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Forums > Back > Sigma 70-200 OS HSM review
#5
[quote name='Vieux loup' timestamp='1304332666' post='7996']

I admit my ignorance of this issue. Can someone explain to me what it really means in technical terms and what it means for taking pictures every day! Thanks in advance!

[/quote]

The more descriptive name for it I prefer is "focal length shrinkage" at close® focus distances. Depending on the design of the lens, the focal length of the lens may reduce from nominal as you focus closer. If you shoot a lot at closer distances, just be aware the actual focal length may be less than you think, with consequent effects.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
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Messages In This Thread
Sigma 70-200 OS HSM review - by mehigh - 05-01-2011, 10:21 AM
Sigma 70-200 OS HSM review - by mst - 05-01-2011, 10:28 AM
Sigma 70-200 OS HSM review - by Brightcolours - 05-01-2011, 02:36 PM
Sigma 70-200 OS HSM review - by Steinar1 - 05-02-2011, 10:37 AM
Sigma 70-200 OS HSM review - by popo - 05-02-2011, 11:34 AM
Sigma 70-200 OS HSM review - by Brightcolours - 05-02-2011, 01:50 PM

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