Sigma 18-35mm f/1.8 FX equivalent

Started 9 months ago | Discussions thread
MediaArchivist Veteran Member • Posts: 5,474
Re: Math

SushiEater wrote:

MediaArchivist wrote:

Not is, but is like. On a crop sensor, f/1.8 is like f/2.8 on a FF sensor. It has to do with both DoF and light gathering capability.


Wrong. I mean right. I mean "wrong" is wrong, thus in fact right.

F1.8 lens gathers over a stop more light than F2.8

All things being equal, of course. But... all things are not equal if the total area of the sensor gathering the light are not equal (or the focal length is not equal, or other things are not equal).

thus allows higher shutter speed.

[sigh] Hasn't this issue been thoroughly and pedantically presented, discussed, and agreed upon quite some time ago?

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