Astronomy Plus Bahtinov mask

The Bahtinov mask is a precision focusing aid designed for telescopes and astrophotography setups. It produces a diffraction spike pattern on bright stars, allowing users to achieve accurate and repeatable focus in seconds. The mask is supplied in multiple size variants to match different telescope aperture diameters or dew shield outer dimensions, making it suitable for a wide range of optical tubes and imaging systems.

Technical Specifications 

Specification	Details
Product Type	Bahtinov focusing mask
Function	Optical focusing aid using diffraction spikes
Application	Visual observation and astrophotography
Compatibility	Refractor, reflector, and catadioptric telescopes
Fit Method	Sized by telescope outer diameter / dew shield
Size Variants	Multiple OD ranges to match different telescopes
Material	Lightweight plastic or laser-cut polymer (varies by version)
Mounting	Clamp-on / screw or strap-based attachment depending on variant
Feature	Produces central diffraction spike alignment for precise focus
Use Case	Bright star focusing for imaging and visual setup

In the Box

• Bahtinov focusing mask (selected size variant)
• Mounting hardware (screws / clips / straps depending on model)
• Protective packaging or storage sleeve

Warranty

Astronomy Plus limited Warranty