Have a question, feedback or a feature request for LensMath? We would love to hear from you.
Email us at: mubeen.icit@gmail.com
We aim to respond to all technical inquiries and feedback within 24-48 hours.
Reporting a wrong result
If a result looks wrong, please include these details so we can check it quickly:
- Your lens focal length and aperture
- The booster or teleconverter ratio
- Your camera model or crop factor
- The result you saw and the result you expected
To learn how the numbers are calculated first, read the guide to speed booster effective aperture or visit About LensMath.