http://www.metabones.com/assets/a/stories/SpeedBoosterULTRA_Press_Release.pdf
Still a bit of astigmatism introduced but perhaps as about good as it
gets.
Original white paper-- first design.
http://www.metabones.com/assets/a/stories/Speed Booster White Paper.pdf
Very cool optic, just less compelling with A7R available.
Perhaps wait for the ultra plus? Will think about Ultra for MFT
should it appear.
Mike
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