A third party zoom lens may need to be registered with the Speed Booster/Smart Adapter first in order to detect its maximum aperture.External 5V power via micro USB port may be required (not included).Example:a) EF 85/1.2L attached, camera display = f/1.2, physical aperture (lens + Speed Booster combined) = f/0.85.ī) Sigma 18-35/1.8 attached, camera display = f/1.3, physical aperture (lens + Speed Booster combined) = f/1.3. We won’t show f/0.9 with a f/1.2 lens attached, but show f/1.2 instead.
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