Another Olympus E-M1 and SONY a7 walkabout test, high ISO

Started Jan 29, 2014 | Discussions thread
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quezra
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Re: But that is wrong.
In reply to Lab D, Jan 29, 2014

Why don't you refer to T-stop then, since that is clearly what you're actually talking about.  F-stop is just a ratio of aperture opening to the focal length, it gives you an approximate idea of light gathering but it varies from lens to lens.  Daniel here has actually quite by accident shown how the T1.8 of the PanaLeica is equal to the T1.8 of the FE 55 - when both lenses are wide open (f1.4 vs f1.8), and this is backed up by DxOmark.

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