What is 100 200mm on medium format in full frame?

100-200mm on medium format gives the view of 79-158mm on full frame.

The same view on every common format:

• Medium format (44 x 33) (yours): 100-200mm
• Full frame: 79-158mm
• APS-C: 53-105mm
• APS-C (Canon): 49-99mm
• Micro Four Thirds: 40-79mm
• 1-inch: 29-59mm
• 1/1.3-inch: 22-44mm
• 1/1.7-inch: 17-34mm
• 1/2.3-inch: 14-28mm

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.