Cloud Break Optics

3.5" Adapter for 4" Focuser (ADA435)

3.5" Adapter for 4" Focuser (ADA435) - Main image
$103.09 $169 In stock

Category: Astrophotography Accessories

Description


Use the 0.72x QuadTCC with the 4” Focuser!

This adapter will allow owners of Astro-Physics refractors with 4” focusers to use the QuadTCC Telecompressor Corrector! The adapter fits into the 4” focuser’s drawtube and is secured with the focuser thumbscrews.

The QuadTCC will then insert and be held securely via the three ADA435 thumbscrews. Fully corrected images with 0.72x compression will be possible using full frame cameras.

This extension has a net spacing distance of 0.90" (22.9 mm).

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    Customer Reviews (4.6 / 5 · 5 reviews)

    Isabella O. ★★★★★

    The machining is spot-on, threads engaged smoothly without any binding. Finally got my QuadTCC mounted securely on the 4" focuser—no wobble at all.

    Emma C. ★★★★★

    My old setup had a gap between the focuser and the QuadTCC, but this adapter bridges it perfectly with a snug, precise fit. The threading is smooth and there's zero play once tightened, which is exactly what I needed for sharp imaging.

    John ★★★★★

    Finally got the QuadTCC working on my 4” focuser with this little ring, and the spacing is spot-on for the 0.72x reducer. Threads are clean and the fit is rock solid—no wobble or tilt when I rack the focuser in and out. Took maybe two minutes to swap over, and my stars look round edge to edge now.

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