Agena AstroProducts Winter Sale

GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCTs

Our Price: $130.00

Sale Price: $115.00

Free shipping for this item in the US Click here for more info

Continental US Customers:
All items we sell ship for free within the Continental US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.

US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.

International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.

In stock (9 Available)
Ships by Next Business Day
Our Product ID: ODIA-GS-GS2QSCT
Manufacturer SKU: GS2QSCT
Item Can Ship: Worldwide
GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCTs

More Views

  • GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCTs
  • GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCTs
  • GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCTs

Quick Overview

  • Premium 2" diagonal with durable dielectric coatings for 99% reflectivity for bright images and long lifetime
  • 1/12-wave quartz mirror offers good thermal stability and minimal focus shift during long observing or imaging sessions
  • All-metal body with SCT barrel
  • Comes with 2"-1.25" eyepiece adapter for maximum flexibility
  • Includes foam-fitted storage box and end caps

Product Details

If you want a high-end mirror diagonal for your Schmidt-Cassegrain telescope, this GSO 2" Quartz Dielectric Diagonal Mirror is an excellent choice. GSO's 2" SCT diagonal features dielectric coatings with 99% reflectivity across the visible spectrum and a 1/12 wave quartz mirror. The all metal diagonal body is CNC machined. The combined result is a superb diagonal offering excellent mechanical and optical quality at a great price. Dielectric coatings are more durable than regular or enhanced aluminum coatings, so you will enjoy years of excellent performance from this product. Diagonals with comparable quality and specifications often sell for $200 or more in today's astronomy market.

High quality diagonal mirrors are usually made of BK7 glass. Quartz glass goes a notch higher - it offers greater thermal stability, resulting in minimal thermal expansion and contraction as compared to other glass types. The result is a minimal, if any, shift in focus due to temperature changes over long observation sessions, making this quartz diagonal ideal for photographic and imaging applications.

You can attach this diagonal directly to Schmidt-Cassegrain telescopes and many Maksutov-Cassegrain telescopes, as long as there is a SCT male thread on the telescope. The standard SCT thread is a 2"x24 tpi thread.

A 1.25"-2" adapter is included so you can use this diagonal with 1.25" or 2" eyepieces. The 1.25" and 2" holders both feature a brass compression ring, so your eyepiece barrels will not be scratched by the set screw. The 1.25"-2" adapter is also threaded to accept 2" filters. The clear aperture is 38.2mm. The diagonal comes in a very nice foam-fitted storage box and includes 2 end caps. Weight = 1lb-4oz. (with 1.25" adapter); 1lb-1oz. (without 1.25" adapter). Made in Taiwan.

Product Questions & Answers

No questions yet. Be the first to Ask a Question.

You May Also Be Interested In...

GSO Chrome Barrel from 2" GSO Refractor Diagonals (with Safety Groove)

GSO Chrome Barrel from 2" GSO Refractor Diagonals (with Safety Groove)

Our Price: $22.95
GSO 2" SuperView Eyepiece - 30mm

GSO 2" SuperView Eyepiece - 30mm

Our Price: $70.00

Sale Price: $63.00

GSO 2" 2x ED Barlow Lens # GS22B

GSO 2" 2x ED Barlow Lens # GS22B

Our Price: $75.00

Sale Price: $68.00