Question about 400 f/5.6 lens?

Started 6 months ago | Discussions thread
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retired Dog
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Question about 400 f/5.6 lens?
6 months ago

I just received a used EF 400mm f/5.6 lens and being new to Canon I was wondering

what small switch that has 3.5m and 8.5m on it. What does it change and which the

best setting for birding? Thank you. Gary.

 retired Dog's gear list:retired Dog's gear list
Canon EOS 7D Pentax K-3 Sony a6000 Canon EF 400mm f/5.6L USM Sigma 18-50mm F2.8-4.5 DC OS HSM +2 more
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