magnification ratio; magnification power
Technical term used in optics, photography, microscopy, and similar fields to express how much an image is enlarged relative to the original.
The magnification power of this microscope is up to 1000x.
Please check the magnification ratio when printing the photo.
character expansion factor
Compound of 拡大 (kakudai, 'enlargement') and 率 (ritsu, 'rate').