D2X focusing Issues Revisited

Discussion in 'General Technical Discussion' started by Desert Rat, Dec 18, 2005.

  1. I know from reading the older posts on the list about the D2X having a focusing issue...
    The questions I have regard it it are as follows.

    Since I started shooting moving targets.. i.e. mostly birdies in flight and even ones just sitting there posing I have noticed a few things.
    I am shooting with a 200-400VR and either a TC14E II or TC17E II and try to keep the shutter speeds up pretty high, but I also want to keep the ISO as low as possible. I also shoot somewhere around F5.6-F9 most of the time if possible.. Was curious to know if I should stop down more that F( when using the TC or is that enough?

    I have noticed that sometimes at slow shutter speeds I can get some really sharp images, and I can get some really lousy images. Same is true when i keep the shutter speeds up over 1/1000

    When viewing the RAW images in Nikon view and blowing them up to 100% (What I thought was the right way to check sharpness and focus) is they are hit and miss on what I think is sharpness and focus.

    I will post a few raw images tomorrow for you to peruse at your leisure. They were shot that last few weeks...
     
  2. nfoto

    nfoto Guest

    Sounds like you have a VR issue with the lens, or that the tripod isn't up to the task. My experience is that VR isn't 100% reliable on a tripod, no matter what the manufacturer claims. Also note that VR may introduce a delay before the shutter trips, again a potential cause of unsharp images when the subject is moving. What good does a stabilised lens do when the bird has flown the coop?

    My advice is to shoot wide open for a while, since you get the highest shutter speeds that way, enabling movement to be "frozen" better (since it seems to me that you birders are obsessed with immobilised birds), and because DOF is a minimum, it's easier to evaluate the images for perfect focus.
     
    Last edited by a moderator: Dec 19, 2005
  3. Flew

    Flew

    994
    Jan 25, 2005
    Alabama
    Excellent suggestions Bjorn, whether you are shooting with the D2X, or any camera. A good way to get back into shooting after a several week layoff. Sometimes shooting at f8 can disguise flaws in not only the AF system, but even more so in our tracking and shooting skills.

    Thanks!!
     
  4. Well here are some of the RAW files... All shot in the last two weeks... All shot with varying aperatures and shutter speeds.... Either with or without converters...

    The first three to me look pretty good for focus and sharp for a RAW unprocessed file...

    http://s15.yousendit.com/d.aspx?id=336T3E61Y8Q050HS1IMNIE62R3

    http://s15.yousendit.com/d.aspx?id=2IWPTOOGPGUNN24LXVAN5Z2701

    http://s15.yousendit.com/d.aspx?id=0ZAF8O4XAXWPD2OGCB99T5E4LM

    These three shots were taken yesterday afternoon... To me thay just don't look very focused like the other three...

    http://s15.yousendit.com/d.aspx?id=1APOIDJ0SA1TN2H1OVG7DX06UP

    http://s15.yousendit.com/d.aspx?id=2F41JSX79T5YD12I5GU1YQAH51

    http://s15.yousendit.com/d.aspx?id=3CTNZ4P8WY0U52AKQX0HFCAUVT
     
  5. Bjorn, I usually wait till the VR is active before pressing the shutter all the way. I can hear it click and make noise that it is working in the lens...
    All of the shots I just posted are stationary birds, not moving at all or moving just slightly.. When i shoot I take a burst mode of 3-4 frames them stop and evaluate them. I know from experience that sometimes the first shot is not the best bcause of the motion or vibration in teh camera from teh shutter and mirror firing...

    I also have a Wimberley Sidekick and Kirk BH-1, and Manfrotto o55MF3 Carbon fiber tripod which is quite stable.

    In regard to moving subjects.. I can go out and shoot airplanes or military jests with my 70-200VR and converters and I get really sharp well focused images... All handheld....
    Also, for landscapes I have that setup worked out as well.. Mirror lockup, cable release and everything for those are quite sharp and well focused.. Even the RAW files appear well focused and relatively sharp.. I know the RAW files are not perfect, but they sure look real good and require very little post processing work.

     
  6. Hey Frank.. Problem is I have not been away from the camera for a few weeks.. I have been out at least once a week with the 200-400 since I got it and I am getting inconsistent images.. Even on teh same day some images are great and others are so-so.. Figured my technical skills would have improved the more I go out shooting...

    =======================================

     
  7. Flew

    Flew

    994
    Jan 25, 2005
    Alabama
    Eric,

    I was really just responding to the suggestion of shooting wide open as an evaluation of the AF performance as well as the tracking / aiming of the cam at the subject. This sounds like a good practice / training technique.

    I wasn't really responding to your question. Sorry if I hijacked your thread. :redface:
     
  8. Last edited by a moderator: Mar 15, 2017
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