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F4 Focus Problems...Advice Most Welcome


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zhemgang Registered since 07th Jun 2006
Sat 17-Nov-07 10:30 PM

I bought a used F4 a while back. I had a problem with the MB-20 battery supply in that after taking a shot the red alert light would flash and I would then have to turn it off and on before it would fire again. This would not happen with the MB-23 power supply. I even sent it to Nikon NJ for a CLA and to check the alert light issue and it was returned after some cryptic repair explanation. But two things appear to be still happening:

1) When I try and focus using any lens, the split prism never aligns perfectly regardless of the lens used though the green light comes on.

2) When test firing (without film) in P and S modes the red alert light comes on after each shot. In A mode this doesn't happen. This happens using either the MB-20 or MB-23 power packs.

Is there any reason that the power pack would cause any of these problems. Are there an adjustments that I can make to the focus? Should I bother sending it in for repair again? I would really like to use this camera and am rather disappointed.

Thanks for you advice,