Nikon F4: Quick fix for gummed mechanics parts?

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Andreas Thaler

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The still wet films hung to dry after bathing in the stabilizer.

The Portra 800 with orange mask is my test film from the F4.

The other is an XP-2 Super from the F3/T.

I can already say this much:
  • The new Bellini C-41 process works, a good replacement for the previous Tetenal Colortec.
  • The exposures look balanced across all 35 shots.
  • Exactly then after scanning and converting in SmartConvert.

 
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miha

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Thanks for the update. I can vouch fot the Bellini kits, E6 and C41, great products.
 
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Andreas Thaler

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The negatives from the Nikon F4 are correctly exposed, even at the small aperture values 👍



With this test I conclude the project.

Conclusion:
  • Using Zippo/Graphit as a mixture for injection I was able to make the aperture mechanism of the F4 working again to that extent that even the small apertures close completely.
  • I couldn't fix that the aperture closes with a slight delay.
  • The F4 obviously recognizes the deviation and corrects itself in aperture priority mode. If there is any deviation at all that matters.
  • The F4 should also do this in shutter priority and the two automatic programs, as the camera checks the exposure again immediately before opening the shutter. In manual mode, however, the delayed aperture opening could possibly have an effect.
  • Slight variations in exposure should not be a problem with negative film, which has a large exposure latitude.
  • Anyway the camera is fully operational again.
  • A complete repair of the gumming in the aperture mechanism would require removing the mirror box in 22 steps. A high risk.
 
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Andreas Thaler

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