Using Crop Sensor Lenses on A7S II, what happens?

B

Beeboop

Active member
I watched the video below and it explains very well the differences between a full frame sensor and super 35 sensor. Someone here once mentioned that I am losing two stops of light when using a crop sensor lens as opposed to a full frame lens on the A7S II. Is this true for a mirrorless camera? When I attach my sigma 18-35 f1.8 to my A7S, the camera will read f1.7 as the lowest fstop. I recently purchased a Tamron 24-70 f2.8 to use with my A7S II because of this information that was relayed to me in a prior post but now I am second guessing this purchase.

https://www.youtube.com/watch?v=YDbUIfB5YUc
 
Tony Northrup's YouTube video is a little on the confusing side. When he talks about the change in F-stop, he's referring to the effective DOF of the FF lens on an APS-C camera.

In terms of actual shooting speed the F-stop does not change, so a FF f/2.8 lens is still a f/2.8 lens on an APS-C camera, but the effective DOF on the APS-C camera is more like a f/4.2 lens on a FF camera.

I also don't fully agree with his assessment that you won't get sharp images when using a FF lens on a APS-C camera, because the FF lens might resolve much more detail than either the FF or APS-C camera sensors can record, so on either camera you will still get a sharp image.

I would recommend that you try some lenses out ( either rent or go to a camera store with your camera body ) and use your own eyes to judge the results. ( using your video editor )
 
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