Got a new lens, cant figure out how to control DOF.

Discussion in 'Photography Beginners' Forum' started by ChrisJuliano, Sep 22, 2008.

  1. ChrisJuliano

    ChrisJuliano TPF Noob!

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    I got a sigma 105mm f2.8 macro lens for my Nikon D40, took lots of shots but it had a veryyyy small DOF, so asked someone and they told me to change my f-number, so tried but my D40 says lock it on highest # which is 32.

    Then they told me to change it on the camera itself, but from what I could tell that didnt change anything.

    What should I do?
     
  2. Boz Mon

    Boz Mon TPF Noob!

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    In order for that lens to work on the D40, you have to lock the aperture to the highest F stop, in your case 32. Then, to change the stop, you do it like you would with any other lens, via the little button on top, and the thumb wheel. Also, I have a Tamron 90mm macro lens that I use with my D40, and the DOF is really really shallow.
     
  3. ChrisJuliano

    ChrisJuliano TPF Noob!

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    But isnt there a setting to change it so there is a bigger DOF?


    I tried using the normal button on top with wheel, dosnt change much infact I couldnt see a difference.
     
  4. andrew99

    andrew99 TPF Noob!

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    Set the camera to the A (Aperture Priority) Mode, this way the thumb dial will change the aperture f number. Setting large apertures (small f numbers) makes for shallow depth of field, smaller apertures (higher f numbers) makes for larger depth of field.

    For example, shooting at f2.8 will give you a shallow depth of field (blurry background), but f11 will keep more in focus. I also suggest reading the camera's manual and watching the DVD that came with it! :)
     
  5. ChrisJuliano

    ChrisJuliano TPF Noob!

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    Thanks, but I was on manual when changing the f-number.

    I think I went from 2.8 to like 62 or 64? And dont think I saw a difference. This was done with the lens locked to 32.
     
  6. deanimator

    deanimator TPF Noob!

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    How far away from the camera is the subject?

    If it´s quite close you may see little difference in the DOF
     
  7. ChrisJuliano

    ChrisJuliano TPF Noob!

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    Well some is 1:1 with 105mm macro.

    But most was like a 1:1 range to a foot away, so like 4 to 12 inches away.
     
  8. davebmck

    davebmck TPF Noob!

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    You are going to get shallow DOF with a macro, especially if you are shooting very close to your subject. With my 100mm, if I am at the minimum focus distance and at F8 or F11, the DOF is about 1/8 inch. The only thing you can do at this distance is to decrease the aperture to F22 or higher, but you will still have a very narrow DOF.
     
  9. ChrisJuliano

    ChrisJuliano TPF Noob!

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    Hmm, thats kinda dumb I dont see how I can pull off pictures like some of the ones I saw on flickr and this forum.

    Eh :[
     
  10. tsaraleksi

    tsaraleksi TPF Noob!

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    Are you seeing these differences in photos you take or just looking through the camera?
     
  11. ChrisJuliano

    ChrisJuliano TPF Noob!

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    Looking through the cameara I dont think it should change, does it?

    And I was looking after I took the pic on the screen.
     
  12. davebmck

    davebmck TPF Noob!

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    It's not easy, believe me, I have been trying. There are some real pros here doing this, maybe they can chime in with some tips.
     

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