What is 16 50mm on canon aps c in full frame?

16-50mm on APS-C (Canon) gives the view of 26-80mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 32-101mm
• Full frame: 26-80mm
• APS-C: 17-53mm
• APS-C (Canon) (yours): 16-50mm
• Micro Four Thirds: 13-40mm
• 1-inch: 9.5-30mm
• 1/1.3-inch: 7.1-22mm
• 1/1.7-inch: 5.6-17mm
• 1/2.3-inch: 4.6-14mm

Crop factors are by the sensor diagonal, rounded as they're usually quoted; a format with a different shape (4:3 against 3:2) frames a little differently across the width. More in the focal length converter.

Computed from the sensor sizes, not written by a model.