Question on using a FF lens in crop mode on A7RIV

Started 3 months ago | Discussions thread
EarthQuake Veteran Member • Posts: 3,077
Re: Question on using a FF lens in crop mode on A7RIV
6

Brian_Smith wrote:

The aperture of a full frame lens remains the same in crop mode.

For exposure, ie: light gathered per mm^2, yes it will always be 1.8.

For total-light-gathering, it will effectively act as a 127/2.8. It will produce the same DOF as an 127/2.8, and similar levels of noise if you were to shoot at 2.8 rather than 1.8.

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