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Old 05-05-2011, 12:55 PM
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bojan
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Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 6,932
Quote:
Originally Posted by koputai View Post
I think I've found the problem.

The rear element and it's holder in the back of the lens are wobbly.
I set up an artifical star and shot down the hallway. What was strange
was that the abberation stayed in the vertical plane no matter which
way up I held the camera. This made me think the was glass moving
due to gravity. On inspection yep, the rear element is flopping about.
It doesn't unscrew or screw up though, so I'm not sure what is loose.
I think I'll break out the little screwdrivers and pull it apart.

Thanks for all your ideas guys, much appreciated.

Cheers,
Jason.
Excellent !!
Good thinking mate, that's it.
Sometimes the last element (in it's cell) is centred by grab-screws.
Maybe retaining ring (inner side of cell) is loose .

Last edited by bojan; 05-05-2011 at 01:06 PM.
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