<<Metabones Speedbooster Ultra: the one to beat. Unfortunately, the one to beat
<<on price, as well.
Should at least look at the Speedbooster M43 XL version which is 0.64X and gets
the crop factor down to 1.28 X vs 1.42X with the ultra. Unfortunately it is
not recommended for use with E-M1 Mk2. Bah.
https://www.dpreview.com/forums/thread/3880724
The MTF of most lenses actually IMPROVE with either, the way these things work
though more so with the Ultra at the price of more crop factor.
https://www.metabones.com/assets/a/stories/Speed%20Booster%20White%20Paper.pdf
Mike
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