Lens Magnification Calculator

Calculate lens magnification and focal length relationships.

Macro Setup

Focal Length (mm)

Focus Distance (m)

Sensor Width (mm)

FF: 36, APS-C: 24, MFT: 17

Reproduction Quality

Reproduction Ratio1:4.0

Magnification0.25xFactor of real size

Field Width144.0mmMax real width captured

Real field width is calculated by dividing sensor width by the magnification factor. This tells you the smallest object that can fill the width of your frame.

Overview

Lens magnification depends on focal length and object/image distances. Magnification = image size / object size. Essential for microscopy, photography, and optics design.

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Pro Tips

M > 1 = magnified; M < 1 = reduced.
Negative M = inverted image.
Macro lenses: M = 1 (life-size) or greater.
Telephoto lenses magnify distant subjects.

Fun Facts

"Human eye magnification: ~0.3× (objects appear smaller)."
"100mm macro at minimum focus: 1:1 magnification."
"Microscope: 40×-1000× typical magnification."
"Telescope magnification = focal length / eyepiece focal length."

Formula: M = Image Distance / Object Distance = -di/do

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