120mm Bahtinov Mask
$32.00
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120mm Bahtinov Mask
$32.00
Accurate Focus
Achieve crisp star patterns quickly
Broad Fitment
Fits 120 to 152mm shields
Astro Essential
Fits 105 to 125mm optics
Pinpoint Astrophotography FocusMaster optical clarity effortlessly
The Bahtinov Mask for 120mm Optics is an essential focusing tool designed for amateur and experienced astrophotographers. By placing this high-precision mask over your telescope, you can quickly achieve razor-sharp star focus using distinct diffraction spike patterns.
Stellar Imaging PrecisionEliminate focusing guesswork on stars
Achieving critical focus in optical astronomy can be challenging, but the Bahtinov Mask for 120mm Optics removes all the trial and error. Named after Russian amateur astrophotographer Pavel Bahtinov, this specialized grid pattern produces three angled diffraction spikes when pointed at a bright star. Simply adjust your refractor or reflector focus knob until the central spike sits symmetrically between the outer two. Designed specifically for 105mm to 125mm class telescopes, it fits securely over dew shields with an outside diameter of 120mm to 152mm.
Optical SpecificationsKey fitment and compatibility details
Compatible Optics
105mm - 125mm Telescopes
Dew Shield Compatibility
120mm - 152mm Outside Diameter
Pattern Type
Pavel Bahtinov Diffraction Grid
Function
Precise Manual Astrophotography Focusing
Mounting Style
Friction Fit Pegs
Product Type
Optical Telescope Accessory
Performance FeaturesDesigned for rapid optical focusing
Diffraction Spike PatternEnables visual confirmation of exact focus
Optic CompatibilityTailored specifically for 105mm to 125mm telescopes
Versatile Mount FitmentAttaches to dew shields from 120mm to 152mm
Easy OperationSimplifies nighttime focus setup for astrophotography
Lightweight ConstructionKeeps setup balanced without adding excessive weight
Frequently Asked QuestionsEverything you need to know
How do I install the Bahtinov Mask for 120mm Optics on my telescope?
Simply fit or slide the mask over the front outer rim of your telescope's dew shield or optical tube assembly so it sits flush before acquiring your target star.
Which telescope sizes work best with the Bahtinov Mask for 120mm Optics?
The Bahtinov Mask for 120mm Optics is ideal for telescopes in the 105mm to 125mm aperture class and accommodates dew shields with an outer diameter between 120mm and 152mm.
How do I know when precise focus is reached using the Bahtinov Mask for 120mm Optics?
Point your telescope at a bright star and look at your camera display. Adjust focus until the center diffraction spike created by the Bahtinov Mask for 120mm Optics passes exactly through the intersection of the outer two spikes.