Even different lenses with the same aperture on the same camera can have decentl... | Hacker News

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		AuryGlenz on June 3, 2020 \| parent \| context \| favorite \| on: Thoughts on cameras in the age of excellent cell p... Even different lenses with the same aperture on the same camera can have decently different t-stops.

dr_zoidberg on June 4, 2020 [–]

Yes, because the f number is a ratio between the effective aperture vs the length of the lens. A long lens with larger f number can focus more light into the sensor than a shorter one with a smaller number, say f/4.0 400mm against a f/2.0 50mm.

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