Kenko Night Focus φ82mm, Star Focusing Tool for Astro Photography, Made in Japan

It is difficult and time-consuming to precisely focus on the stars when taking a starry landscape photograph.
You may have experienced that you took the trouble to take a picture, only to find out later that the stars were out of focus and the picture was ruined.

The Kenko Night Focus is a filter-type focusing tool that allows you to easily and accurately focus on a star.
It attaches to the front of the lens like a regular screw-in filter.
The pattern on the glass surface generates three light stripes from a star's point source, and by adjusting the focus so that the intersection of the three stripes overlaps, you can precisely focus on the star.

The Bahtinov Mask is a well-known focusing tool for astronomical observations, but the Bahtinov Mask is intended for use with telescopes with a focal length of 500-1000mm.
The Night Focus, on the other hand, is designed for use with focal lengths of 24-70mm and f-stop values of 2.8-4, which are frequently used in stargazing, and thus allows for effective photography that is suited to modern cameras.
In addition, the optional item “Kenko Square Conversion Frame for ø82mm”, and your existing square filter holder can be used together for smooth filter attachment and removal before and after focusing on the stars.

Precautions for use:
■This product is designed for use with the following equipment.
・Camera: Camera with live-view function
・Lens: 24-70mm focal length / F2.8-4 zoom lens or 20-50mm focal length / F2-2.8 single focal length lens

■This product is an auxiliary tool for focusing on stars. Remove the product from the lens when you are finished focusing.

■This product is designed for use with lenses with focal lengths of 24-70mm and F2.8-4. It may not be fully effective when used with lenses of other focal lengths and brightnesses.