Birds EF100-400 with Vitrox Speed booster - bird photography

[ctitanic]

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[Only RF]

I looked it up but I didn't find much info. What does a speed booster actually do?

 

[ctitanic]

I looked it up but I didn't find much info. What does a speed booster actually do?

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.

 

[ctitanic]

Here is a video that explains it better

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I have the version for RF so it converts from EF to RF.

 

[Only RF]

Thanks