Extension Tube Magnification Calculator

Calculate magnification increase when using extension tubes for macro photography.

Linear measurement in the specified unit.
mm
Linear measurement in the specified unit.
mm
Enter the lens base magnification value for this calculation.
x

Results

Added Magnification:
Calculated added magnification based on your inputs.
-x
Total Magnification:
Sum of all calculated values.
-x
Light Loss:
Calculated light loss based on your inputs.
-stops
Effective Aperture at f/4:
Value expressed as a rate (per unit).
-f-stop
Reference: Industry Standards.