Metabones Speed Booster

Started Apr 24, 2014 | Discussions thread
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afragisk Senior Member • Posts: 1,292
Re: Metabones Speed Booster

Antone wrote:

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

Yes, you're right, the light does double, increasing by one stop - too late to think straight yesterday.

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Apollon
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Fuji XE-2, Canon FD 300 4L, Fuji 55-200, Fuji 56 1.2, Fuji 27 2.8, Fuji 23 1.4, Fuji 14 2.8, Rokinon II 8 2.8

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