2Inch 90-deg Dielectric Mirror Diagonal for Astronomical Telescope High Quality

Product Description
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Click on the picture for details SV223 960x960_0000_0.jpg W9178A-960 (1).jpg
Model SV223 SV223 SV222 SV222 SV221 SV221 SV188/P SV188/P  
SKU W9180A
W9180B
 W9179A W9179B W9178A W9178B F9171A F9171B W2733A
Deflection Angle 90° 90° 45° 90° 90° 45° 90° 90° 90°
Diameter 1.25inch 2inch 1.25inch 1.25inch 1.25inch 1.25inch 1.25inch 1.25inch 2inch
Type Mirror Mirror Prism Prism Mirror Prism Mirror Mirror Mirror
left and right imaging reverse reverse forward forward reverse forward reverse reverse reverse
Up and down imaging forward forward forward forward forward forward forward forward forward
Equivalent optical path (mm) 85.5 109.1/118.6 93 65.6 73 86 78.5 78.5  
Effective aperture 25mm 43mm 16mm 19mm 29.5mm 19mm      
Advantage Coaxial locking, high-reflective dielectric coating, high surface accuracy Coaxial locking, high reflective dielectric coating, high surface accuracy, dozens of layers of coating, high surface accuracy Suitable for astronomical observations Suitable for astronomical observations Suitable for astronomical observations Suitable for astronomical observations   Highly reflective dielectric coating  
About this item

  • 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
Description:
 
      • 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
      • Color: Black
      • Net Weight: 529g/18.67oz
Package Includes
    • 1 x 2" 90-deg Dielectric Mirror Diagonal
    • 1 x 1.25" Dust Cover
    • 1 x 2" Dust Cover

about svbony

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