Ebay is recently flooded with EF to EOS M speedboosters.
Made to poorest standards and not having any electronics inside they are probably a step backwards....
But they show it can be done. Why is no real fine optics company jumping on the train to build a quality speedbooster with full lens feature support?
Made to poorest standards and not having any electronics inside they are probably a step backwards....
But they show it can be done. Why is no real fine optics company jumping on the train to build a quality speedbooster with full lens feature support?