Eoin Healy

Timely article Andrew. I believe the Metabones XL only increases aperture by 1 & 1/3 stop, not the one and half stop faster F-stop you mention in the article. In terms of 35mm equivalent focal length, I get that a Canon EF 70-200mm f/2.8L would become an effective 90-256mm on a standard MFT camera with XL adapter, but what about an APSC lens like the Sigma 18-35mm f/1.8 DC HSM? B&H claim this lens has a 35mm Equivalent Focal Length of 28.8-56mm so is there more to calculate the 35mm equivalent when used on MFT with XL adapter?