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  1. #71
    Senior Member
    FredKingston's Avatar

    Re: Nikon NY Repair Center

    Quote Originally Posted by hark View Post
    I have no idea. One thing he asked is for me to turn off AF Fine Tuning. Although I forgot to do that, there isn't any value listed for just the 300mm lens since I don't use the lens alone. I am surprised by what he wrote and need to go out yet again. But it makes me wonder why would the AF Tuning affect the image if it is turned on without being set to any number.

    This is what he wrote:
    That would make sense to me Cindy. If all your images have AF Fine Tune turned ON... then trying to analyze image sharpness between the two states would be impossible. AF Fine Tune adds a focus bias... If all images are from the same state "ON"... then it becomes impossible to determine exactly what bias is being applied from one lens to the next and whether the AF Fine Tune is even actually working. IOW, if your AF Fine Tune for lens X is a +5, is it really adding a +5 and NOT a -10? Or if is a +5, is it really even adding a +5 at all? Without the camera and lens in hand to test, it would be difficult to determine without two images, one with +5 and one with AF Fine Tune OFF or at base 0...


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  2. #72
    Staff
    Super Mod
    hark's Avatar

    Re: Nikon NY Repair Center

    When I was out testing this lens again today, I noticed something. I hold the back button (only using the center focus point as single point focus), and press the shutter button. As the camera takes the image, immediately before the mirror closes in the viewfinder, I see the image jumping slightly within the frame - making my subject no longer exactly in the center. And since I have the focus point enabled on my rear screen, quite often the focus point isn't on top of my subject because of the image moving. And that is more of a VR issue than anything. And it's possible with me holding down the back button, the camera might refocus in that moment and focus on whatever the focus point lands on. I'll see if I can take a photo of the rear display showing how the focus point is no longer on a subject. At least that might be one reason.
    Cindy - D750, D500, D7200
    My 2021 Thread

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



  3. #73
    Staff
    Super Mod
    hark's Avatar

    Re: Nikon NY Repair Center

    Nikon NY Repair Center
    Here are a couple from yesterday's outing. Considering both are cropped quite a bit, and the focus point moved partially off of them, the sharpness isn't too bad. I focused on the face which is slightly soft. It's having to wait the extra time for the VR to settle that is a big pain. But if the focus point had focused way behind, then neither would have been acceptable.

    Nikon NY Repair Center-_5dx5293-low-res.jpg

    Nikon NY Repair Center-_5dx5294-low-res.jpg
    Cindy - D750, D500, D7200
    My 2021 Thread

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



  4. #74
    Senior Member
    Needa's Avatar

    Re: Nikon NY Repair Center

    Quote Originally Posted by hark View Post
    When I was out testing this lens again today, I noticed something. I hold the back button (only using the center focus point as single point focus), and press the shutter button. As the camera takes the image, immediately before the mirror closes in the viewfinder, I see the image jumping slightly within the frame - making my subject no longer exactly in the center. And since I have the focus point enabled on my rear screen, quite often the focus point isn't on top of my subject because of the image moving. And that is more of a VR issue than anything. And it's possible with me holding down the back button, the camera might refocus in that moment and focus on whatever the focus point lands on. I'll see if I can take a photo of the rear display showing how the focus point is no longer on a subject. At least that might be one reason.
    My 70-300 will do this occasionally. Never determined if it was related to VR or the mirror moving. Don't seem to have the problem with any other lens. Maybe only happens on longer focal lengths. Are you able to duplicate it when not using BBF?
    Would it be helpful to turn on focus point in playback? It might give an indication as to whether the camera thought it achieved focus and where. Be interesting to try on a mirrorless.

  5. #75
    Staff
    Super Mod
    hark's Avatar

    Re: Nikon NY Repair Center

    Quote Originally Posted by Needa View Post
    My 70-300 will do this occasionally. Never determined if it was related to VR or the mirror moving. Don't seem to have the problem with any other lens. Maybe only happens on longer focal lengths. Are you able to duplicate it when not using BBF?
    Would it be helpful to turn on focus point in playback? It might give an indication as to whether the camera thought it achieved focus and where. Be interesting to try on a mirrorless.
    I have the focus point enabled for playback. It only happens in Normal VR, not Sport or without any VR. This is the only lens I have that I've noticed it happens.
    Cindy - D750, D500, D7200
    My 2021 Thread

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







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