This lens has an excellent range for birds and wildlife, it appears well-built, and it focuses quickly on still subjects. It could be a real bargain for someone who doesn't use it on a tripod. The tripod collar's foot is very short, apparently not very strong, and there is only one point of support.

JUST GOT THE LENS...SET IT UP ON TRI-POD IN STUDIO..TEST SHOTS IN ALL MM RANGE..SHOOTING MANUAL .. NOT RAW FILES, BUT 24.MEG FINE...SO FAR SO GOOD..LENS LOOKS TO BE WELL MADE..FEELS GOOD IN HAND...i find it interesting the spec sheet says DO NOT USE VIB-REDUC IF MOUNTED ON TRI-POD..

I bought it for my Nikon d7100 but when I use it, one minutes it was good but next minutes it suddenly tells me the lens connection is failed. It's really panic, I have to return it.

For the price, this lens is an absolute star. Light enough for hand-held use throughout the day (though it will build your muscles!) it focuses quickly and produces wonderful shots. Mine is used mainly for airshow photography, including magazine work, and the results have been wonderful.

I have had this lens for a few days now. So far I am loving it. I have posted a full review on my blog with a bunch of sample images with 100% crops of Australian Wildlife.

Build quality

Bulky

As it has been mentioned in number of reviews all over internet the lens proves its abilities without iota of doubt. Here are my observations about the lens which has been used for 24 hours since purchase. 1. Silent focusing motor.

This one I bought it from snap real after lot of research and comparing prices at various portals I am very satisfied with the product and fast delivery

This is a very popular lens for our bird photographers, although it is not for the faint hearted and you will need to consider a tripod/monopod.

Received mine and I Immediately make Test Shots at 600mm. Very Sharp for Wildlife Shooters,the OS is Very Good also. I'm Very Happy with it so far!

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I am extremely happy with lens. I have taken practice shots and the photos are outstanding. I love it!