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Abbreviation: HSM = "Hyper-Sonic Motor" (Sigma)

The abbreviations means "Hyper-Sonic Motor"

Explanation from Sigma

This lens uses a motor driven by ultrasonic waves to provide a quiet, highspeed AF.

See examples of effected products

Sigma EX 70-200mm f/2,8 APO HSM DG OS
Sigma 50-200mm f/4-5,6 DC OS HSM
Sigma EX 120-300mm f/2,8 APO DG HSM

See links

sigmaphoto.com

Lenses for Canon

Here are a few popular alternatives (see all)

Canon EF 50mm f/1,8 II
Canon EF 50mm f/1,8 II
Canon EF 600mm f/4 L IS II USM
Canon EF 600mm f/4 L IS II USM

Lenses for Nikon

Here are a few popular alternatives (see all)

Sigma EX 70-200mm f/2,8 APO HSM DG OS
Sigma EX 70-200mm f/2,8 APO HSM DG OS
Nikon AF-S 400mm f/2,8 E FL ED VR
Nikon AF-S 400mm f/2,8 E FL ED VR

School

Our articles will educate you (see all)

  • Tripod Mounts
  • Protect your lens with a filter
  • Buy a new or a used lens?
  • Importance of autofocus motor
  • Cleaning a lens

See lenses for your camera

Below you will find some models (see all)

Canon EOS D30

Canon EOS D30
Nikon D3300

Nikon D3300
Nikon D50

Nikon D50

Newly added lenses

Nikon AF-S 600mm f/4 E FL ED VR

Nikon AF-S 600mm f/4 E FL ED VR
Nikon AF-S 500mm f/4 E FL ED VR

Nikon AF-S 500mm f/4 E FL ED VR
Nikon AF-S 200-500mm f/5,6 E ED VR

Nikon AF-S 200-500mm f/5,6 E ED VR

Two popular lenses to look at

Canon EF 400mm f/2,8 L IS USM

Canon EF 400mm f/2,8 L IS USM
Sigma EX 70-200mm f/2,8 APO HSM DG OS

Sigma EX 70-200mm f/2,8 APO HSM DG OS
Canon EF 28-135mm f/3,5-5,6 IS USM

Canon EF 28-135mm f/3,5-5,6 IS USM

Recently visited lenses

Sigma EX 8mm f/3,5 DG Fisheye

Sigma EX 8mm f/3,5 DG Fisheye
Sigma EX 4,5mm f/2,8 DC HSM Fisheye

Sigma EX 4,5mm f/2,8 DC HSM Fisheye
Nikon AF-S 24-70mm f/2,8 E ED VR

Nikon AF-S 24-70mm f/2,8 E ED VR

Recently visited cameras

Canon EOS 1100D

Canon EOS 1100D
Canon EOS 5D Mark II

Canon EOS 5D Mark II
Canon EOS 1Ds Mark III

Canon EOS 1Ds Mark III

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