Best Lens out there
I've been a photographer for about 14 years now, I've heard people talk about it, I've rented it... and all I can say is that it's if not the best, one of the best lenses out there.
The focal speed on this thing is lightning, even when paired with the 1.4x II extender, you loose an F-stop, but it's doesn't degrade your photos at all, still sharp and fast. If you pair it up with the 2xII extender, you get a whooping 600mm (on a full frame camera like the 5d mark II) at 5.6, and it's still sharp (good when you've got a lot of sun though).
With the IS, I can say that you can actually hold it for periods up to a few minutes without a tripod, after 20 minutes without a mono or tripod, it starts to get heavy. Obviously everyone has their own tolerances.
It took me a few years to save up to buy this baby cash, it's not cheap, but I guarantee you 2 things, 1) superb imagery, 2) just about anywhere you go, at least one person will point and say something about the lens... it's definite presence when you show up.
I showed up at a museum in Florida with a rental of this lens, there were many people photographing, and it was permitted to photograph for non-commercial purposes, the guards asked me to stop photographing because they didn't believe I was there as a tourist...lol
I'd say the only down side to this lens is I didn't buy it sooner, this is a must for people that want results!
James DonohueRead full review