Photographer Christopher Frost published another interesting review of an old zoom telephoto lens which is still very much unique in it’s class – the Sigma 300-800mm f/5.6 EX DG HSM also called (unofficially) Sigmonster.
Sigma has been known to create several huge zoom lenses over the years – maybe the most famous one was the humongous 200–500mm f/2.8 EX DG (a.k.a “Sigzilla”) whith its unique green coating and very wide aperture. A different Sigma “monster” zoom lens is the 300-800mm f/5.6 EX DG HSM which Frost looks at in this video.
The 300-800mm f/5.6 EX DG HSM is quite old, it was introduced about 10 years ago, has no image stabilisation system and weighs close to 6kg/13lbs. It is also very expensive at about $7500 (although compared to the price of the new 800mm Nikon/Canon lenses it can be considered a bargain).
According to Frost – there is no chance to shoot with this handheld, build quality is good and is quite sharp (especially if you stop down to f/8), although not on the level of the advanced Canon/Nikon 800mm lenses.
Another Sigma zoom monster – the huge sigzilla – Sigma 200–500mm f/2.8 EX DG (as we shot it during Photokina 2012)
You can find many more previews and reviews on our Photography review section here on LensVid and you can find more of Frost’s videos here on LensVid.
Iddo Genuth 
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Why should you trust us?
Clickbaity. Article/video is about the 300-800, but uses a thumbnail of the 200-500/2.8, presumably because its more ridiculous-looking.