100mm Bahtinov Mask
$28.00
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100mm Bahtinov Mask
$28.00
Precise Focus
Achieve sharp astronomical images always
Universal Fit
Fits dew shields 109 to 145mm
Easy Operation
Clear diffraction pattern feedback
In Stock
Sharp Focus SimplifiedEssential precision astrophotography tool
Achieve flawless focus with the Bahtinov Mask for 100mm Optics, the ultimate tool for crisp astrophotography. Designed specifically for 90-105mm class telescopes, this focus mask eliminates guesswork by producing clear diffraction spike patterns.
Master Astronomical FocusSimple accurate focusing for astrophotographers
Invented by Russian amateur astrophotographer Pavel Bahtinov, the Bahtinov Mask for 100mm Optics provides a fast, reliable, and highly accurate method for acquiring critical focus on stars. By mounting the mask to the dew shield of your telescope setup, bright light sources create distinct linear diffraction spikes. Adjusting your focuser until the central spike sits symmetrically centered between the angled spikes guarantees pin-point star focus for every imaging session.
Technical SpecificationsSizing and compatibility metrics
Aperture Compatibility
90-105mm Telescopes
Dew Shield Outer Diameter Fit
109mm - 145mm
Pattern Type
Bahtinov Diffraction Grid
Primary Application
Astrophotography Telescope Focusing
Optic Class
100mm Refractor / Reflector Accessories
Core CapabilitiesKey features for astrophotography precision
Aperture SupportDesigned for 90mm to 105mm class optics
Dew Shield FitmentFits outside diameters from 109mm to 145mm
Precision Diffraction PatternCreates distinct visual spikes for exact focal alignment
Simple OperationPlace mask, take test shot, center spikes, and begin imaging
Essential Imaging ToolThe standard focusing accessory for astrophotography setups
Frequently Asked QuestionsEverything you need to know
How do I use the Bahtinov Mask for 100mm Optics on my telescope?
Simply place the Bahtinov Mask for 100mm Optics over the front dew shield of your telescope, aim at a bright star, and take a short exposure test image. Adjust your telescope focuser until the central diffraction spike aligns symmetrically in the middle of the 'X' pattern.
What telescope size is the Bahtinov Mask for 100mm Optics designed for?
The Bahtinov Mask for 100mm Optics is specifically optimized for 90-105mm class telescopes and fits dew shields with an outer diameter between 109mm and 145mm.
Why should I use a Bahtinov Mask for 100mm Optics instead of focusing by eye?
The Bahtinov Mask for 100mm Optics converts fine focal differences into clearly visible geometric diffraction spikes, removing subjective visual estimation and ensuring absolute focus precision for astrophotography.