DIY Electronic Microfocuser

When imaging targets using a DSLR lens, achieving proper focus may be difficult even when using a Bahtinov mask. Focus adjustments involving very small and precise steps can be achieved using a microfocusing mechanism. In this DIY project, I have modified a Canon 50 mm f/1.8 lens and tapped onto its built in electronic microfocuser.

The focuser is ASCOM compliant and works with astronomy software such as the Nighttime Imaging N Astronomy (NINA) for automated focusing during unattended imaging. It runs on the firmware developed by R. Brown (2021). The modification should work with any lens with built in electronic focusers. To watch a demo video about this microfocuser project, click here.

To view posts on DIY projects and astronomical equipment, click here. To get a copy of the sketch, please email

Related link: DIY Electronic Automatic Focuser for Telescopes

Night Sky in Focus | Astronomy and Amateur Radio
© Anthony Urbano | Manila, Philippines

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