Dielectric Mirror Diagonal for Astronomical Telescope with 1.25 inches Adapter
- Excellent Quality Dielectric Diagonal; Mirror Star Diagonal - 99% Reflectivity?Provides a Comfortable 90 Degree View from your Refractor; Fits Standard 2" (50.8 mm) Diameter Focus Tubes; Use Both 2" (50.8 mm) and 1.25" (31.75 mm) Eyepieces
- New 2" 90 deg 99% Dielectric Mirror Diagonal for Telescope With 1.25" adapter; full metal;has a 1/10th wave flat optical glass surface;solid aluminum housing;threaded to accept standard 2" filters;The 2" eyepiece holder uses a non-marring brass compression ring to secure your valuable eyepieces. The 1.25" adapter also has a non-marring brass compression ring
- Both sizes of eyepieces may be used and are protected from dings and scratches that would result from a standard set-screw. This 2" diagonal works with any Refractor that accepts a 2" star diagonals. It can also be used with Schmidt-Cassegrain or Maksutov-Cassegrain with an optional 2 inch visual back (See below)
- Dielectric diagonal is especially important;A standard aluminized diagonal has about 92% reflectance;And this decreases with time as the aluminum mirror surface ages
- For the vast majority of the visible spectrum;the reflectance does not vary more than about 0.1% below 100%;And the dielectric surface does not age like aluminum;This combination leads to the equivalent of a little more light grasp compared to standard diagonals
If you paid for high performance coatings for your telescope, why lose 8% of your light using a standard diagonal
We list our dielectric coated diagonals at 99% reflectance, but this does not tell the complete story.
While the reflectance is at a little more than 99% for the deep violet and reds, the reflectance for a the rest of the spectrum is essentially 100%
100% Brand New and Never Used
High glossy finish appearance
Threads fit standard 1.25'' and 2'' filters
Excellent Quality Dielectric Diagonal
Provides a Comfortable 90 Degree View from your Refractor
Fits Standard 2" (50.8 mm) Diameter Focus Tubes
Can Use Both 50.8 mm and 31.75 mm Eyepieces
Has a non-marring brass compression ring to secure your valuable eyepieces
Net Weight: 529g/18.67oz
1 x 2" 90-deg Dielectric Mirror Diagonal
1 x 1.25" Dust Cover
1 x 2" Dust Cover
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Filed under: Eyepieces & Accessories