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Thread: Duck shots!

  1. #1
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    Duck shots!

    i think i have a BF issue. used spot focus in AF-A and AF-S mode but still pics were a little soft. took many but only a few came out good.
    had to sharpen in IDC. may have overdone it however.

















    Last edited by Elisha; 03-15-2009 at 06:52 PM.
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  2. #2
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    Well, if it's OOF no amount of sharpening will correct it. Looking at these, it doesn't look like there is any back/front focus issue and of course, it's a consistent problem that doesn't change from shot to shot.
    "Wide area" focus mode can cause OOF probs but as you were on "spot", that's not it.
    Small DOF is a possibility but these don't look close enough to cause an issue, unless I'm mistaken and you were within 10ft or so. (You could have gone to 1/250th at f8 for more DOF)
    Could you just have "missed" it.

  3. #3
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    glad you like it Peter, these were all significant crops. 50% or more on each.

    it's hard to explain but i focused on the eyes of each duck and it did not look sharp on the LCD. it looked quite soft on the PC as well till i did some PP.

    i took plenty of shots but these were the only ones i thought were acceptable.

    i printed the focus chart and tested the focus, the 28-135 and the beercan seem to be pretty accurate but the 35-70 and the 50mm seem to have pretty bad BF.
    i did the test with the 3 batteries but could not come up with anything conclusive but the chart test was surprising.
    however i may have to redo them and make sure that the focus angle is 45 degress to the focus point. i was just guessing it was 45 degrees since my tripod didn't have any kind of indicator.
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  4. #4
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    the crop is pretty aggressive and the glass isnt very good.
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  5. #5
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    yeah the crop is pretty aggressive, i was at max zoom of 135mm on pretty much all shots as far as i know.

    how can you tell if the glass is no good?
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  6. #6
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    Quote Originally Posted by Elisha82 View Post
    i printed the focus chart and tested the focus, the 28-135 and the beercan seem to be pretty accurate but the 35-70 and the 50mm seem to have pretty bad BF.
    i did the test with the 3 batteries but could not come up with anything conclusive but the chart test was surprising.
    however i may have to redo them and make sure that the focus angle is 45 degress to the focus point. i was just guessing it was 45 degrees since my tripod didn't have any kind of indicator.
    It seems that Sony are slightly more conservative with in camera sharpening than Canon, but you can always alter the camera setting if you're not happy. Or you can sharpen afterwards anyway, but don't overdo it.

    I know I've said this before, but B/F focus issues are invariably down to the camera AF system, not the lens. If the lens is out of adjustment, then it's always OOA.

    You don't have to worry about being precise over the camera angle to the chart, but err on the shallower side.

  7. #7
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    Peter, does the creative styles sharpening adjustments effect the RAW files or is that for jpeg only?


    and a goose:

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  8. #8
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    Just the JPEG.

  9. #9
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    Quote Originally Posted by Elisha82 View Post
    how can you tell if the glass is no good?
    cos nothing in your sig is particularly good.
    BF is far more likely to be a lens issue. use the micro adjust on the a700.
    Last edited by Rooz; 03-15-2009 at 07:19 PM.
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  10. #10
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    Quote Originally Posted by Rooz View Post
    cos nothing in your sig is particularly good.
    BF is far more likely to be a lens issue. use the micro adjust on the a700.
    You gotta love that Rooz, nothing if not predictable. If it doesn't have Canon on it, it's no good.
    Ignore him, Elisha, short of "G" glass your lenses aren't half bad. In fact the 28-135mm is probably "G" quality.

    The 700 doesn't have micro adjust yet, it may do with v5 firmware but we're waiting in hopes and..
    I'll await with interest to hear your technical explanation of how the lens, rather than the AF system, causes B/F focus.

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