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I had two rolls of film come back from the lab looking like this. The

white spots shown below appear on all of the frames on the film at

the same position. The equipment was a Mamiya RZ67 with a 65mm lens,

220 back and a strobe. The strobe was triggered from the lens.<br>

Could it have possibly been the lab?<br><br>

<img src="http://elaisted.com/ljprev/beach-damaged-frame-2.jpg">

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I don't think it was a lab problem. If light streaks or bands are caused by processing they would reach across the spaces between frames. The lower light streak reaches to the edge of the frame but is not visible on the space (left).

 

Reddish spots in most cases are caused by light leaks behind the film. Slide film (I think you used this) has an orange filter layer which is washed out during processing. Any light coming from the back of the film will cause orange/red spots.

 

The lower light streak might be caused by "banding" (improper movement) of the shutter curtains (check the direction of the shutter curtains), or reflections inside the camera body.

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This is easy. Had the same problem (though more severe) with one of my backs. See how the lighter area extends onto the edge of the film? This means it's a light leak that was caused by light entering the back from the side or above while the film was not moving (so it comes out pretty sharp and defined). See <b><a href="http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00EXWD">this thread</a></b> for more info and an easy solution. Or use duct tape.
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Thank you everyone so far who has given me some input on this. For those of you that mentioned the problem being a possible shutter curtain problem; the Mamiya RZ 67 doesn't have a shutter curtain. I have one of those light seal replacement kits so I'm considering replacing the seals in the back and testing it out when I have some time.
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Kevin, a quick and dirty fix is to simply put a strip of duct take on the side with hinge of the back. This is usually where the light seals are weakest and break down first. At least this was the case with my back and the duct tape worked fine.
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