What is 150 500mm on aps c in full frame?

150-500mm on APS-C gives the view of 225-750mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 285-949mm
• Full frame: 225-750mm
• APS-C (yours): 150-500mm
• APS-C (Canon): 141-469mm
• Micro Four Thirds: 112-375mm
• 1-inch: 83-278mm
• 1/1.3-inch: 62-208mm
• 1/1.7-inch: 49-163mm
• 1/2.3-inch: 40-134mm

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.