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Old Mar 7, 2007, 11:07 AM   #1
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Ok guys. Please tell me the difference between these two lens.

Canon 100-400-f/4.5-5.6 L IS & Canon 400mm/f5.6L USM lens.

Where is the difference here and what, if any is there a difference in quality of picture? thanks alot :?
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Old Mar 7, 2007, 11:12 AM   #2
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Well, the obvious difference is one is a zoom lens and the other is a prime lens fixed at 400mm. Also the prime is slightly sharper.

As I understand from those in the birding community, the 400mm prime is slightly faster to focus (making it a better birds-in-flight lens) and takes a Teleconverter better (i.e. the image quality with a TC is better than the 100-400 athough in both cases you lose autofocus on non 1-series cameras because the non-1 series cameras require f5.6 to autofocus).

So, it's a question of the versatility of a zoom vs. slightly better IQ and slightly quicker focusing of the prime.

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Old Mar 7, 2007, 8:32 PM   #3
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Although the weight difference is not that great the 400mm somehow feels a lot lighter than the 100-400mm, may be because of how the overall weight is spreaded out...

-> Also it's kind of surprising to see how good a Sigma 100-300 f/4 zoom (with a 1.4x) is when compared against a prime:
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Old Mar 13, 2007, 6:46 AM   #4
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Looked at purchasing one of these two lenses and settled on the 400mmas I alreadyhad the 100-300mm focal range covered withthe 70-200 & 300 f4.Also as JohnG mentioned the 400 is slightly shaper, slightly faster AF and takes a 1.4x TC much better.

Have heard there is more variation in sharprness between copies of the 100-400 at the 400mm end.

Here is a fairly old review of the 400 compared to the 100-400 athttp://luminous-landscape.com/review...tten-400.shtml.

It all depends on what you needthe versatility ofthe zoom orthe benefits of the prime. I really like the 400mm itsuited my needs but I can'tcompare it to the 100-400 as I have never owned one.

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