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<blockquote data-quote="Pierro" data-source="post: 91688" data-attributes="member: 8517"><p>Maxie - Sigma made more than one model of the 150-500. You definately want the OS HSM version. OS is the same as Canon IS , Nikon VR and Tamron VC and these are all stabilised lenses. HSM is Hypersonic Motor and is Sigmas answer to modern AF focusing drive using Ultrasonic Oscillation</p><p></p><p>AS for your choice of lenses for your chosen subject, 300mm would be ok but its slow at full tele, so if a slow lens is your budget, you may as well get the Sigma, but the weight increases. Depends if you're intent is to hand hold or use a tripod. You can hand hold the big Sigma for a while but it will get tiring very quickly. The Sigma will aslo double up as a birding lens, whereas the 70-300 will be too short unless you shoot Ostriches</p><p></p><p>Any teleconverters on any of these lenses will give poor results.</p></blockquote><p></p>
[QUOTE="Pierro, post: 91688, member: 8517"] Maxie - Sigma made more than one model of the 150-500. You definately want the OS HSM version. OS is the same as Canon IS , Nikon VR and Tamron VC and these are all stabilised lenses. HSM is Hypersonic Motor and is Sigmas answer to modern AF focusing drive using Ultrasonic Oscillation AS for your choice of lenses for your chosen subject, 300mm would be ok but its slow at full tele, so if a slow lens is your budget, you may as well get the Sigma, but the weight increases. Depends if you're intent is to hand hold or use a tripod. You can hand hold the big Sigma for a while but it will get tiring very quickly. The Sigma will aslo double up as a birding lens, whereas the 70-300 will be too short unless you shoot Ostriches Any teleconverters on any of these lenses will give poor results. [/QUOTE]
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