1.5x if it’s an APS-C sensor, 2x if it’s a micro 4/3rds, and 1x if it’s full frame (this is most likely if you’re shooting Nikon or Canon, Fujifilm mirror-less

1.5x if it’s an APS-C sensor, 2x if it’s a micro 4/3rds, and 1x if it’s full frame (this is most likely if you’re shooting Nikon or Canon, Fujifilm mirror-less are APS-C, Panasonic et al are m4/3)