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Explore Scientific

Explore Scientific 2″ Rack & Pinion Focuser Extension Tube (ESRPEXT2)

Explore Scientific 2″ Rack & Pinion Focuser Extension Tube (ESRPEXT2)

$34.99
$34.99
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Shipping calculated at checkout.

The Explore Scientific 2″ Rack & Pinion Focuser Extension Tube (ESRPEXT2) is a simple yet powerful accessory that gives your telescope’s focuser extra draw‑tube travel. By adding roughly 1.5″ (≈ 38 mm) of extension, this tube helps you achieve focus when using thick eyepieces, cameras, imaging trains, diagonals, or other accessories that require extra back‑focus. It’s a lightweight, compact solution to extend the focal plane range of compatible rack‑and‑pinion focusers — ideal for astrophotography, heavy eyepiece use, or custom optical configurations.

Features

  • Provides approximately +1.5″ (≈ 38 mm) extra draw‑tube travel — beneficial when using bulky eyepieces, cameras, filter wheels, or imaging gear.

  • Designed for use with compatible 2″ rack‑and‑pinion focusers — integrates seamlessly without major modification.

  • Helps reach focus when standard draw‑tube travel is insufficient — especially useful for astrophotography or deep‑sky setups.

  • Lightweight, machined metal construction — durable and easy to handle without significantly increasing the weight of your focuser.

Specifications

Specification Detail
Model Number ESRPEXT2
Extension Length Approx. 1.5″ (≈ 38 mm)
Compatible With 2″ Rack & Pinion focusers compatible with Explore Scientific optical tubes
Purpose Additional back‑focus / draw‑tube travel for eyepiece, camera, or accessory clearance
Material Machined metal / anodized finish
Typical Use Cases Thick 2″ eyepieces, cameras & imaging rigs, filter wheels, diagonals, custom optical setups

What’s Included

  • 1 × Extension tube (ESRPEXT2), ready to install onto a compatible 2″ rack & 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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