Nikon D300 and registration of lenses.

Discussion in 'Digital SLR' started by Eric Stevens, Jan 3, 2011.

  1. Eric Stevens

    Eric Stevens Guest

    Over the Christmas period I went out and pushed my Nikon D300 and AF-S
    VR Nikkor 70-200 1:2.8G to the limit. I was taking night exposures of
    my nephew's New Year's Eve party across the bay. Nearly a mile of
    water and up to 60 seconds of exposure.

    I quickly found out that the lens was not quite focusing to infinity
    and that I had to manually focus just a little bit short.

    I know that this problem can be dealt with by registering the lens
    with the camera and entering an appropriate focus correction.

    My problem is that, even though I know it is there, I cannot find any
    reference as to how to do this anywhere in the manual (I also know
    that the information is cryptic even if you can find it).

    Another problem is that although this has been discussed in one or
    more news groups, I have deleted older messages and this vital
    information has gone from my computer.

    Yet another problem is that while I have a book which describes how to
    do all this in adequate detail, I have lent it to my daughter (who is
    now a thousand miles away) who has in turn lent it to _her_ daughter
    who is now over the middle of the Pacific on the way to New York.

    Is there anyone who can help me by either directing me to the relevant
    page of the manual or to a helpful web page.

    From a sweltering New Zealand ...

    Eric Stevens
    Eric Stevens, Jan 3, 2011
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  2. Are you sure that the softness you are seeing is due to focus
    problems? At 1 mile, the hyperfocal distance at 200mm and f/2.8
    is around 2830 feet.

    The "AF Fine Tune" feature of the D300 is described on page 327
    of the U.S. manual. It's designed to deal with front focus/back
    focus issues, but getting AF confirmation on something a mile away
    isn't going to be easy in daylight let alone at night.

    Like most lenses with exotic glass in them, the 70-200 can "focus"
    slightly beyond infinity under many environmental conditions, but
    if the lens is truly not focusing to infinity, that's not something
    that can be corrected by lens registration and requires repair.
    Michael Benveniste, Jan 3, 2011
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  3. Eric Stevens

    me Guest

    Michael has all ready replied that AF Fine Tune resides at pp 327-328
    of the fine manual. Do note the following note on p328:

    AF Tuning
    The camera may be unable to focus at minimum range or at infinity when
    AF tuning is applied.

    Question how are you setting the lens to focus at infinity? Are you
    manually setting the focus using the distance setting on the lens
    barrel and then finding you need to manually set it to a slightly
    shorter distance? If so, I don't believe this fine tune adjustmanet
    will help you.
    me, Jan 3, 2011
  4. Eric Stevens

    Eric Stevens Guest

    That's what I was looking for! Thank you very much.
    There was a fire on the beach and lights in the trees.

    Eric Stevens
    Eric Stevens, Jan 3, 2011
  5. Eric Stevens

    Eric Stevens Guest

    You may well be right but, first I wanted to find what the manual had
    to say about it.

    Eric Stevens
    Eric Stevens, Jan 3, 2011
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