What is 32 64mm on medium format in full frame?

32-64mm on medium format gives the view of 25-51mm on full frame.

The same view on every common format:

• Medium format (44 x 33) (yours): 32-64mm
• Full frame: 25-51mm
• APS-C: 17-34mm
• APS-C (Canon): 16-32mm
• Micro Four Thirds: 13-25mm
• 1-inch: 9.4-19mm
• 1/1.3-inch: 7-14mm
• 1/1.7-inch: 5.5-11mm
• 1/2.3-inch: 4.5-9mm

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.