Enjoy A Discount, On Us!

Save 5% off your order using code 5OFF

Explore Scientific 3-inch Self-Centering Focuser - ES-FOC3

Explore Scientific 3-inch Self-Centering Focuser - ES-FOC3

Style
Regular price $849.99
/
  • Free Shipping
  • Free 30-Day Returns
  • Ships In 2-5 Business Days Directly From Manufacturer
  • No Sales Tax Outside Washington State
  • Price Match Guarantee
  • Secure Payments
  • In stock, ready to ship
  • Inventory on the way
Shipping calculated at checkout.

We understand that you have plenty of online retailers to choose from, and we're just one of many. However, here are the things that set us apart from the rest -

  • Free shipping in the contiguous United States. No surprise fees. The price you see is the price you pay.
  • Unbeatable 30-Day return policy. WE pay for the return shipping AND any restocking fee enforced by the supplier so you can shop worry free.
  • Price Match Guarantee. We strive to have the best online prices. If you find a better one, let us know and we'll match it.
  • Product Passion. To us, you are not simply a customer. You are a colleague who has a similar fascination for the stars and wants the best tools available to admire them. That's why we only stock products that will exceed your expectations.
  • Visit our About Page to learn more

Description

With its ability to support heavy imaging trains without sacrificing stability, precision or smooth rotation, the robust Explore Scientific 3-inch Self-Centering Focuser is designed to meet the demanding requirements of astrophotography.

This heavy-duty focuser has a self-centering compression system that applies pressure equally to the draw tube, guaranteeing a tight, secure fit. This uniform pressure creates a stable base for an imaging setup and prevents flex, tilt and image shift. The draw tube, which is long enough to eliminate the need for extension tubes, is moved by a helical rack-and-pinion system lubricated with marine-grade PTFE silicone for an easy glide with maximum precision and minimal backlash. The interior of the draw tube has a diameter of 3 inches that is lined with multiple baffles to reduce reflection.

The draw tube, which has a travel of 84.5mm, is supported by a locking clutch system. The focusing system has a lifting capacity of 17 pounds. Moderate tightening offers an infinite range of tension to best suit the application.

Weighing in at 5.7 pounds, the focuser is made of black anodized aluminum. It has a 9:1 focus system with stainless-steel ball bearings and stainless-steel focus shaft. This system works as a clutch to prevent damage to the focusing mechanism. The focusing system is compatible with popular after-market electric focuser devices.

A back cell adapter with no-tool knobs attaches the focuser at four contact points to select Explore Scientific refractors with apertures ranging from 120mm to 140mm. The knobs on the adapter can be hand turned, eliminating the need for a hex key. This makes it easy to adjust the rotation of the focuser with minimal observing or imaging interruption. A Teflon ring on the focuser adds to the smooth rotation. NOTE: The Explore Scientific 152mm and 165mm models do not require this back cell adapter.

For versatility, the focuser can hold 2-inch or 3-inch visual or camera accessories and comes standard with twist-lock. In addition to allowing accessories to be secured with a compression fitting, this draw tube’s M82 x 1.25 pitch thread accepts adapters with a variety of uses.

Video

Specs

Item Number ES-FOC3
Lifting Capacity 17 lbs/37.4 kg
Draw Tube Thread M82 x 1.25
Draw Tube Travel 84.5 mm/3.32 inches
Draw Tube Clear Interior Diameter 76.2 mm/3 inches
Draw Tube Baffles 14
Focus System Helical rack & pinion
Reduction Ratio 9:1 with stainless steel ball bearings and shaft
Attachment mechanisms Self-centering compression
Weight of focuser 5.7 pounds including the 3-inch to 2-inch twist-lock adapter
Compatible with electric focusers Yes
Telescope compatibility Explore Scientific refractor telescopes 120 mm and larger; custom back cells available on request for other brands of refractor telescopes 120 mm and larger

Warranty

Limited USA One Year Warranty when product is registered within 60 days of purchase. Click Here to register.

CA Residents: Prop 65 WARNING(S)

    • We are happy to offer free shipping to all bordering states in the United States
    • Shipping typically takes 2-5 business days and is sent directly from the manufacturer
    • A tracking number will be provided when the manufacturer ships out the items. Please allow up to 5 business days to be provided with a tracking number

      30-Day Return Policy: no postage, no restocking fee, no worries!

      Astraeus Optics will cover shipping fees as well as any restocking fee that the manufacturer enforces.


      To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Custom made items are not eligible for returns or refunds.

      There are certain situations where only partial refunds are granted: (if applicable)

      • Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
      • Any item that is returned more than 30 days after delivery


      You can request a refund by Contacting Us.
      We will credit you for the total purchase price upon the receipt of your return. Products returned under this policy are eligible for a refund to the original method of payment.


      Defective Product Returns

      We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at support@astraeusoptics.com


      Refunds

      We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
      If more than 15 business days have passed since we’ve approved your return, please contact us at support@astraeusoptics.com

      This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

      Recently viewed