William Optics 75mm -110mm Bahtinov Focusing Mask

The William Optics 75mm -110mm Bahtinov Focusing Mask is a versatile and precise focusing tool designed for telescopes with apertures ranging from 75mm to 110mm. This adjustable mask helps astronomers achieve pinpoint focus for astrophotography and visual observations by creating a distinctive diffraction pattern around bright stars.

Ensure your telescope's aperture falls within the 75mm to 110mm range for proper fit and functionality.

Adjustable Design

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Features an innovative adjustable design that allows the mask to fit a range of telescope apertures from 75mm to 110mm. This versatility makes it compatible with various refractors, reflectors, and catadioptric telescopes within the specified size range.

Focusing Mechanism

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The Bahtinov mask creates a specific diffraction pattern when pointed at a bright star. This pattern allows for extremely accurate focusing by aligning the central spike with the intersection of the outer spikes, ensuring pinpoint stars in your images or visual observations.

Construction:

Made from durable, lightweight material that's resistant to warping and flexing, ensuring consistent performance over time. The mask is designed to be easily attached and removed from the telescope, with a smooth, non-marring surface to protect your telescope's finish.

Ease of Use

Simple to use, even for beginners. Place the mask over the telescope's aperture, adjust to fit, point at a bright star, and adjust focus until the diffraction pattern is symmetrical and properly aligned. The clear and intuitive pattern makes achieving perfect focus straightforward.

Benefits for Astrophotography

Achieving precise focus is crucial for astrophotography. This Bahtinov mask allows for consistently sharp, well-focused images of celestial objects, enhancing the overall quality of astrophotos taken with telescopes in the 75mm to 110mm aperture range.

Visual Observation Enhancement

While primarily used for astrophotography, the mask can also help achieve optimal focus for visual observations, providing sharper views of planets, stars, and deep-sky objects. This can significantly improve the detail and clarity of visual astronomical observations.

Versatility

The adjustable design allows this single mask to be used with multiple telescopes within the specified aperture range. This versatility makes it an excellent accessory for astronomers with multiple instruments or those considering future telescope upgrades within the size range.

Portability

Lightweight and compact, this Bahtinov mask is easy to transport along with your telescope to dark sky sites or star parties. Its durable construction ensures it can withstand the rigors of frequent use and transportation.