140mm Bahtinov Mask
$40.00
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140mm Bahtinov Mask
$40.00
Precise Focus
Perfect diffraction spike patterns
Optical Compatibility
Fits 125mm to 130mm telescopes
Adjustable Mounting
Fits dew shields 153 to 192mm
Focusing Made SimpleAchieve crisp astrophotography imagery easily
The Bahtinov Mask for 140mm Optics is an essential astrophotography focusing tool designed to achieve pinpoint focus with your telescope. Simply attach the mask to your telescope's front optic, observe the distinct diffraction spike pattern on your display, and make quick focus adjustments until perfect center alignment is achieved.
Precision Optical AidThe ultimate tool for razor-sharp astrophotography focus
Named after Russian amateur astrophotographer Pavel Bahtinov, the Bahtinov Mask for 140mm Optics takes the guesswork out of night sky focusing. By generating angled diffraction spikes when pointed at a bright target star, this lightweight focusing mask allows observers and astro-imagers to visually verify accurate focus in seconds. Ideal for 125mm to 130mm class refractors and reflectors, it easily mounts to outer dew shield diameters ranging from 153mm to 192mm, guaranteeing sharper astrophotography results every night.
Technical SpecificationsSizing and compatibility details
Mask Size
140mm
Compatible Telescope Class
125mm - 130mm optics
Dew Shield Outside Diameter Fit
153mm - 192mm
Primary Application
Astrophotography Focus Tool
Pattern Design
Pavel Bahtinov Pattern
Key CapabilitiesDesigned for seamless night sky focusing
Diffraction PatternGenerates distinct optical spikes for precise focus verification
Target CompatibilityIdeal for 125mm to 130mm class refractors and reflectors
Flexible FitmentAdjustable attachment fits dew shields from 153mm to 192mm OD
User FriendlySimple operation by placing over the main objective lens or tube
Night Sky ReadyDurable construction designed for routine field astrophotography
Frequently Asked QuestionsEverything you need to know
How do I use the Bahtinov Mask for 140mm Optics?
Place the Bahtinov Mask for 140mm Optics over the front dew shield of your telescope, point toward a bright star, and take a short test exposure. Adjust your telescope focuser until the central diffraction spike sits directly in the middle of the X pattern.
What telescope sizes are compatible with the Bahtinov Mask for 140mm Optics?
The Bahtinov Mask for 140mm Optics is designed primarily for 125mm to 130mm class telescopes and fits dew shields with an outside diameter between 153mm and 192mm.
Can I use the Bahtinov Mask for 140mm Optics for visual observing?
Yes, while primarily designed for astrophotography cameras, you can also use the Bahtinov Mask for 140mm Optics visually through an eyepiece when pointing at a bright star to verify sharp focal point.