Please use this tool cautiously. The close focus when using a macro extension tube can vary based on unique design of the taking lens. The results produced by this tool can be +/- 10%. This means that a distance can be off by several inches in certain cases. Please contact us if you have any issues using this tool or have any recommendations for updates.

Macro Extension Tube Calculator

New Close Focus Distance:
New Far Focus Distance:
New Total Focus Range:

Imperial to Metric Conversion

If needed, convert feet and inches to millimeters to use the calculator above.
(Use feet in decimal format or combine feet and inches.)

Distance in mm: