Holy Distortion!

Discussion in 'Photography Equipment & Products' started by Markw, Sep 3, 2010.

  1. Markw

    Markw No longer a newbie, moving up!

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    Alright, so Ive been running about testing out my Nikkor 18-70mm F/3.5-4.5 ED IF AF-S DX lens against the Sigma 18-50mm F/2.8 EX DC lens. Well, these intrigued me:

    Only thing done to them was convertification from RAW.

    Settings for both are as follows:
    18mm
    F/4
    1/1600s
    ISO200

    [​IMG]

    [​IMG]

    More to come.

    Mark
     
    Last edited: Sep 3, 2010
  2. Markw

    Markw No longer a newbie, moving up!

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    More:

    [​IMG]

    [​IMG]

    18mm
    F/4
    1) 1/1600s 2) 1/2000s (on A)
    ISO200

    Mark
     
  3. Markw

    Markw No longer a newbie, moving up!

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    [​IMG]

    [​IMG]

    18mm
    F/8
    1/500s
    ISO200

    This one has the slightest difference so far. You can notice if you pull the photo up large, though by the slight bow of where the roof of the porch meets the front wall and in the middle of the frame between the windows.

    Mark
     
  4. Markw

    Markw No longer a newbie, moving up!

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    [​IMG]

    [​IMG]

    50mm

    Mark
     
  5. Markw

    Markw No longer a newbie, moving up!

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    [​IMG] [​IMG]

    50mm

    Mark
     
  6. Markw

    Markw No longer a newbie, moving up!

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    Well, thats really about it. But I was shocked to see these results!

    Mark
     
  7. kundalini

    kundalini Been spending a lot of time on here!

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    Since you don't mention which image is taken with which lens.....

    The bottom images are underexposed, all things being equal.

    However, the lens in the top image of post #5 handles the specular highlights better.
     
  8. Markw

    Markw No longer a newbie, moving up!

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    OH! Sorry about that. The photos on top are the Nikon, Sigma on the bottom. These tests ended up being mainly for distortion, as I figured that I am going to need to do some studio-type shots to really test sharpness. I was just surprised how much better the Sigma did with distortion.

    Mark
     
  9. Garbz

    Garbz No longer a newbie, moving up!

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    It's got a lower zoom range and more glass to work with. The Nikkor 28-70mm f/2.8 has next to no distortion either.

    Not that it matters really, just open the image in Adobe CameraRAW, or Lightroom or something that supports profile based corrections and click on the lens correction button. Better yet it'll fix vignetting problems too.
     
  10. Markw

    Markw No longer a newbie, moving up!

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    All this was to decide which to keep, if get rid of one at all. Thanks.

    Mark
     
  11. Stephen.C

    Stephen.C TPF Noob!

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    Side note, your backyard looks like the backyard from War of the Worlds ( tom cruise )
     
  12. Markw

    Markw No longer a newbie, moving up!

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    Thats not my backyard. Thats a house thats been up for sale for over two years. Someone tore the insides to shreds basically, and that is the renovation efforts so far.

    :thumbsup:
    Mark
     

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