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This is a terrific 1.25" Stellarvue 99% dielectric diagonal, with 1/10th wave accuracy. It is in excellent condition, completely clean, with no marks on the body or optics. Of course, it uses a compression ring to hold your eyepiece in place without marring the body, as you would expect.
It comes in its original foam-lined box with both dust caps.
Description
- The D1030 adds 3.7" (94mm) to the optical path.
- The D1030 adds 7.15oz to the overall weight of the system
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.
Comes with a thick, precision, optical flat mirror with an enhanced 99% reflective dielectric coating. Compression ring holds eyepieces firmly and the insert tube has the safety groove and filter thread. All aluminum construction. Individually double tested at Stellarvue for perfect alignment and freedom from astigmatism.
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.