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Old Jul 12, 2004, 3:15 PM   #1
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Hi, these 2 extenders are nearly the same price. It would make sense to me to go for the 2.0. Why would they cost the same? One is longer..is it that image quality is not as great with 2.0? Any advice would be appreciated. Thanks
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Old Jul 12, 2004, 3:45 PM   #2
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What you gain in focal length with the 2x over the 1.4x; you lose in F stops.
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Old Jul 12, 2004, 3:56 PM   #3
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So if I am using a Canon 70-200mm f 2.8 L IS would it be worth losing the F stops? I am not even really sure being a newbie what F stops do. Thanks for any advice.
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Old Jul 12, 2004, 4:07 PM   #4
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I have both TC's and the lens you're referring to. The 1.4 works very well with it, the 2.0 gives fair results image wise. The 2.0 works in a pinch, but you're going to give up some quality -- it's still acceptable, but will be significantly softer than a comparable 400mm lens.

Each f-stop doubles or halves the amount of light. A 2.0 extender willchange your 70-200 f/2.8 into a 140-400 f/5.6 lens. You'll still have IS available, of course. The 1.4 will give you a 98-280mm f/4 lens.



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Old Jul 13, 2004, 12:35 PM   #5
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I have that lens and the 1.4x Canon TC. Using the TC with that lens gives me results that are not what I would call acceptable. I'm suspecting that my TC is faulty though, the lens itself is great.

Anyone live in Colorado that owns the 1.4 TC by any chance, so I can try yours out before I send mine back to Canon?

Barthold
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Old Jul 13, 2004, 1:35 PM   #6
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FYI this picture was taken with a Sigma 70-200 f/2.8 and its 2xTC, so a 1.4x should be better... (the DOF is paper thin)


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Old Jul 14, 2004, 12:42 AM   #7
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NHL, very cool picture!
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