long telephoto lenses???

i think were all a bit tired.
the sigma I mentioned is a 100-300 F4
the canon mentioned is a 100-400 f4.5-5.6L IS

As lenses get faster (larger maximum apertures) they physically contain more glass, need more design corrections, and correspondingly become more expensive. Also, as you reach the extreme ends of wide angle and telephoto, they become more expensive as well.

Mark

kool..thanks mark

how well does the TC and 70-200mm work out?It sounds like a pretty common set up for ppl.

so at this point i'm considering the canon 100-400 f4.5-5.6L IS

Man, does this sound like an opportunity for the TOKINA AF 80-400mm f/4-5.6 ATX

This baby is not nearly as expensive as any of the Canon's, but can deliver the goods for around $498.00. It may not have IS, but I would give it a good look before you go buying into 300mm or the 100-400mm. If you use a good monopod, IS is pointless, anyway.

If I hadn't sunk $1700 into the Canon EF 70-200mm f/2.8L IS USM and another $900 into the TAmROn SP AF 200-500mm f/5-6.3 Di LD lenses... this would be the one I'd have. A lot smaller and weighs a carload less. I wish they made it in a SONY/Minolta mount... but it's just Canon and Nikon mounts, right now.

Use the money you'd save on some other nice glass. Just a suggestion...

i shoot hend held most of time...monopod might be an option, i iwll definalty look into that Tokina lens, thanks for the tip. HAve to search for photos from it

Check outTHIS LINKthat has been running, recently. It has some nice comparisons in it. Well worth the look, for that kind of savings.

100-400L is a great lens for your application