npm
Well-known member
Apologies if this is something obvious. I've searched and haven't come up with much.
What is the difference between the Speedbooster EF-M43 "S" mount and the Speedboster Ultra?
This: http://www.metabones.com/products/details/mb_spef-m43-bm2
vs this:http://www.metabones.com/products/details/MB_SPEF-M43-BT4
Thanks for the help.
What is the difference between the Speedbooster EF-M43 "S" mount and the Speedboster Ultra?
This: http://www.metabones.com/products/details/mb_spef-m43-bm2
vs this:http://www.metabones.com/products/details/MB_SPEF-M43-BT4
Thanks for the help.