Quote Originally Posted by Xia_Ke
It may very well not be the shutter. Could quite possibly be a developing issue like drg mentioned. I'm really not sure but, will be interesting to find out what it is. Couldn't hurt to post at RFF or APUG (sorrry PJ ). Have you put another roll through it yet to see if the problems shows again? Are the frames that the banding shows up on all together or are they scattered through out the roll?
I have another roll in the camera now, so I haven't had a chance to inspect the shutter blades. There are about 6 shots in 3 groups, that show the problem, and in every case, it's only visible in the clear sky. I'm not sure if it's present in other shots, but it could be obscured by a more detailed subject. I looked close and couldn't see anything, except in the sky (the 5 most recent shots on my flickr page are from the same roll). I guess flare is a possibility, but that seems unlikely due to the shape. I'll make sure to take a few shots of the clear sky on this current roll (Delta 400 at 1600 ), so if it's a camera problem, I should see it again.

Paul