• Explore Scientific Two-Speed 10:1 Focus Knob for 2.5-inch HEX Focusers
  • Explore Scientific Two-Speed 10:1 Focus Knob for 2.5-inch HEX Focusers
  • Explore Scientific Two-Speed 10:1 Focus Knob for 2.5-inch HEX Focusers
1 3

Explore Scientific

Explore Scientific Two-Speed 10:1 Focus Knob for 2.5" Hex Focusers — Precise Micro-Focus Upgrade | Telescope Wolves

Explore Scientific Two-Speed 10:1 Focus Knob for 2.5" Hex Focusers — Precise Micro-Focus Upgrade | Telescope Wolves

$99.99
$99.99
Sale Sold out
Shipping calculated at checkout.

This Explore Scientific two-speed focus knob is a precise micro-focus upgrade for the 2.5" HEX focuser found on Explore FirstLight and select Bresser Messier telescopes. A telescope focuser is what moves the eyepiece in and out to sharpen the view, and a dual-speed knob adds a second, much slower gear so you can nail perfect focus at high magnification.

With a 10:1 reduction ratio, one knob gives you a fast coarse focus and an ultra-fine focus in the same smooth motion — a small change that makes a big difference on planets, the Moon and for astrophotography.

Who it's for: Owners of Explore Scientific FirstLight or Bresser Messier telescopes with a 2.5" HEX focuser who want sharper, more repeatable focus. New to telescopes? Start with our guide on how to pick your first telescope.

  • 10:1 dual-speed focusing: coarse knob for fast travel, fine knob for ultra-precise focus.
  • All-metal construction: durable build with a stainless-steel ball bearing for buttery-smooth action.
  • Direct HEX focuser fit: designed for Explore Scientific and Bresser 2.5" HEX focusers.
  • Lightweight: adds just 5.6 oz (159 g), so it won't upset your balance.
  • Sharper high-power views: makes fine focus effortless on planets, the Moon and deep-sky imaging.
Specifications
Type Two-speed focus knob mechanism
Reduction ratio 10:1
Construction All-metal, stainless-steel ball bearing
Weight 5.6 oz (159 g)
Compatibility Explore Scientific & Bresser 2.5" HEX focusers (FirstLight / Messier series)

Will this fit my telescope?
It's made for the 2.5" HEX focuser used on Explore Scientific FirstLight and select Bresser Messier telescopes. Check that your telescope uses that HEX focuser before ordering.

What does a two-speed knob actually do?
It adds a slower 10:1 fine-focus gear alongside the standard coarse focus, so you can make tiny, precise adjustments to sharpen the image.

Do I need this for astrophotography?
It's highly recommended. Fine focus is critical when imaging, and the 10:1 mechanism makes it much easier to hit a sharp point of focus.

Is it hard to install?
No. It replaces the existing focus knob on a compatible HEX focuser and requires only basic hand tools.

View full details

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.
Most orders ship within 5 business days. You'll receive tracking information within 24 hours of your order leaving the warehouse. For full details, visit our Shipping Policy.
Orders cancelled after 48 hours are subject to a $20 administration fee. If your order has shipped, you are responsible for return shipping costs. Refunds are issued to the original payment method. See our full Refund Policy for details.
Yes! If you find a lower price at another authorized online retailer within 6 months of your purchase, we'll refund the difference. Learn more on our Price Match Guarantee page.
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.
Please inspect your package on arrival and note any damage when signing for delivery. Send photos to info@telescopewolves.com and we'll process a claim on your behalf.
Absolutely. Our team is available Monday to Friday, 9am–5pm EST. The best way to reach us is by live chat (in the bottom right hand corner) or by email at info@telescopewolves.com. You can also visit our Contact Us Page.