AF tracking - 11/39/51 points - real world differences

Discussion in 'Nikon' started by Caps, Feb 19, 2013.

  1. Caps

    Caps New Member

    Joined:
    Jul 10, 2012
    Messages:
    47
    Likes Received:
    2
    Trophy Points:
    0
    Location:
    Wash. Dc
    Gallery:
    Ratings:
    +2 / 0
    My Photos Are OK to Edit
    hi all,

    I'm wondering what the real-world differences are between the 39 point focus and 51 point focus for action/sports. I've read conflicting opinions about the two - some saying the 39 point (D7000) is just as fast or faster than the 51 point (D300s).

    Has anyone here used both and can you comment on the actual differences seen from shooting both.


    Thanks....
     
  2. kundalini

    kundalini Well-Known Member

    Joined:
    Jul 18, 2007
    Messages:
    13,443
    Likes Received:
    1,853
    Trophy Points:
    113
    Location:
    State of Confusion
    Gallery:
    Ratings:
    +1,863 / 0
    My Photos Are NOT OK to Edit
    12 points.


    My Nikon bodies have 9, 21 & 51 AF points, but 99% of the time I have it set to 21. I don't shoot a lot of action / sports, but the times I have 21 seems to be fine for me and have set it to 9 just to reduce the amount of AF point adjustment. Anticipation of the action is the key, methinks. 51 point might be okay with the dynamic tracking. The best bet is to try them all out and see which one fits you better.
     
  3. Caps

    Caps New Member

    Joined:
    Jul 10, 2012
    Messages:
    47
    Likes Received:
    2
    Trophy Points:
    0
    Location:
    Wash. Dc
    Gallery:
    Ratings:
    +2 / 0
    My Photos Are OK to Edit
    12 points. :lol:

    Maybe I'm not asking the question correctly. Is there a difference between the different tracking systems in terms of quality? I'm sure it's possible to make different quality tracking systems with missles (the old man was a scientist), so surely its possible with a camera range finder.
     
  4. TheLost

    TheLost Well-Known Member

    Joined:
    May 17, 2012
    Messages:
    1,189
    Likes Received:
    330
    Trophy Points:
    83
    Gallery:
    Ratings:
    +339 / 0
    My Photos Are NOT OK to Edit
    The simple answer is:

    For Auto Focusing... It gives the camera more choices to focus on.
    For User Select Focusing... It gives the human (you) more choices to focus on.

    The more complex answer:

    Its not about how many points, its about the entire auto focus system. The Multi-CAM 3500FX system in the D4/D800 is faster and more robust then the Multi-CAM 4800DX in the D7000. The 51 point system also gives you 15 cross type sensors while the 39 point system only gives you 9.

    In real-world-shooting i hit the limits of the D7000's focus system all the time. Its why LOTS of people have stayed with the D300/D300s and it's Multi-CAM 3500DX AF system (faster and more accurate).



    In a nutshell... its the system as a whole and not just the number of points :)
     
  5. KmH

    KmH Helping photographers learn to fish

    Joined:
    Apr 9, 2009
    Messages:
    34,519
    Likes Received:
    4,219
    Trophy Points:
    113
    Location:
    Iowa
    Gallery:
    Ratings:
    +4,318 / 9
    My Photos Are OK to Edit
    The D7000 Multi-CAM 4800 AF module is newer but only has 9 cross-type focus points, and has a lower light limit of -1 EV.

    The older Multi-CAM 3500 AF module has 15 cross-type focus sensors, and also has a lower light limit of -1 EV. Note that Nikon's flagship, pro grade D4, and the prosumer grade D800, both use the newer version of the Multi-CAM 3500 AF module that has a lower low light limit at -2 EV.

    Both are phase-detection systems whose speed is limited by the lens focus motor, not the electronics of the focus module. Many of Nikon's fastest focusing lenses are the older screw-drive, AF designated lenses, that rely on the auto focus motor in the camera body.

    AF-S lenses don't have a physical connection to that in the camera screw-drive focusing system, and can only use the AF motor in an AF-S lens.
     
    Last edited: Feb 19, 2013
  6. Caps

    Caps New Member

    Joined:
    Jul 10, 2012
    Messages:
    47
    Likes Received:
    2
    Trophy Points:
    0
    Location:
    Wash. Dc
    Gallery:
    Ratings:
    +2 / 0
    My Photos Are OK to Edit
    Great info guys....thanks.

    I wasn't sure about upgrading to a used D300 (like buying an older outdated computer) but now I'm okay with it.
     

Share This Page

Search tags for this page
39 AF vs 51 AF points
,

39 focus points vs 11 focus points

,
39 focus points vs 11
,

39 af points vs 51 af points

,
Advanced Multi-CAM 3500DX vs 4800DX
,
af point 39 vs 51
,
difference between dual af and 11 point af
,
nikon 39 focus points vs 51
,
nikon 51 39 af points
,

what is the difference between 39 af point and 11 af point