600 F5.6 DO

Started 2 months ago | Discussions thread
OP H2ODoctor Regular Member • Posts: 319
Re: 600 F5.6 DO

I know how to calculate the effective focal length when cropping but am unaware of how to calculate the effective F value.  Please share that information with me.

 H2ODoctor's gear list:H2ODoctor's gear list
Canon EOS 7D Mark II Canon EOS 5D Mark IV Canon EF 50mm F1.4 USM Canon EF 400mm f/5.6L USM Canon EF 17-40mm f/4.0L USM +5 more
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