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Cons: There are three things with this lens I don\'t really love: #1. its tendency to move the center of gravity forward as you zoom in on a bird making the foot too short, unless you have a very beefy camera, say a D5. #2. Its heavy lens-shade, that is so rigid that if the lens would be dropped, nose down, onto a stone floor, I am sure the lens-shade will be OK, but not so sure about the rest. #3. Weight. None of the other 150-600 lenses on the market are as heavy, not even the the 60-600 S, which is even better!

Pros: Very weather-resistant, fast-focusing, confidence-giving, and durable.

Summary: A lens to be used, and used again, if maybe not carried around day long, as it is BIG, and not a little front-heavy. I have used mine for years, and not a single issue, not even a speck of dust inside, in sharp contrast to my newer 100-400 C, while its sharpness isn\'t far behind, it definitely is NOT dust-proof. The 60-600 S is the lens it should be compared to, and that is, according to all sources I have, a step up in every way, and it also has a macro mode, imagine that. And a 10x zoom, who would mind that?!

Cons: Just the weight only, but a high build quality requires it. Sure, according to the photozone- test, the extreme corners are a little bit softer, but for nature photography like birds is it not objectionable.

Pros: Excellent mechanical and build quality. Due to the very effective optical stabilizer handheld operation is possible even at lower shutter speeds. The impressive hood is included and made of metal, not a yoghurt-cup for 100€ extra.

Summary: I do not regret my decision to get that lens. In earlier times Sigma was not well known for quality but this has changed dramatically for the last years. It compares well with the L-class- lenses form Canon

Cons: The only exception that can be raised in relation to this lens is that you need to get used to the weight of this lens. However, this is not a serious problem for a lens that offers so much quality and 600mm optical zoom. With it, always use the monopod and this greatly facilitates things.

Pros: Excellent build quality. Excellent optical quality. The details obtained, in all distances, including in 600mm, are impressive. The focus accurately on my Nikon camera is absolute and it´s fast too for a supertelephoto. A lens that can be programmed and updated easily. A really fabulous design.

Summary: A really professional lens. For those who are dedicated to photographing seriously, it is an efficient, reliable lens and did not disappoint the discerning photographer.

Cons: It is rather large and heavy.. But that is to be expected at 600mm and I was able to hand hold it with no issues. The minimum focus distance leaves a bit to be desired when compared to the Canon 100-400mm

Pros: Excellent build quality, 600mm wide open is very sharp even handheld. stabilization is quite effective, I quite like the push pull.

Summary: Loving this lens so far. I have put up a full review with a bunch of sample images of Australian wildlife.. Enjoy :) http://www.davidromaphotography.com/blog/2014/12/sigma-150-600mm-f5-6-3-dg-os-hsm-sport---australian-hands-on-review-with-sample-shots