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| Re: DxOMark reviews Sigma 18-35mm f/1.8 DC HSM Lens |
^ Your math and/or logic is off. f/2.8 is ~1.2-1.3 stops off from f/1.8, not 2.5 stops.
Maybe you meant it lets in about 2.5 times more light?
Technically i mean t-stop. Which is the effective f-stop after factoring light loss due to transmission thru the lens. The 24-70 loses 1.2 stops more light than the sigma. Which means the effective f-stop of the sigma is 2.5 stops of light more than canon 24-70.
If I am shooting the sigma at f1.8 , 1/30 , iso 1600 then to get the same exposure with the canon 24-70, I may shoot f.2.8 , 1/30 , iso 9000.
Nit picking aside, looks like a badass lens. If I shot a crop DSLR, I'd definitely be rocking it. Alas, I'm FF and XE1, so no Siggy for me.