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TripleDelta
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Sticking An Extender Onto A EF 70-200 F/4

Fri Dec 23, 2005 5:47 am

I have a little question regarding the usage of extenders. Namely, I have a 20D with a 70-200 F/4 L as my "long" lens. In the majority of cases, the 200 mm gives enough zoom, but sometimes a few mm more wouldn't hurt.

A separate, good-quality lens in the 300-400 mm range is way too expensive for the amount of shooting I, for now, expect to do with it, so I'm looking at an extender. I'm leaning toward the 1.4x, effectively giving me a 98-280 mm lens if I did the math okay, which isn't at all bad.

In this post, the 70-200 F/2.8 with the 1.4x came out quite well, but what about the F/4?
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sulman
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RE: Sticking An Extender Onto A EF 70-200 F/4

Fri Dec 23, 2005 6:01 am

I've been very happy with it:


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Slightly slower AF (very slightly slower) and you lose a stop, plus you've working at nearly 300mm at the long end with no IS, so steady hands required, but it's a great bit of kit.


James
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fsgay
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RE: Sticking An Extender Onto A EF 70-200 F/4

Fri Dec 23, 2005 3:46 pm

I have this combo on my 10D. All else being equal, and as said before, the AF speed is very slightly slower, and its never particularly awesome to hand hold a nearly 300mm lens. However, I find that, since I have to shoot at a maximum of f/5.6 (especially at ISO100 or 200, where I usually shoot, to avoid noise), I limit myself to shooting with the extender only in situations where the light is bright enough for the decreased aperture, which, consequently, usually means your shutter speeds are high enough to not cause any problems, even sans-IS, and also that the AF has plenty of light anyway, and doesn't really seem to lag. For reference, the following shot was number 6-ish in a series I took of an AF A343 landing on 22L at BOS. It was very near sunset at the time, and every one of the shots is in focus (I was in AI Servo mode), and free of motion blur.


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TripleDelta
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RE: Sticking An Extender Onto A EF 70-200 F/4

Fri Dec 23, 2005 4:45 pm

Thanks for the replies guys.

I thought that the lack of IS would be a problem, but it's no big deal, and with a little practice the problem could be reduced. The slower AF won't be much of a problem as well, judging from the pics, since anyway, an object far enough to require 280 mm can be tracked long enough for the AF to do the work. And, again with some practice... time to add the extender to my wish list  biggrin .
No plane, no gain.
 
sleekjet
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RE: Sticking An Extender Onto A EF 70-200 F/4

Sat Dec 24, 2005 9:21 am

Before I acquired the 100-400, I used the 70-200 f/4 with a Sigma 1.4x. Very, very pleased with the results.
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andrewuber
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RE: Sticking An Extender Onto A EF 70-200 F/4

Sat Dec 24, 2005 1:08 pm

Just don't try to stuff a 2.0x on the end of the 70-200 F4 L. Norman Camera told me it could be done - and maintain autofocus - but it didn't.

Anyone wanna swap a 2.0 for a 1.4 or 1.6???

Drew
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