A Bahtinov focusing-mask will save you time for other things

An essential focusing-tool for your journey to the beginning of the universe. Photos courtesy of Bahtinov.

Achieving perfect focus can be time-consuming and difficult without a focusing mask to help you
One of the toughest things to achieve when trying to take timeless pictures during your journey to the beginning of the universe will be getting a sharp focus on your time-machine-to-the-stars. Professional astronomers...