Question about Nikon Normal AF Nikkor 50mm f/1.8D Autofocus Lens

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Nikkor 50 1.8 overexposes

In manual mode (on a D80 camera ) i always get the first picture out of focus and overexposed 2 or 3 stops, (practically it burns out everything )
if i keep the focus, folowing pictures are exposed corectly.
i took the lens to be cleaned iniside but the problem remains.

Thank you

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  • lup_alb Feb 15, 2009

    yes, it had oil on the aperture (from the previous owner) i had it cleaned and it returend looking good and reacting fast on aperture (tested it using that metal lever from the objective's mount)

    i tested it on 1.8 more and it seems not to overexpose hmmmmm

    its problem also seems tobe somehow related with focus, if i mentain focus and do 3 pictures in a row, only the first one is burned out

  • lup_alb Feb 15, 2009

    yes, it had some oil on the blades (from the previous owner) . i had it cleaned and it returned (at least aparantley) loooking good and clean. aperture seems to be working fast ( tested using the metal lever from the lens's mount )
    still, i tested it more on 1.8 as you sugested and it doesent seem to have problems on that aperture hmmm

    problem seems to be related with the focus also .....
    if i keep te focus and do 3 pictures in a row first one is burned but the rest are ok; if i change the focus *even for a bit, i starts again doing the first picture overexposed




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You probably have oils on the aperture blades and they do not close to the F stop you set as quickly as required, thus causing the over exposure. Easy to pinpoint: sent the aperture to full open (F1.8) and use appropriate shutter speeds as determined by the camera (in manual mode), if the picture does not over expose, then the problem is with the oiled contaminated aperture blades. Have it cleaned.

Posted on Feb 15, 2009

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