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Focus problem

Discussion in 'Adapted Lenses' started by Deadbear77, Nov 30, 2012.

  1. Deadbear77

    Deadbear77 TalkEmount Hall of Famer

    Sep 14, 2012
    Northeast Ohio
    Kevin
    So I've been using a bunch of different minolta and off brand md/mc mount lens on my nex 5n.

    If noticed that some if not most of my zoom and fixed lens have problems focusing to infinity.

    I've tried 3 different adapters from 3 different company's.

    Do you think it's the camera?
     
  2. Bugleone

    Bugleone TalkEmount Veteran

    210
    Aug 21, 2011
    You do get differences between various lenses, even those of the same manufacturer, and also diferences in adaptors.......

    However, if you have the same problems regardless of lens/adaptor, then suspect 'error between teh ears of the operator'.....

    .......the NEX is not likely to be wrong and is, anyway, easily checked. Manual focus is NOT as straightforward for all users and definately requires (and improves with) practice. Are you sure it's a focus fault?.....not slight camera movement as this can look like slight poor focus.
     
  3. Deadbear77

    Deadbear77 TalkEmount Hall of Famer

    Sep 14, 2012
    Northeast Ohio
    Kevin
    After looking at it more it looks as if most of my lens focus at the almost to infinity. All the way is blurred but slightly turned is not. I think I just need to stop down a bit more. I think I'm expecting too much.
     
  4. Bugleone

    Bugleone TalkEmount Veteran

    210
    Aug 21, 2011
    Well a few other things come to mind;.....what are you using as an 'infinity target'..? A large aperture is normally MUCH better for focusing and determining focus faults,..that said, most lenses give a sharper image when stopped down two stops....
     
  5. Deadbear77

    Deadbear77 TalkEmount Hall of Famer

    Sep 14, 2012
    Northeast Ohio
    Kevin
    Actually I use the moon as an infinity target to test my lenses at night just to make sure that they're working correct
    I also have the EVF viewfinder that I use with it
     
  6. Deadbear77

    Deadbear77 TalkEmount Hall of Famer

    Sep 14, 2012
    Northeast Ohio
    Kevin
    This lens focuses at the infinity point perfectly nuje7epu.
     
  7. Luckypenguin

    Luckypenguin TalkEmount Regular

    110
    Sep 26, 2012
    Brisbane, Australia
    Nic
    So it's not that your lenses can't focus to infinity, but that they can focus beyond it. Just about every lens adapter that I have used was constructed slightly too short. With the construction tolerances of the cheaper adapters being what they are, this ensures that you'll never have an issue where you can't focus a lens to infinity but it does mean that you can't just rotate the focus ring all the way out to infinity when shooting a distant target.
     
  8. Deadbear77

    Deadbear77 TalkEmount Hall of Famer

    Sep 14, 2012
    Northeast Ohio
    Kevin
    Ok. That makes me feel better, on another note. I just purchased a vivitar 28/210 and it does not focus at all for me. The lens seems in almost brand new shape as it came with box and papers and all that. Just can't get a single shot in focus.
     
  9. Dioptrick

    Dioptrick TalkEmount All-Pro

    Feb 4, 2012
    New Zealand
    Yep, Nic was spot on with the infinity focus problem. With adapted legacies we can't always use the end stop of the barrel movement as an infinity guide especially at wide open apertures.

    The Vivitar 28/210 is obviously at fault since all your other legacies work on our camera.

    Give us more info...
    1) It doesn't focus only at infinity, or all the time at every distance?
    2) Does the focusing problem exist at all focal lengths, or only at the extreme wide or tele setting?
    3) Have you looked through the open ended lens and checked if the glass is clean and clear?
     
  10. Deadbear77

    Deadbear77 TalkEmount Hall of Famer

    Sep 14, 2012
    Northeast Ohio
    Kevin
    Ok now I'm an idiot. The 28/210 was slightly threaded wrong on the adapter causing a tilt.

    Wow what a rookie.

    Thanks guys.