• Explore Scientific 3-Inch Self-Centering Focuser for ED127 and FCD100 Refractors — Precision Focuser for High-End Apochromats
  • Explore Scientific 3-Inch Self-Centering Focuser for ED127 and FCD100 Refractors — view 2
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Explore Scientific

Explore Scientific 3-Inch Self-Centering Focuser for ED127 and FCD100 Refractors — Precision Focuser for High-End Apochromats

Explore Scientific 3-Inch Self-Centering Focuser for ED127 and FCD100 Refractors — Precision Focuser for High-End Apochromats

$999.99
$999.99
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This Explore Scientific 3-inch self-centering focuser is configured specifically for Explore Scientific ED127 and FCD100 apochromatic refractors, with the matching back-cell adapter to bolt straight on. Its large 3-inch drawtube and self-centering compression rings hold heavy 2-inch eyepieces, diagonals, and camera trains perfectly square to the optical axis — giving high-end apochromats the rigid, sag-free focusing they deserve.

Who it's for
Owners of Explore Scientific ED127 or FCD100 refractors who want a rock-solid, high-load focuser for critical imaging or high-power visual use. Building out your setup? See our guide to beginner telescope accessories.

  • Made for ED127 / FCD100: ships with the correct back-cell adapter for these apochromats.
  • 3-inch drawtube: large, rigid focuser for heavy eyepieces and imaging trains.
  • Self-centering grip: holds accessories square to the optical axis, reducing tilt.
  • High load capacity: built for the weight of big diagonals, binoviewers, and cameras.
  • Critical focus: smooth, precise movement for demanding astrophotography.
Specifications
Type 3-inch self-centering focuser
Drawtube 3" (accepts 2" accessories via reducer)
Fitment Back-cell adapter for ED127 and FCD100 refractors
Best For High-end apochromat imaging and visual use
Model / SKU ES-FOC3-BC100127T

How is this different from the standard 3-inch focuser?
It comes with the back-cell adapter matched to the ED127 and FCD100 refractors, so it bolts directly to those tubes.

Will it fit other telescopes?
This configuration is intended for the ED127 / FCD100. For other refractors, choose the version with the appropriate back-cell adapter.

Why upgrade to a 3-inch focuser?
Heavy imaging trains and binoviewers can flex a smaller focuser; a 3-inch self-centering unit holds them square for sharper, more repeatable focus.

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