Canoner Has Questions - Extender Stacking

Discussion in 'Digital Discussion & Q&A' started by Mesh1DMarkIV, Feb 8, 2012.

  1. Mesh1DMarkIV
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    Mesh1DMarkIV New Member

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    I currently own a Canon 70-200mm f2.8L USm IS II lens. I also own 2 Lens extenders..1.4X and 2.0x. Is it safe for me to stack these extenders on to the Canon lens? Canon 70-200mm + 1.4x +2.0x?

    I also own Canon 24-105mm F4L, Canon 24-105 f2.8L and canon 100mm f2.8L lens - can I use canon extenders on these lenses? Thank you for your advice.
  2. KmH
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    KmH Helping photographers learn to fish

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    Why would you want to?

    The loss of image quality and the 3 stop loss of effective lens aperture would suck.

    f/2.8 would effectively become f/8 and f/4 would effectively become f/11.
  3. MLeeK
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    MLeeK New Member

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    Yes, you CAN do it. You just wouldn't want to.
  4. Mesh1DMarkIV
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    Mesh1DMarkIV New Member

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    Thank you for your reply. Apart from Loosing 3 stops do you think it might interfere with the elctronics of the Camera
  5. mjhoward
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    mjhoward New Member

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    No you can stack them safely. I've done it several times with (2) 2x Extenders and an 800mm f/5.6. Works just fine, you'll lose AF and the photos will be softer but it won't damage your camera or lens. They're made to work stacked.
  6. mjhoward
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    mjhoward New Member

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    BTW, there is a massive difference in the Extender II's and the new Extender III's, at least when coupled with the new 400mm f/2.8 II. That combo was almost indistinguishable in sharpness from the 800mm prime.
  7. Mesh1DMarkIV
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    Mesh1DMarkIV New Member

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    Does that mean that the Canon Extenders II are better than the III extenders or vice versa?
  8. mjhoward
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    mjhoward New Member

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    Extender III is significantly better than II. Keep in mind though that teleconverters work best on longer, high quality primes. They probably wont do so well on something like 24-70 or even the 70-200. That is just a guess though as I've never used the teleconverters on those lenses, only the 800mm and new 400mm II.

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