Sigma 18-35mm f/1.8 FX equivalent

Started 9 months ago | Discussions thread
SushiEater Forum Pro • Posts: 11,347
Re: Math

MediaArchivist wrote:

SushiEater wrote:

MediaArchivist wrote:

SushiEater wrote:

threw the lens wrote:

18-35mm f1.8 lens on APS-C is like a 27-53mm f2.8 lens on FF.

Wrong, Wrong and Wrong!!!! Stop spreading misinformation.

It's math, how is it wrong?

A F1.8 lens is always F1.8 lens regardless which camera it is attached to.

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. F1.8 lens gathers over a stop more light than F2.8 thus allows higher shutter speed.

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