GSO 1.25" 90-deg Mirror Star Diagonal for Refractors # GSST

Our Price: $30.00
Free shipping for this item in the US Click here for more info

Contiguous US Customers:
All items we sell ship for free within the Contiguous 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 (10+ Available)
Ships by Next Business Day
Our Product ID: ODIA-GS-GSST
Manufacturer SKU: GSST
Item Can Ship: Worldwide
GSO 1.25" 90-deg Mirror Star Diagonal for Refractors # GSST

More Views

  • GSO 1.25" 90-deg Mirror Star Diagonal for Refractors # GSST

Quick Overview

  • Economical 1.25” 90-deg star diagonal for refractor or catadioptric scopes
  • Aluminized 1/10-wave mirror with SiO2 coating at 92% reflectivity
  • Threaded for standard 1.25” filters

Product Details

New version: Now with brass compression ring!

GSO's 90-deg mirror diagonal is a very good, economical replacement for the generic diagonal that probably came with your otherwise fine scope. Features Al+SiO2 coatings with 92% reflectivity across the visible spectrum and a 1/10 wave mirror.

The clear aperture is 27.9mm. The main mirror housing is made of precision molded ABS plastic and the two end barrels are precision machined from aluminum. The 1.25" nosepiece is threaded to accept standard 1.25" astronomy filters. Weight: 4.4oz; 2 end caps included. Made in Taiwan.

Please Note: This diagonal can only be used with refractor telescopes and some catadioptric telescopes like Schmidt-Cassegrain, Maksutov-Cassegrain, etc. It not meant for use with Newtonian / Dobsonian reflector telescopes or other variants of Newtonian telescopes.