70mm or 70mm ?

Discussion in 'Beyond the Basics' started by DeadEye, Jul 31, 2009.

  1. DeadEye

    DeadEye TPF Supporters Supporting Member

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    Both shot from same place, no cropping, just changed the lens and shot at 70mm far end of the zoom. Lens 1 24-70L : Lens 2 70-200L




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  2. Annamas

    Annamas TPF Noob!

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    Is one EF-S?
     
  3. bitteraspects

    bitteraspects TPF Noob!

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    hmm......
     
  4. DeadEye

    DeadEye TPF Supporters Supporting Member

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    No there both L glass
     
  5. Dao

    Dao No longer a newbie, moving up!

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    I think the field of view is not too far off. But the perspective distortion are different between the 2 lenses in 70mm focal length.

    Also, as I learned from lens review sites, when comparing different lenses, they found the field of view of the lenses are different. A 17mm in Lens A is different from 17mm in lens B. So lens are created different.
     
  6. JerryPH

    JerryPH No longer a newbie, moving up!

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    I've done the same experiment wit my 24-70 and 70-200 and because I had the camera on a tripod, the results were for all intents impossible to tell apart without looking at the EXIF.

    Have any filters on the lenses? Did the lighting conditions change? Any fog in the area? If no in both cases, I think you just discovered which lens works better for you at this focal length. I am surprised at the amount of difference in contrast and saturation, though.
     
  7. DeadEye

    DeadEye TPF Supporters Supporting Member

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    Well the fog was on the move, a bank rolling through. We did swing some on the anchor chain.
     
  8. JerryPH

    JerryPH No longer a newbie, moving up!

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    The perspective changed a little, the lens change was relatively quick... 30-45 seconds between shots?

    How about the filters question? Fog is a possible partial reason, but I doubt the only one.
     
  9. DeadEye

    DeadEye TPF Supporters Supporting Member

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    I had to go inside to lens change maybe 2 minutes. No filters used.
     
  10. JerryPH

    JerryPH No longer a newbie, moving up!

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    I'd put the brunt of the differences on the fog... It would be interesting to see the same test again with camera on a tripod and no more than 10 seconds difference between shots. I bet they would be a lot closer.
     
  11. DeadEye

    DeadEye TPF Supporters Supporting Member

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    It may have be the lens itself foged when going from the cold AC cabin to outside hot and humid as well.
    The IQ was due to fog. The field of view differance is what got my attention. I shall retry on tripod at later date.

    Thanks All. Dan
     
  12. Dao

    Dao No longer a newbie, moving up!

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    When I superimpose 2 images together, the buildings in the background did not change too much between the 2 photos when compare with the ship.

    In other words, if the pictures has no ship, it looks very similar in terms of field of view.

    I know the perspective distortion is related to focal length, but it seems like there are some other factors. Angle of view? really not sure.
     

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