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This is a terrific 2" Stellarvue dielectric diagonal, in excellent condition, completely clean, with no marks on the body or optics.
This is an older model, the D1029EDU. Although the pamphlet specifically states that this is a dielectric diagonal, it does state that it is 99% reflective, and it also may not be made to the same 1/10th wave standards of newer Stellarvue diagonals. We have included a non-Stellarvue 2" to 1.25" adapter. Both the diagonal and the adapter have brass compression rings so as not to mar your eyepieces.
Description
This diagonal uses a thick, over-sized mirror with protective, dielectric coating. These diagonals are double tested at Stellarvue for perfect alignment and performance.
Star diagonals are a critical component of any telescope. The performance of an otherwise excellent telescope can be seriously compromised using a diagonal that is misaligned or pinched. Each diagonal and erecting prism we sell is tested for alignment and will preserve the exceptional quality of your telescope.
To clean, remove the loose dust from the surface with air from a bulb syringe or bulb blower such as a “Rocket Blower.” Using a soft camel hair brush about 1’ wide while blowing with the bulb blower will help remove particles.
Never blow on the surface as your breath, canned air or from an air compressor as moisture drops will spot the surface.
Once you have removed particles, apply reagent grade acetone to a lens cloth. Gently and very slowly draw the cloth across the mirror. Do not apply too much pressure when wiping the surface or you will scratch the mirror or coating. Follow precautions necessary when using acetone. Be advised that in cleaning the mirror, you will not end up with a pristine surface if you wipe too fast. With time you will learn how to avoid streaks. Some residual streaks may remain so only do this cleaning if necessary.
- Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings
- Provides a 90° viewing angle, perfect for more comfortable viewing through refractor and Cassegrain-type telescopes
- Multiple layers of dielectric coatings ensure the maximum amount of light collected by the telescope reaches the eyepiece
- Ensure maximum light transmission without loss of optical quality with the Stellarvue Dielectric Star Diagonal. Upgrade your existing star diagonal to this premium one and enjoy brighter, sharper images without replacing your telescope.
Standard Star Diagonals vs Dielectric Star Diagonal
The key specifications for a star diagonal are its reflectivity and its optical quality. This diagonal has diffraction-limited optical quality. This ensures that virtually all the light collected by the telescope will reach the eyepiece without the diagonal affecting optical performance. Using a lower quality star diagonal can both dim the view and degrade optical quality.