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Explore Scientific

Explore Scientific 2.5″ Hex Rack & Pinion Focuser Extension Tube — 2″ Extension (ESHEXEXT2)

Explore Scientific 2.5″ Hex Rack & Pinion Focuser Extension Tube — 2″ Extension (ESHEXEXT2)

$39.99
$39.99
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Shipping calculated at checkout.

The Explore Scientific ESHEXEXT2 extension tube adds vital extra draw‑tube travel to 2.5″ hexagonal rack‑and‑pinion focusers. If you’re using thick eyepieces, cameras, filter wheels, or heavy imaging trains that demand more back‑focus than stock focusers allow, this 2″ (≈ 38 mm) extension solves that — enabling you to reach focus without compromising stability. It’s a lightweight, machined‑metal accessory that integrates seamlessly with compatible focusers, giving you the flexibility to use a wider range of accessories and making your telescope setup more versatile for both visual observing and astrophotography.

Features

  • Adds approximately 2″ (≈ 38 mm) of extra draw‑tube travel — ideal for heavy eyepieces, cameras, diagonals, or imaging rigs.

  • Compatible with 2.5″ Hexagon rack‑and‑pinion focusers — ensures a secure, flush fit with no modification required.

  • Machined metal construction with a durable finish — lightweight yet rugged for frequent use under field or observatory conditions.

  • Extends the usable focal plane — helpful for astrophotography, filter‑wheel setups, or thick eyepieces where extra back‑focus is needed.

Specifications

Specification Detail
Model Number ESHEXEXT2
Extension Length Approx. 2″ (≈ 38 mm)
Compatible With 2.5″ Hexagon Rack & Pinion Focusers from Explore Scientific
Purpose Adds drawtube travel / back‑focus for eyepieces, cameras, diagonals, imaging rigs
Material Machined metal (anodized finish)
Use Cases Visual astronomy with large eyepieces, astrophotography, heavy accessory setups

What’s Included

  • 1 × 2″ Extension Tube (ESHEXEXT2) for 2.5″ hex rack‑and‑pinion focuser

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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