Bahtinov Focus Tool for DSLR Camera Lens Size:80 - 120 mm Adjust focus until the middle

Adjust focus until the middle spike is centered

Never worry about focus again

This inexpensive tool creates predictable diffraction spikes in your image

or deep-sky imaging

The mask will diffract the light into three spikes

Bahtinov Focus Tool for DSLR Camera Lens Size:80 - 120 mm Adjust focus until the middleNever worry about blurry stars again. Get perfect focus for astrophotography every time with a bahtinov focus tool. If you've ever spent hours trying to manually focus your camera on the stars at night, you know the struggle. A bahtinov focus tool will cut your setup time down to mere minutes with ease. The simplest, easiest to use Bahtinov Focus Tool for camera lenses. Clips to the Exterior of the Lens The tool clips to the exterior of the lens,