Astrozap Focusing Cap with Built-In Bahtinov Focusing Mask for Meade ETX-90 and Similar Scopes

AstroZap Focusing Cap with Built-In Bahtinov Mask – For Meade ETX-90 and Similar Scopes

The Meade ETX-90 and other compact Maksutov-Cassegrain telescopes deliver impressive optical performance in a portable package—but nailing perfect focus at high powers or with a camera can be a challenge. Enter the AstroZap Focusing Cap with Built-In Bahtinov Mask, the ideal accessory for fine-tuning focus with ease, accuracy, and zero guesswork.

Custom-fit for Meade ETX-90 and similar small-aperture scopes, this clever cap combines a protective dust cover with a built-in Bahtinov focusing mask, accessed via a smooth sliding shutter. When opened, the mask reveals a diffraction pattern around a bright star. Simply adjust focus until the central spike is centered between the other two, and you’re in sharp, pinpoint focus. Close the shutter when you're done, and the cap resumes its role as a full-time dust shield.

Whether you're a planetary imager, a lunar observer, or a casual stargazer who wants to get the most out of your optics, this compact upgrade makes your ETX more powerful—and more precise.

Features:

• Designed for Meade ETX-90 and similar ~90mm Maksutov-Cassegrain scopes

• Combines a dust cap with a built-in Bahtinov focusing mask

• Sliding shutter design reveals the mask when needed, hides it when not

• Enables fast, precise focusing using diffraction spike alignment

• Lightweight and compact—perfect for travel and grab-and-go setups

• Durable construction for repeated field use

Compatibility Note:

Sized specifically for front cell diameters found on the Meade ETX-90 and other small Maks. If you’re unsure whether this will fit your scope, reach out and we’ll help confirm compatibility.

Observing Tip:

The ETX-90’s long focal length and narrow focus range make accurate focusing especially important—especially for planetary and lunar detail. This focusing cap helps you lock in ideal focus in seconds, and you’ll never misplace it because it’s always on your telescope.