A new-to-me N90s with MB-10 just arrived on my doorstep. I ran a new roll of
Fuji 200 Superia through it and as expected the results were fantastic, except
for one small issue - frames 19 and 20 overlapped.

The camera was set in "S" mode during this particular series of shots. Frame 19
was taken, then the camera was turned off and carried a few miles, then frame 20
was taken. Basically, the last 1/3rd of frame 19 overlaps with the first 1/3rd
of frame 20 - the rest of the roll carries on normally with good, even spacing
(some of it shot at the "H" drive setting.)

My wife shot frame 19, I shot frame 20, and I don't remember the camera acting
funny for frame 20, anyway.

I have checked the following:

-Made sure all of the teeth were present on all film rollers that have teeth
-Checked the pressure plate and film transport rollers for any grime or other
substance
-Pulled out a long-since expired roll of film that I'd never develop, and ran it
through the camera carefully on "S" mode. After each frame, wrote the frame
number squarely in the middle of the frame with a Sharpie. Looked at the whole
roll after this exercise and numbers were evenly spaced.
-Ran this "numbered" test roll through the camera a few times, spot-checking
where the number lands in the frame by opening the back and making sure the
number was correct re: the frame counter and that it was aligned in the center.
-Popped the bottom off the camera to see if I saw unusual dirt or wear, but
everything looks great.

Everything points to a "fluke" but I've never seen this with any of my other
Nikon bodies (although the only other ones from this era are a N70 and an F4s -
all others are older and non-internal motor). I'd hate to shoot this N90s and
miss an important shot because of this mystery overlap. What else can I look at?

-jb


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