Macro Extension Tube Calculator
Lens Focal Length
(in millimeters)
Minimum Focus Distance
(in centimeters)
Magnification at M.F.D.
(as documented, e.g. 0.25 or 1:4)
Maximum Lens Aperture
(third stops)
Minimum Lens Aperture
(third stops)
Macro Extender Set
(select manufacturer)
Camera
(select model)
Output Size
(select size of print)
Metric?
(uncheck for feet and inches)