Is there something wrong?

Discussion in 'Film Discussion and Q & A' started by nealjpage, Mar 24, 2008.

  1. nealjpage

    nealjpage multi format master in a film geek package

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    Here's a stupid question, but I've got to know: Can lenses, as they get older, lose their focusing ability? Case in point is my daily shooter, a Nikon FE with a Nikor 50mm f/1.4. While looking through the viewfinder, everything looks in focus. When I process my film, I come to learn that the focus is off. A few examples:

    [​IMG]

    This was shot a moderate aperture, around f/5.6 (I think..my notebook's in the car and I'm too lazy to get it) on Adox ART 25. Focus was on infinity. or there abouts. Clear and in-focus in the viewfinder.

    [​IMG]

    Similar situation. Adox 25, f/5.6ish, focus on infinity.

    What gives?:scratch:
     
  2. Sw1tchFX

    Sw1tchFX TPF Noob!

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    seems more like an error on the cameras part where the ground glass is.
     
  3. Battou

    Battou No longer a newbie, moving up!

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    I often find with my Canon FD 50mm 1.4 and EF focusing screen that infinity is always crystal clear in the fiew finder, how ever the split circle sais it is wrong and out of focus. I do what the center circle tells me is right and not the rest of the screen.

    Try backing off from infinity just a touch, You may be surpassing it.
     
  4. Garbz

    Garbz No longer a newbie, moving up!

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    In which case the camera needs to be recalibrated. For the record both switch and I have Nikon FEs too. And none of my equipment has had any problem ageing.

    I can only assume a knock or something has moved the mirror or the focusing screen so the distance from the mirror to the film plane is no longer the same as the distance to the focusing screen causing your discrepancy between the viewfinder focus and your actual focus.
     
  5. KevinDks

    KevinDks TPF Noob!

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    Perhaps I'm missing something, but at f/5.6 and with the focus on infinity, your depth of field extends from 48' 6" to infinity. Those sheds look like they are closer than 48'.

    Kevin
     
  6. compur

    compur No longer a newbie, moving up!

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    Why is focus on infinity?
     
  7. nealjpage

    nealjpage multi format master in a film geek package

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    Well, it was near infinity. That's when things looked focused. Maybe I need new glasses. :lol:
     
  8. Alpha

    Alpha Troll Extraordinaire

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    Glass can lose focus. Take it to a shop and have them fix it.
     
  9. compur

    compur No longer a newbie, moving up!

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    If you are judging focus only by viewing the overall image in the viewfinder,
    then any eyesight issue will affect your focus.

    I would check the lens by placing the camera on a tripod and focusing (using
    the focusing screen's focusing aid
    ) on a particular object at various distances.

    It's unusual that a 50mm f/1.4 Nikkor would have a focus problem if the lens
    appears in reasonably good condition and the focus adjustment moves
    smoothly with no evidence of mechanical problem. I've owned dozens of
    Nikkors and bought and sold many more and never had focus problems with
    any that had good appearance and smooth operation.

    And, since you are using a very slow film, I suspect that a slow shutter speed
    may be adding to the problem as well.
     
  10. christopher walrath

    christopher walrath No longer a newbie, moving up!

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    About every two or three years my images get soft and that's when I know it's time for another visit to Lenscrafters.
     
  11. Garbz

    Garbz No longer a newbie, moving up!

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    +
    Doesn't explain why the image looked fine in the viewfinder. Especially if he's correcting the image by adjusting the focus point. 3 years... Are they made of water? :lol:

    Yes but in the viewfinder it would be at f/1.4 unless the viewfinder is stopped down. In which case if the focusing aids say it's in focus then it's not the lens. Anyway a remotely competent camera repair man can determine this for you.
     
  12. Battou

    Battou No longer a newbie, moving up!

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    I believe he was refering to new specticles every two to three years.
     

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