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Difference between original Speed booster and the Ultra 0.71x


amsh89es335

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Hi what is the difference between the original Metabones Nikon G to Micro Four Thirds Speed Booster and the newer Metabones Speed Booster Ultra 0.71x Adapter for Nikon F-Mount Lens to Micro Four Thirds-Mount Camera?

Was there any improvement added to the class or mounts with the newer one? 

Looking to buy one used. 

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The optical design was updated for the Ultra, and I believe it uses a better quality of glass as well. The designer is actually on this board, Brian Caldwell. Maybe search for his username and you can find his older posts where he explains the exact differences.

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  • 1 month later...
On 6/18/2018 at 8:38 AM, amsh89es335 said:

Hi what is the difference between the original Metabones Nikon G to Micro Four Thirds Speed Booster and the newer Metabones Speed Booster Ultra 0.71x Adapter for Nikon F-Mount Lens to Micro Four Thirds-Mount Camera?

Was there any improvement added to the class or mounts with the newer one? 

Looking to buy one used. 

The Ultra uses a significantly better optical design, with very high MTF and insignificant corner falloff.  As a result, the Ultra will sharpen up any lens that is attached to it, including the Zeiss Otus series.  Below is a very detailed MTF comparison of the original M43 Speed Booster, the Ultra, and the XL.  The XL is also very sharp, but is a little more specialized than the Ultra.

 

BC09_BC22_BC25_MTF_Comparison.png

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