So I played with an 800mm lens

Discussion in 'Photography Equipment & Products' started by Overread, Feb 22, 2011.

  1. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

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    Yep I really did!

    First a 100% crop from a shot taken with a 70-200mm f2.8 IS L M2
    1/200sec, ISO 100, f8 - flash used to aid lighting
    [​IMG]

    And now from the 800mm
    1/200sec, ISO 100, f8* - flash used to aid lighting
    [​IMG]

    Ok so not that amazing in subjects (its two books!) but each of those shots only went through RAW processing in defaults and only AAcountering sharpening was applied (ie standard same to both). For straight out of the camera the performance at 800mm (which as you've probably guessed is a pair of 2*TCs (sigma and canon M2) on the 70-200mm) is surprisingly good. Granted this is closer ranged stuff and its performance at distance might well suffer more significantly, but still its far and above what I'd expect with two TCs. I might actually try it properly in the field with a 2*TC and a 1.4TC and see how it goes.


    * f8 on the camera, but one TC is not reporting to the camera so chances are its two stops down from there already - so yes not ideal for high shutter speed work with 4 stops of light lost.


     
  2. molested_cow

    molested_cow TPF Supporters Supporting Member

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    So what is the main purpose of 800mm lens? If it's only good for stationary subjects, that really limits its use.
     
  3. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

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    Long distance photos of Canary Wharf of course - take the photos of the buildings outside of the range of the average security guard! ;)

    Though its more to see how the lens coped with having two 2*TCs added to it and it did far better than I expected it to. Plus get a really bright day or a flash with a better beamer and one might just be able to edge enough light to get a decent long ranged shot otherwise not possible with only a 400mm lens. Plus it opens the possibility that shots with a 2*TC+1.4TC are usable.
     
  4. soylentgreen

    soylentgreen TPF Noob!

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    I use the 1.4x and 2x TC on my 300 f/4L IS and really do not have a problem with the IQ. My fall back when I do not feel like lugging around the 400mm f/2.8. May be a tad soft at extreme distances, but is usable in a pinch. Post sharpening cleans up well. My friend does the same on her 300 f/2.8L IS and still gets AF.
     

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