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  1. #1

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    Nikon F4 doesn't seem to stop lens down completely

    I got a Nikon F4 in the mail today, woohoo. The thing is a tank, I'm already in love with it. There seems to be an issue, though. When the shutter is fired it doesn't stop the lens down completely. When the lens is set to f22 it only stops down to about

    Here.
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    If the DoF preview button is pressed, it stops down to f22 as it should, but then it still doesn't quite get there when the shutter is fired. I know its not the lens, either, as the lens works just fine on my F/FM10. I tried another lens and the same thing happened. Any idea whats up here? Should I just try to ship it back and try to get a different camera?

    Maybe I should've gone with the F3, hm.

    Thanks a ton!

  2. #2

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    Any chance you have it set on a program mode (P or Ph)? Make sure the mode selector is on "M."

  3. #3

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    Yep, definitely on M mode.

  4. #4
    rthomas's Avatar
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    Try it with a different lens, if possible. If the issue happens with more than one lens, it's almost certainly the body. I had this problem with an F4 once. As I recall, mine made a squeaking noise when I pressed the DOF lever, which was not normal. Lenses did not stop down completely and the camera needed a repair to the aperture lever. Since it was still under the return period I swapped it for another one.

    EDIT- I see you already tried a different lens, missed that on the first read.

  5. #5

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    Chances are your aperture mechanism is thrashed; you can perhaps get a look at what's going on by watching the stop down lever move when the lens is off. If you can send it back, that's your best bet; don't write the F4 off, though, I've seen every F series camera get to some level of non-functionality after professional (ab)use.

  6. #6
    clayne's Avatar
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    Yep. Examine the stop down mechanism. Since these things are simple mechanical (yay!) assemblies they're usually repairable - provided you can figure out what the issue is.
    Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.

    http://www.flickr.com/kediwah

  7. #7

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    F4's are virtually bomb proof. Possible in need of a good service though considering the age, and I bet if you do service it, that will be the 1st it has had..

  8. #8
    jp498's Avatar
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    If it's an older lens, you may have to set the lens to 5.6 and then put it on.

    Make sure the lever inside that moves the aperture slider on the lens is not bent. I had that happen once somehow. Also make sure the meter coupling tab is in the right position for the lens.

  9. #9
    clayne's Avatar
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    I'd also agree that this camera is a virtually indestructible brick. There's gotta be a tangible reason why the behavior is present.
    Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.

    http://www.flickr.com/kediwah

  10. #10

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    It's one of the four DC motors that the F4 uses, the one that charges the aperture lever AND one cycle of set of shutter blades.

    I've had this happen twice to one body, fixed once, and once to another body. Still awaiting diversion of repair budget on that one.

    Funny enough, my former shooting partner with two F4 with nearly same amount of wear (5-7 years of hard wedding use) it has not happened.

    I attribute this to my use of Continuous High motor setting *every time* and her use of Single *every time*.

    As I know it and you can search it, the stepping of the motors is different in S, Cs, CL and Ch.

    I'm certain that my constant use of Ch has led to this.

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