TripleDelta From Croatia, joined Jul 2004, 1052 posts, RR: 7 Posted (7 years 5 months 2 days ago) and read 1633 times:
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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?
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.
Fsgay From United States of America, joined Feb 2005, 23 posts, RR: 0 Reply 2, posted (7 years 5 months 1 day 14 hours ago) and read 1573 times:
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.
TripleDelta From Croatia, joined Jul 2004, 1052 posts, RR: 7 Reply 3, posted (7 years 5 months 1 day 13 hours ago) and read 1563 times:
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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 .
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