What is 17 50mm on canon aps c in full frame?

17-50mm on APS-C (Canon) gives the view of 27-80mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 34-101mm
• Full frame: 27-80mm
• APS-C: 18-53mm
• APS-C (Canon) (yours): 17-50mm
• Micro Four Thirds: 14-40mm
• 1-inch: 10-30mm
• 1/1.3-inch: 7.6-22mm
• 1/1.7-inch: 5.9-17mm
• 1/2.3-inch: 4.9-14mm

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.