what function does c1, c2, and off mean on canon f2.8 120-300 mm lense

by Randy Coffman   Last Updated May 05, 2018 15:18 PM

I am using a sigma f2.8 120-300mm lense. how does the c1 and c2 affect pictures and its objective and also the off, 1, and 2 on the on the os feature

Tags : optics

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