Canon, Sigma, Tamron 100-400 spec

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davesurrey Contributing Member • Posts: 982
Canon, Sigma, Tamron 100-400 spec

Hopefully a simple question. What twist angle is needed to go from 100 to 400mm in the Sigma, Tamron and Canon lenses.  In practical use I find this an important spec that doesn't seem to be quoted in the reviews.

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