crop lenses vs. 35mm lens...

Discussion in 'Photography Equipment & Products' started by jackieclayton, Mar 29, 2010.

  1. jackieclayton

    jackieclayton TPF Noob!

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    i'm so confused, can someone help me? If you have a lens that says 18-55mm DX, does that mean that on a DX camera it actually is 18-55mm or do you still have to factor in the magnification. Like is an 18-55mm DX lens on a DX camera really 28-82mm? If so...Why have DX lenses? I"m so confused...
     
  2. JimmyO

    JimmyO TPF Noob!

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    An 18mm FX lens is still a 18mm on DX, but it will just look different. DX is just cropping in from FX. So
     
  3. jackieclayton

    jackieclayton TPF Noob!

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    ok, thanks jimmy. thats what I figured but I wanted to make sure. Just playing around the other day and when I put my 18-55 lens on my FX camera, I told my camera to detect a DX lens therefore would act like a DX camera. When I took the shot at 18mm it came in cropped... not as wide as it was using the same lens with my DX camera.
     
  4. Formatted

    Formatted TPF Noob!

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    DX lens are smaller than FX lens so you end up with a cropped image with a FX Camera and DX Lens. Because its only using the centre part of the sensor.

    FX lens are larger so when on a DX camera they have something called crop factor (x1.5), your 70-200 FX becomes a 105 - 300. For canon its x1.6.
     
  5. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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