10-10-2020 08:52 AM
I just bought a brand new Canon 100-400 4.5-5.6 MK2. I have just put it on my Canon 6D. I am only getting F5.6 and not F4.5. Is there any setting i need to change?
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10-10-2020 10:21 AM
Keep in mind a variable aperture lens is not its most wide open aperture 1mm below is shortest FL, 101mm in your case. It is a gradual decline for sure but a decline never-the-less.