What is 16 35mm on aps c in full frame?

16-35mm on APS-C gives the view of 24-52mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 30-66mm
• Full frame: 24-52mm
• APS-C (yours): 16-35mm
• APS-C (Canon): 15-33mm
• Micro Four Thirds: 12-26mm
• 1-inch: 8.9-19mm
• 1/1.3-inch: 6.7-15mm
• 1/1.7-inch: 5.2-11mm
• 1/2.3-inch: 4.3-9.4mm

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.