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Explore Scientific

Explore Scientific 2.5-Inch Hex Rack & Pinion Focuser Extension Tube — Add 2 Inches of Back-Focus Reach to Your Telescope

Explore Scientific 2.5-Inch Hex Rack & Pinion Focuser Extension Tube — Add 2 Inches of Back-Focus Reach to Your Telescope

Regular price $44.99
Regular price Sale price $44.99
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The Explore Scientific 2.5-Inch Hex Rack & Pinion Focuser Extension Tube adds two inches of back-focus reach to Explore Scientific 2.5-inch hexagonal (HEX) rack-and-pinion focusers. It provides the extra spacing heavier imaging trains or diagonals sometimes need to reach focus, with the rigidity the larger HEX focuser demands.

Building out your setup? See our guide to the telescope accessories every beginner needs.

Key features

  • Adds 2 inches of back-focus to a 2.5" HEX focuser
  • Matched to Explore Scientific 2.5" HEX rack-and-pinion focusers
  • Rigid metal construction for heavy imaging trains

Specifications

Type HEX focuser extension tube
Length 2 inches
Fits Explore Scientific 2.5" HEX rack-and-pinion focusers
SKU ESHEXEXT2

Frequently asked questions

Will it fit my focuser?
It's made specifically for Explore Scientific 2.5-inch HEX rack-and-pinion focusers (found on many ED and FCD100 refractors).

When do I need it?
When a diagonal, binoviewer, or camera train needs extra spacing to reach focus on a scope with the 2.5" HEX 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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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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