Effect of lens on the exposure metering

by Brandon   Last Updated April 15, 2018 20:18 PM

Last weekend I was shooting in studio and tethering to laptop as well. First I measured everything and shot the portrait with a 24-70mm lens at f/2.8 Then I switched to 85mm lens and didn't change anything and made sure I am still at f/2.8 and shot the same thing. But on laptop screen I noticed the light on the background seemed to be increased! But I didn't change anything, I just changed lenses. So that made me think does the length of the lens affect the exposure even in these short lenses? When I do Large Format photography the length of bellows affects the exposure but hadn't seen such a thing for digital.

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