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

Started Jan 29, 2014 | Discussions thread
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quezra Senior Member • Posts: 3,915
Re: But that is wrong.

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.

 quezra's gear list:quezra's gear list
Sony Alpha 7 Sony FE 55mm F1.8 Sony Vario-Tessar T* FE 16-35mm F4 ZA OSS Sony Alpha NEX-5N Panasonic Lumix DMC-GH3 +10 more
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