35mm f/0.9 for $350 | Tested and Explained: Physics of Speed Booster and Crop Factoring
by Super User, 2 weeks ago.
Jimmy Leak: https://www.instagram.com/_jleak/
The lens opening is determined by the opening of the iris inside of the lens, not by the front element.
In the tests, I should have compensated for the concentration in light with ISO. This explains why the speed booster setup gave a brighter image than other setups in these settings.
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2 weeks ago.