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  1. #1
    Senior Member

    What is backfocus?

    I was cruising through lenses on ebay reading discriptions and on one the seller said, "works well on my D750 on live focus mode but has back focus if I use normal mode." Can someone please explain this? Thank you


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  2. #2
    Senior Member
    pforsell's Avatar

    Re: What is backfocus?

    Quote Originally Posted by arshuter View Post
    I was cruising through lenses on ebay reading discriptions and on one the seller said, "works well on my D750 on live focus mode but has back focus if I use normal mode." Can someone please explain this? Thank you
    It means that the lens focuses behind the intended target (further away from the camera.) Sometimes this can be helped with the camera auto focus fine tuning, but if it is a valuable Nikkor lens, I'd send it to Nikon service. If it is an off-brand lens or a cheap Nikkor kit lens, I'd forget about it.

    There are a few old Nikon lenses that cannot be tuned to work perfectly. For example the AF 80-200mm f/2.8 one-ring lens is one of those.
    Thanks/Like arshuter Thanks/liked this post
     
    9 Nikon single-digit pro bodies from D1H to D5.
    12 Nikon three-digit consumer bodies from D100 and up.
    56 Nikkor prime lenses from AIS 8/2.8 to AFS 400/2.8VR
    4 Nikkor zoom lenses: 14-24/2.8, 17-35/2.8, 28-70/2.8, 70-200/2.8VR
    My fastest lens is f/1.2 (x3) and slowest f/2.8


  3. #3
    Senior Member

    Re: What is backfocus?

    Quote Originally Posted by pforsell View Post
    It means that the lens focuses behind the intended target (further away from the camera.) Sometimes this can be helped with the camera auto focus fine tuning, but if it is a valuable Nikkor lens, I'd send it to Nikon service. If it is an off-brand lens or a cheap Nikkor kit lens, I'd forget about it.

    There are a few old Nikon lenses that cannot be tuned to work perfectly. For example the AF 80-200mm f/2.8 one-ring lens is one of those.
    This was just an off brand. I didn,t intend to buy it I have never heard that term before and was curious what they meant. Thank you for clearing it for me.

  4. #4
    Senior Member
    pforsell's Avatar

    Re: What is backfocus?

    Quote Originally Posted by arshuter View Post
    This was just an off brand. I didn,t intend to buy it I have never heard that term before and was curious what they meant. Thank you for clearing it for me.
    No problem. There's also the complementary term front focus, which means the camera focuses a bit short from the intended target.
    9 Nikon single-digit pro bodies from D1H to D5.
    12 Nikon three-digit consumer bodies from D100 and up.
    56 Nikkor prime lenses from AIS 8/2.8 to AFS 400/2.8VR
    4 Nikkor zoom lenses: 14-24/2.8, 17-35/2.8, 28-70/2.8, 70-200/2.8VR
    My fastest lens is f/1.2 (x3) and slowest f/2.8


  5. #5
    Staff
    Super Mod
    hark's Avatar

    Re: What is backfocus?

    What is backfocus?
    Not sure how third party lenses work, but this explains how to adjust the AF if a lens front or back focuses on a Nikon body. I'm not sure if this feature is available on the D3xxx or D5xxx series though.

    Cindy
    Flickr
    and My 2019 Thread

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







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