example.

Shutter bounce, on the other hand, is the second curtain bouncing back open after finishing its travel. This leads to overexposure along a strip along the image at the end of the shutter travel. Bounce can sometimes be cured with a CLA, but sometimes requires replacement of the shutter braking mechanism, something beyond a clean and adjust and something requiring the availability of the needed parts.