Lens speed vs IQ

Started 6 months ago | Discussions thread
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Lens speed vs IQ

Someone said that for a slower lens to have the same IQ as a faster lens, stop-for-stop, that the slower lens would have to be essentially the same as the faster lens artificially held back.

For example, a 50 / 2 that had every bit the IQ as the Sigma 50 / 1.4A, stop-for-stop, would necessarily be the same size and weight as the 50 / 1.4A.

Is this so?

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