Not getting sharp focus on Nikon D90

Discussion in 'Photography Beginners' Forum' started by babbupandey, Apr 12, 2010.

  1. babbupandey

    babbupandey TPF Noob!

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    Hi Guys,

    I own a Nikon D90 and I usually have problem getting a sharp focus in my pictures. I know nothing is wrong with my camera because I used auto mode to take the same picture and the focus was very sharp.
    However, I usually like to shoot in aperture priority mode with dynamic focus so I can choose the point I want. Any tips will be welcome and appreciated.
    Thanks
     
  2. dyyylan

    dyyylan TPF Noob!

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    Might want to post some examples
     
  3. gsgary

    gsgary Been spending a lot of time on here!

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    Check your shutter speed it is probably camera shake
     
  4. babbupandey

    babbupandey TPF Noob!

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    I will reply with some pics and with description of how I took that photo. But regarding shutter speed, I was shooting in daylight and it was automatically setting it to be pretty high 1/1000s or something like that and I also had VR on - which considerable reduced the shakes.
     
  5. Dominantly

    Dominantly TPF Noob!

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    It's probably a result of your aperture, focusing mode, and dof.
    If you are shooting f/11 at 1/1000, with moving your focal point to your subject and not focus/recomposing, you should have sharp focus in your photos.
     
  6. babbupandey

    babbupandey TPF Noob!

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    Here is a sample, looks good until you zoom to 100%, the focus is really shoddy
    Here are the details of how I shot the photo:
    Mode: Aperture Priority
    ISO: 200
    Aperture: 1/5.6
    Shutter Speed: Auto (chose 1/1000s)
    Focal length: 55mm (FX equivalent: 82)
    I chose Dynamic AF-Area mode as the auto-area was selecting multiple points but I wanted the first pole to be in very sharp focus.

    [​IMG]

    The crop at the first pillar (where it is supposed to be sharpest):
    [​IMG]
     
    Last edited: Apr 12, 2010
  7. SushiWarrior

    SushiWarrior TPF Noob!

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    You're at a wide open aperture, lenses are generally very soft wide open. Stop it down to F/8 or F/11 and see what it looks like.
     
  8. babbupandey

    babbupandey TPF Noob!

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    This looks reasonable, I will try it asap. One quick question though, shouldn't the point at which I focussed should have still been clear or will that too be lost in the dof?
     
  9. Fedaykin

    Fedaykin TPF Noob!

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    Yep, this seems to be your problem. Try it at f/11
     
  10. Dominantly

    Dominantly TPF Noob!

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    With a shot like this, you should be looking to a smaller aperture to give you greater detail throughout the shot.
    Next time, try and stop all the way down to your smallest aperture (f/22 at 55mm with that lens), then focus about 21feet from out in front of you. Your depth of field will extend from 11 feet to infinity, your near level of acceptable sharpness will be from 21 feet to infinity.

    If you are focusing your shot all the way back into your scene (IE those trees), your focus on the foreground will be crap, making your shot look 90% soft (which most people will not get past).
     
  11. Alan92RTTT

    Alan92RTTT TPF Noob!

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    This could be part of the issue. Set the AF-area mode to Single Point.

    Dynamic and auto will pick where the focus goes and it may not be where you want.
     

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