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Precision Astronomical Mirrors by GSO - Made in Taiwan    
Parabolic Astronomical Telescope Mirrors 1/12 Wave are polished and figured to yield high level performance. Each mirror is aluminized and hard over coated with protective over coat, ready for placement in the telescope tube. All mirror surfaces are free of any defects which affects performances. Special equipments and techniques makes system mirror the least expensive to any other comparable coated mirror. Resolving power and reflective ability are the specialty of the GSO ASTRONOMICAL TELESCPE MIRROR QUALITY.

GSO offers very HIGH quality parabolic telescope mirrors for the people who want to build their own telescopes or DIY project. 

Our parabolic telescope mirror size ranges from 6" to 16", all of these mirrors are made from BK7 quality optical glass and all the mirror surface quality over 1/16 wave RMS at the least, typically better.

All telescope mirrors have an aluminum reflective coating, reflectivity is approximately 93%. The aluminum coating is protected by a properly applied protective coating (SiO2).
 
GSO makes the World's Finiest Astronomical Mirrors with unmatched manufacturing optical precision.
100% MADE IN TAIWAN -
Astronomical Primary & Secondary Mirrors
 
STANDARD SPECIFICATION for Telescope Mirrors   Add 18% GST
6" F/8 D = 153mm / F = 1200mm (thickness 20mm) PRIMARY MIRROR
Rs 5700
8" F/6 D = 200mm / F = 1200mm (thickness 25mm) PRIMARY MIRROR
Rs 9660
10" F/5 D = 250mm / F = 1250mm (thickness 35mm) PRIMARY MIRROR
Rs 14700
12" F/5 D = 300mm / F = 1500mm (thickness 35mm) PRIMARY MIRROR
Rs 30000
16" F/4.5 D = 400mm / F = 1800mm (thickness 45mm) PRIMARY MIRROR
Rs 83000
 
SPECIAL TELESCOPE MIRRORs - On Order
6" F5 D = 153mm / F = 750mm (thickness 20mm) PRIMARY MIRROR
Rs 8400
6" F6 D = 150mm / F = 900mm (thickness 20mm) PRIMARY MIRROR
Rs 8040
8" F5 D = 200mm / F = 1000mm (thickness 25mm) PRIMARY MIRROR
Rs 10200
 
QUARTZ PRIMARY TELESCOPE MIRRORs - On Order
8" F6 D = 200mm / F = 1200mm (thickness 25mm) PRIMARY MIRROR
Rs 12900
10" F5 D = 250mm / F = 1250mm (thickness 35mm) PRIMARY MIRROR
Rs 21000
12" F5 D = 300mm / F = 1500mm (thickness 35mm) PRIMARY MIRROR
Rs 40800
 
Why quartz?
Quartz glass is actually fused silica—a very pure glass with an extremely high melting point. Fused silica has been used for decades for research grade telescopes in the making of 0.5 to 3-meter size telescope range. Quartz, however, has been traditionally far too expensive for the amateur market. Our mission is to bring quartz to the amateur market at an affordable cost.
 
Quartz is stronger than Pyrex (borosilicate glass)
Another significant advantage with quartz is the expansion due to thermal absorption is six times less than Pyrex, which has been the gold standard in mirror blanks for years. This means your telescope will be producing sharper images while your neighbor is still trying to cool down and stabilize his mirror.
 

 
Secondary Mirror Flats 1/12th wave Diagonal by GSO - Made in Taiwan
Secondary flat mirror 1/12 wave (DIAGONAL) are optically flat yield optimum performances when combined with above astronomical mirrors. Each mirror is aluminized and over coated.

GSO offer secondary flat telescope mirrors to match the complete telescope set request. Our elliptic flat mirror has the same high optical quality as our parabolic primary mirrors using BK7 quality glass. All of the mirror surface quality over 1/12 wave RMS at the least, typically better.

All mirrors have an aluminum reflective coating of 93%. The aluminum coating is protected by a quartz overcoated to make the layer durable against aging effects.
Astronomical Secondary Ellipticals   Add 18% GST
28mm Diameter 28mm (minor Axis) / 5mm thick
Rs 840
31mm Diameter 31mm (minor Axis) / 8mm thick
Rs 1200
46.5mm Diameter 46.5mm (minor Axis) / 10mm thick
Rs 2100
50mm Diameter 50mm (minor Axis) / 10mm thick
Rs 2280
62.5mm Diameter 62.5mm (minor Axis) / 12mm thick
Rs 2640
70mm Diameter 70mm (minor Axis) / 12mm thick
Rs 3360
80mm Diameter 80mm (minor Axis) / 20mm thick
Rs 7500
88mm Diameter 80mm (minor Axis) / 20mm thick
Rs 10200
104mm Diameter 80mm (minor Axis) / 20mm thick
Rs 12000
 
BK7 is a barium borosilicate optical glass known for its high transmission and clean, clear appearance.  It is by far the most common material for many optical glass applications, because it offers good optical properties and a reasonable price.  It's used often as a standard of comparison for other glass materials.
 
Primary Mirror + Secondary Mirror - COMBINATION
Astronomical Mirror 4.5" F8
Secondary Mirror 28mm
Astronomical Mirror 6" F4
Secondary Mirror 62.5mm
Astronomical Mirror 6" F5
Secondary Mirror 50mm
Astronomical Mirror 6" F6
Secondary Mirror 50mm
Astronomical Mirror 6" F8
Secondary Mirro r 31mm
Astronomical Mirror 8" F4
Secondary Mirror 70mm
Astronomical Mirror 8" F5
Secondary Mirror 62.5mm
Astronomical Mirror 8" F6
Secondary Mirror 50mm
Astronomical Mirror 10" F4
Secondary Mirror 88mm
Astronomical Mirror 10" F5
Secondary Mirror 62.5mm
Astronomical Mirror 12" F4
Secondary Mirror 88mm
Astronomical Mirror 12" F5
Secondary Mirror 70mm
Astronomical Mirror 16" F4.5
Secondary Mirror 88mm
 
 
 
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