• Explore Scientific 3-Inch Self-Centering Focuser for 152mm and 165mm Refractors — Precision Focuser for ES Large Achromat OTAs
  • Explore Scientific 3-Inch Self-Centering Focuser for 152mm and 165mm Refractors — view 2
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  • Explore Scientific 3-Inch Self-Centering Focuser for 152mm and 165mm Refractors — view 9
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Explore Scientific

Explore Scientific 3-Inch Self-Centering Focuser for 152mm and 165mm Refractors — Precision Focuser for ES Large Achromat OTAs

Explore Scientific 3-Inch Self-Centering Focuser for 152mm and 165mm Refractors — Precision Focuser for ES Large Achromat OTAs

$849.99
$849.99
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The Explore Scientific 3-inch self-centering telescope focuser is a precision upgrade for 152mm and 165mm large achromatic refractors. A focuser is the mechanism that moves your eyepiece or camera in and out to reach a sharp image, and this heavy-duty 3-inch unit provides the smooth, load-bearing travel that big refractors and imaging gear demand.

Its self-centering design keeps eyepieces and cameras precisely aligned on the optical axis, while the large 3-inch drawtube supports heavy accessories without slop — ideal for demanding visual and astrophotography use on ES large-aperture OTAs.

Who it's for

For owners of Explore Scientific 152mm/165mm large achromat refractors who want a precise, high-capacity focuser upgrade or replacement. New to gear? See our astronomy 101 stargazing basics guide.

Key features

  • 3-inch large-format focuser for big refractors and heavy accessories.
  • Self-centering mechanism that keeps optics aligned on-axis.
  • Smooth, load-bearing travel for confident visual and imaging focus.
  • Designed for ES 152mm/165mm achromat OTAs.
  • Precision build to eliminate slop and flexure.
Specifications
Brand Explore Scientific
Model ES-FOC3
Type 3-inch self-centering focuser
Designed for ES 152mm & 165mm achromatic refractors

Frequently asked questions

What does self-centering mean?
The focuser holds eyepieces and cameras precisely on the optical axis, keeping your view or image aligned as you swap accessories.

Why a 3-inch focuser?
Large refractors and heavy imaging trains need a big, rigid focuser to support the weight and pass the full light cone without flexure.

Will it fit my telescope?
It's designed for Explore Scientific 152mm and 165mm large achromat OTAs. Confirm your tube and focuser mounting before ordering.

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Frequently Asked Questions

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