Sky Instruments
Antares 2" Diagonal, Mirror, Dielectric Ma... $149.95
  2" Mirror Diagonal with Twist-lock retainer and multilayer dielectric coating with 99% reflectivity in green (546nM) light. Reduces or eliminates vignetting, and allows for use of any 2" accessory.  Please note: does not include adapter for 1.25" / for use with 1.25" eyepieces, be sure to order Antares 1.25" Twist Lock Adapter
Celestron
Celestron Dielectric Star Diagonal 2" Twis... $337.95
Ensure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal, 2” with Twist-Lock. Upgrade your existing star diagonal to this premium one and enjoy brighter, sharper images without purchasing an entirely new telescope. Description This star diagonal reflects the telescope’s light path 90° to provide a more comfortable viewing angle. In addition, the glass has 58 layers of dielectric coatings, which provide an over 99% reflective surface, delivering the maximum amount of light to the eyepiece. This 2” star diagonal has the added benefit of allowing you to use larger 2” eyepieces with your telescope,...
Celestron
Celestron Dielectric Star Diagonal 1.25" W... $209.95
Ensure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal, 1.25” with Twist-Lock. Upgrade your existing star diagonal to this premium one and enjoy brighter, sharper images without replacing your telescope. Description This star diagonal reflects the telescope’s light path 90° to provide a more comfortable viewing angle. In addition, the glass has 58 layers of dielectric coatings, which provide an over 99% reflective surface, delivering the maximum amount of light to the eyepiece. The twist-lock eyepiece holder secures any 1.25” eyepieces while keeping them centered in the diagonal, thus providing best opto-mechanical alignment between...
Sky Instruments
Antares Verascope Finder (VS60F) $99.95
Description VS60F is a 1.25" right angle correct imaging package with EID90 prism and W25-X eyepiece for using VS60 as a finderscope. Magnification is 9X and true field is 6.5 degrees. It works with the Antares 60mm, VX60, finderscope.  With the cross-hair eyepiece and 90 degree diagonal, this unit will make the VX 60 finderscope and F50FB, six point finder bracket one of the most versatile finderscopes available.
Tele Vue Optics
Tele Vue 2" 90 Diagonal Everbrite Satin (D... $512.00
Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. This exotic, dielectric, nonmetallic coating is 99% reflective across the full visual spectrum, resulting in the "whitest," most natural image available. The coating is painstakingly applied to Pyrex with a surface accuracy of a 1/10 wave flatness. Description To ensure performance, every mirror is optically inspected under conditions far more critical than a diagonal mirror is ever used in typical telescopes. In this way, TeleVue can guaranty that the Everbrite will permit your telescope to operate at its fullest potential. The Everbrite is offered in both...
Celestron
Celestron 1.25" Star Diagonal (94115-A) $70.95
The Celestron 1.25” Star Diagonal slides into the focuser (1.25”) of your refractor or catadioptric telescope and accepts standard 1.25” eyepieces, allowing you to view objects more comfortably. A diagonal that is angled at 90º helps avoid neck strain when looking through through the eyepiece. Description Overview Fits telescopes with 1.25” focusers or visual backs, 90° viewing angle, best for observing objects overhead Accepts standard 1.25” eyepieces, Barlow lenses, and other accessories with a 1.25” insert barrel Please note that a 90º diagonal will display images that are right side up, but left to right orientation will be reversed.
Celestron
Celestron 45-Degree Erect Image Diagonal 1... $70.95
Did you know that most telescopes work well for daytime viewing as well as for astronomy? If you have a refractor or a catadioptric telescope (the Schmidt-Cassegrain is the most popular example), and you would like to use it for terrestrial observations, the most useful additional accessory you can buy is an erect-image diagonal. Description If you look through your telescope with the standard mirror or star diagonal installed, you will notice that objects may be either upside down, flipped so that you see a mirror image, or a combination of the two. This is fine for observations of celestial...
Sky Instruments
Antares 2" Diagonal, Mirror, Dielectric fo... $149.95
2" Dielectric mirror diagonal with twistlock, for SCT threads, 99% reflectivity at 546nM Description 2" Mirror Diagonal for Schmidt-Cassegrain thread-on with Twist-lock retainer and multilayer dielectric coating with 99% reflectivity in green (546nM) light. Reduces or eliminates vignetting, and allows for use of any 2" accessory.
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Tele Vue Optics
Tele Vue 1.25" 90 Diagonal Everbrite Satin... $512.00
Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. This exotic, dielectric, nonmetallic coating is 99% reflective across the full visual spectrum, resulting in the "whitest," most natural image available. The coating is painstakingly applied to Pyrex with a surface accuracy of a 1/10 wave flatness. Description To ensure performance, every mirror is optically inspected under conditions far more critical than a diagonal mirror is ever used in typical telescopes. In this way, TeleVue can guaranty that the Everbrite will permit your telescope to operate at its fullest potential. The Everbrite is offered in both...
Sky Instruments
Antares Dielectric 1.25" Diagonal (MSD-DTL) $119.95
Premium dielectric coatings in a carbon fibre body and twist lock adapter to prevent marring of eyepieces.  
Sky Instruments
Antares 45 Degree 2" Prism Diagonal (2EID45) $144.95
 A 45 degree 2" precision polished correct image amici prism that allows for terrestrial viewing with 2" eyepieces. MgF2 coated, It is also suitable for astronomy.

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