Astrozap Focusing Cap - Bahtinov Focusing Mask - Celestron 5" SCT or Astro-Tech AT115EDT
Manufacturer Part # AZ-405
AstroZap Focusing Cap with Built-In Bahtinov Mask – For Celestron 5" SCT & Astro-Tech AT115EDT
Perfect focus doesn’t have to be a guessing game. Whether you're using the compact Celestron 5" SCT or the critically acclaimed Astro-Tech AT115EDT triplet refractor, the AstroZap Focusing Cap with Built-In Bahtinov Mask gives you the accuracy of a dedicated focusing tool with the convenience of a dust cap—no extra accessories to juggle, no fumbling in the dark.
This dual-purpose cap features a precision Bahtinov mask built into the front cover, hidden behind a sliding shutter. When you’re ready to focus, simply slide open the cover and point your scope at a bright star. The resulting three-spike diffraction pattern lets you adjust focus with laser-like precision. As the center spike moves between the outer two, you can see exactly when you’ve reached optimal focus.
When you're done, just close the shutter and your scope’s optics are protected from dust, moisture, and stray fingers. It’s an elegant, efficient upgrade—especially for imaging with compact SCTs or mid-size refractors like the AT115EDT, where critical focus is absolutely essential.
Features:
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Made to fit the Celestron 5" SCT and Astro-Tech AT115EDT refractor
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Combines a dust cap with a built-in Bahtinov focusing mask
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Sliding shutter reveals or hides the mask—no need to remove the cap
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Achieve precise, repeatable focus in seconds using diffraction spikes
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Lightweight and durable design perfect for field or backyard use
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Works equally well for astrophotography and critical visual focusing
Compatibility Note:
This model is precision-fit for the Celestron 5" SCT front cell and refractors with similar front diameters, such as the Astro-Tech AT115EDT. If you're unsure about fitment, feel free to reach out and we’ll help you confirm sizing.
Observing Tip:
Refractors like the AT115EDT and SCTs like the 5" Celestron have tight focus tolerances—especially with modern CMOS cameras. The built-in Bahtinov mask saves time, increases accuracy, and eliminates the need to carry a separate focus aid. One accessory, two functions, no compromises.