Discover how Tri-Bahtinov masks can dramatically improve your telescope focusing accuracy. In this video, we explain how these masks work, why they’re essential for astrophotography, and tips for ...

Enhance nighttime viewing with red-light flashlights that protect night vision. Improve telescope focus with a Bahtinov mask for sharper images. Capture celestial photos easily using a smartphone ...

The team behind the NASA gamma-ray burst satellite called Swift has completed construction of a massive “coded aperture mask,” the largest such device ever built, marking another milestone on its path ...

A "selfie" taken by the James Webb Space telescope during the early stages of calibration process. NASA SHARE Focusing a six-ton, $10 billion space telescope isn’t as simple as turning the focus ring ...