Astrozap Focusing Cap for 6" SCT

AstroZap Bahtinov Focusing Cap – For 6" Schmidt-Cassegrain Telescopes

Snap-On Precision Focusing for Your 6" SCT

The AstroZap focusing cap combines dust protection with a precision focusing tool, giving your 6" Schmidt-Cassegrain telescope a smart two-in-one upgrade. The built-in Bahtinov mask helps you achieve razor-sharp focus on stars in seconds—whether you’re imaging or dialing in critical visual sharpness.

Unlike loose or delicate clip-in masks, this model is built directly into a durable, hinged plastic cap that fits securely over the front of your OTA like a standard dust cover. When not in use, a rotating inner disk with the Bahtinov cutout can be closed to protect the mask—and your optics—from dust and scratches.

How It Works:

The AZ-423 works by producing a distinctive diffraction spike pattern when aimed at a bright star. As you adjust focus, the central spike moves between two angled spikes. When the central spike is perfectly centered between the two, you're in perfect focus. It’s faster, more accurate, and more repeatable than focusing by eye—especially with the unforgiving precision required for high-resolution imaging or planetary detail.

• Key Features:

  • Integrated Bahtinov Mask: Built-in mask makes achieving pinpoint focus fast and foolproof

  • Protective Cover Design: Functions as a dust cap when not in focusing mode

  • Rotating Disk Mechanism: Expose or close off the mask cutout with a simple twist

  • Custom Fit for 6" SCTs: Designed to fit standard Meade and Celestron 6" Schmidt-Cassegrains

  • Field-Ready Design: No fumbling with separate masks in the dark

  • Ideal for Imaging or Critical Visual Work

  • Made in the USA: Precision-built by AstroZap

  ---

  Compatibility:

  Fits standard 6" Schmidt-Cassegrain telescopes from Celestron and Meade. Designed for optical tubes that accept standard slip-on caps. May not fit securely on OTAs with oversized dew shields.

  ---

  Observing Tip:

  Use the Bahtinov mask on a bright star near your target, focus until the diffraction spikes align, then remove the cap and begin observing or imaging. It's that easy—and that accurate.