The Sigma 150-500mm has an average review score of 72%

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Sigma 150-500mm f/5-6.3 DG OS HSM
What Digital Camera reviews the Sigma 150-500mm f/5-6.3 DG OS HSM lens
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84

Sigma 150-500mm f5-6.3 DG OS HSM
The ‘DG’ after the Sigma’s name indicates that it can fit both 35mm film cameras and DSLRs. The ‘OS’ stands for Sigma’s own Optical Stabiliser technology, which uses moving elements within the lens to counter camera shake. The ‘HSM’ stands for Sigma’s HyperSonic Motors, which are used for autofocus. On a 35mm or full-frame SLR, you’d call the Sigma a medium-long telephoto. On a non-full frame digital SLR, though, it equates roughly to ...
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60