I am going to get rid of my Sigma collection (They work, but I want the faster aperature and the clarity of the Canon L) I just want input on what people think about the Canon 100-400 f/4.5-5.6 L IS. Does it still react quickly and let in a lot of light? I shoot alot of wildlife and would use a 2x converter, if so can I use automatic focus or only manual. I usually use manual for all of my sports, but with a monster lens it is tough getting way out there are still getting a crisp photo. I guess that is where the IS hopefully will come in and eliminate the shake even with a tri-pod. I just want the 100-400 for my wildlife and outdoor sports then hopefully get a 70 or 80-200mm 2.8 IS for indoor sports.
I guess I basically want to know if those who own the 100-400 are happy, even on hazing dull days and bright blarring sun shots. It needs to be a lens for all elements.
Thanks for your input,
JR92.
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