Best Telephoto Lens for Nikon D3100

Discussion in 'Photography Beginners' Forum' started by dmeeksiphoto, Feb 19, 2012.

  1. dmeeksiphoto

    dmeeksiphoto TPF Noob!

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    I'm looking to buy a telephoto lens for my Nikon D3100 and my budget is $500 max. Also, I'd like to get a lens that will allow me to Auto Focus. Any tips or recommendations would be helpful. I'm open to fixed or zoom, I just want to know what's best and my main desire is to have great depth of field.

    It was recommended that I get an 85mm f/1.8, but I just wanted to get more information and find out if this will Auto Focus on my d3100.

    Thanks in advance.


     
  2. DiskoJoe

    DiskoJoe Been spending a lot of time on here!

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    Yes.
     
  3. Dao

    Dao No longer a newbie, moving up!

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    Are looking for shallow or deep depth of field? I thought great depth of field implies deep, but saw you were recommended a 85mm f/1.8. So you maybe looking for a lens that has wide max aperture.


    What are you planning to shoot with the telephoto lens? Is 85mm long enough? If it is for outdoor portrait type shots, 85mm is quite nice (with my cropped DSLR body). If it is for wildlife type or zoo animals, it maybe a little short.
     
  4. EchoingWhisper

    EchoingWhisper TPF Noob!

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    Sorry* didn't see the question well enough.
     
  5. EchoingWhisper

    EchoingWhisper TPF Noob!

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    I'd recommend a DX lens, because they're made for DX bodies and you wouldn't be taking lenses much more heavier than you should.
     
  6. KmH

    KmH In memoriam Supporting Member

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    Last edited: Feb 23, 2012
  7. dmeeksiphoto

    dmeeksiphoto TPF Noob!

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    I would like less depth of field. I mostly shoot friends and family on vacation and things.
     
  8. KmH

    KmH In memoriam Supporting Member

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    I guess you mean a shallow DoF so the background is blurred.

    Four factors control the DoF:
    1. Lens focal length
    2. focus point distance from the image sensor
    3. focus point distance to the background
    4. lens aperture.

    The closer to your subject you are, the closer the focus point is, and the shallower the DoF is. In othe words, if the only thing you change is the focus point distance, the Dof will also change with the DoF getting deeper as the focus point get further from the camera.

    But, if the background is right behind the point of focus, like a wall immediately behind your subject, the wall will also be prety much in focus too. That's why #3 in the list also matters.

    A key concept about the DoF is some of the depth-of-field (DoF) is in front of the point of focus, and some of it is behind the point of focus. The distribution of the DoF will vary from 25% in front/75% in back, to 50/50.

    An issue many new to photography have when using an f/1.8 lens is that at wide lens apertures the DoF can get so shallow it is difficult to control what is and isn't in focus.

    So there is a lot more to it than just buying a f/1.8 lens.

    [​IMG]

    [​IMG]
     
  9. chuasam

    chuasam Been spending a lot of time on here!

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    actually, No. And I would recommend that the OP go to a camera store and check it out.
     
  10. KmH

    KmH In memoriam Supporting Member

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  11. dmeeksiphoto

    dmeeksiphoto TPF Noob!

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  12. sm4him

    sm4him In memoriam Supporting Member

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    3100, 5100...it's all the same in regards to auto focus. Neither of these cameras has an internal motor, so to auto focus with them you need the AF-S lenses that have a motor in the lens. The newest Nikon 85mm f/1.8 fits that bill.
     

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