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Birds EF100-400 with Vitrox Speed booster - bird photography
- Thread starter ctitanic
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I looked it up but I didn't find much info. What does a speed booster actually do?
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You gain one stop of light and change the crop factor by 0.71, that means that
400 x 1.6 = 640
640 x 0.71 = 454
454 is closer to the original value of 400.
In another words, it makes EF lenses to behave in an ASP-C camera almost in the same way as in a full frame camera and gaining some light in the process.
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Thanks
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