Metabones Speed Booster

Started Apr 24, 2014 | Discussions thread
Antone
Antone Senior Member • Posts: 1,139
Re: Metabones Speed Booster

afragisk wrote:

Also light doesn't double.

It concentrates the amount of light leaving the lens that effectively gives twice as much light striking the sensor. The 0.71x factor of the adapter is what causes this doubling [log(0.71^2)/log(2) = -0.99]. It's the same reason most companies make 1.4x teleconverters (0.97 stop loss) instead of 1.5x (1.17 stop loss) teleconverters.

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Tony-S

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