Question 1

What does the 0.64x Speed Booster XL do to my crop factor on Micro Four Thirds?

Accepted Answer

Micro Four Thirds has a native 2x crop factor. Multiplying that by 0.64x gives you an effective crop factor of approximately 1.28x. That means a Canon EF 24mm lens behaves like roughly a 30mm equivalent — significantly wider than the 48mm equivalent you'd get without the adapter.

Question 2

How much extra light does the Speed Booster XL 0.64x give me?

Accepted Answer

A 0.64x focal reducer concentrates the full-frame image circle onto the smaller MFT sensor, which brightens the image by around two-thirds of a stop. So a Canon EF 50mm f/1.4 behaves roughly like an f/1.1 on the MFT body — a useful gain in low light and for shallower depth of field.

Question 3

What is the difference between the Speed Booster XL 0.64x and the standard Speed Booster Ultra 0.71x?

Accepted Answer

The XL 0.64x has a stronger focal reduction (0.64x vs 0.71x), which means a wider field of view and a slightly larger aperture gain. The XL version is designed specifically to handle the large image circle of Canon EF full-frame lenses with minimal vignetting. If maximum width and light gathering are your priorities, the XL is the one to choose; the Ultra 0.71x is more compact.

Question 4

Which Micro Four Thirds cameras work with this adapter?

Accepted Answer

Any camera with a standard Micro Four Thirds mount works, including Panasonic Lumix G and GH series bodies and OM System (formerly Olympus) OM-D and PEN cameras. As long as your camera uses the Micro Four Thirds mount, the adapter will fit.

Question 5

Is buying a used Metabones Speed Booster XL safe?

Accepted Answer

Yes — lens adapters have no shutter mechanism or sensor to wear out, so the main things to check are the optical element (for dust or haze) and the mount contacts. Every second-hand Metabones adapter at Camera-tweedehands.nl is individually inspected and comes with a minimum 12 months warranty, so you're covered if anything isn't right.

Question 6

Can I use Canon EF-S lenses with the Speed Booster XL 0.64x?

Accepted Answer

It's not recommended. EF-S lenses have a smaller image circle designed for APS-C sensors, while the Speed Booster XL is optimised for full-frame EF glass. With EF-S lenses you're likely to see heavy vignetting or soft corners, and in some cases the rear element may protrude far enough to risk contact with the adapter's optics. Stick to Canon EF full-frame lenses for the best results.

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Metabones Canon EF to Micro Four Thirds T Speed Booster XL 0.64x

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