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  1. #21
    Senior Member
    Bikerbrent's Avatar

    Re: D7100 Inconsistent autofocus. Backfocus / front-focus

    Welcome aboard. Enjoy the ride.
    We look forward to seeing more posts and samples of your work.


    › See More: D7100 Inconsistent autofocus. Backfocus / front-focus
    Brent: Poway, CA
    D7200, D200, F100
    Tokina 12-24mm
    Nikon 18-200mm
    Tokina 28-70mm f2.6-2.8
    Nikon 80-200mm f2.8
    Sigma 150-600mm
    Nikon 50 AF f1.8
    Tokina 100mm f2.8 Macro
    Nikon SB800



  2. #22
    Senior Member
    mikew's Avatar

    Re: D7100 Inconsistent autofocus. Backfocus / front-focus

    Quote Originally Posted by intihuatana View Post
    I just want to confirm this focus issue with the D7100. This week I upgraded from the D7000 to the D7100. As it turns out I got TWO different cameras from TWO different vendors by accident. SO Naturally the question is which one to keep and which to return?


    My first instinct was to return the camera body with a much higher shutter count. But as it turns out, tests with the same lens (35mm 1.8 DX G) and the same focus settings showed one camera to be suffering from very bad focus issues! As noted both back and in front of the subject. But generally Backfocus was worse. At least now I know which camera to return. And also to note the auto focus in Live View is much better and consistent. This is a very odd thing and I wonder if the LV uses a different focus sensor?
    The D7100 is a older camera so i hope this modern explanation is correct, AF in the viewfinder is phase detect which needs the image to be focused via reflection to the focus detector then and back to the viewfinder/sensor, this obviously leaves scope for adjustments to be made, if you are seeing back and front focus errors then something else is wrong it should only be one or the other.
    Focusing in LV uses contrast and it focus more at the sensor rather than calculating adjustments so if you dont have a fault with your lens it should be correct every time.
    Even a brand new camera can need AF fine tune and it can be different for each lens but once done on each the camera should remember it.
    Mike



    https://www.flickr.com/photos/[email protected]/


    Nikon V2,10-30MM,30-110MM FT1 Adapter













  3. #23
    Senior Member
    mikeee's Avatar

    Re: D7100 Inconsistent autofocus. Backfocus / front-focus

    I have a d7100 and can get some good sharp focus when a numbers of lenses.. Maybe post some photos of your issue?
    D7500 / D7100 / N6006 / Nikon AF-S 35mm / Nikon AF 50mm / Sigma 17-50mm / Nikon AF-P FX 70-300mm / Tokina 11-16mm / Sigma C 150-600mm / Sigma A 50-100mm / Nikon AF-S 105mm Micro

  4. #24
    Staff
    Super Mod
    hark's Avatar

    Re: D7100 Inconsistent autofocus. Backfocus / front-focus

    Quote Originally Posted by mikeee View Post
    I have a d7100 and can get some good sharp focus when a numbers of lenses.. Maybe post some photos of your issue?
    I have a refurbished D7100 that is the sharpest body of all my Nikons so am thinking the same as you.
    Cindy - D750, D500, D7200
    Flickr
    and My 2020 Thread

    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci







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