OPTIONAL ACCESSORIES

OPTICAL SYSTEM

 

Aperture 20 inch (512 mm) 

 

Focal Length 4040 mm 

 

Focal ratio f/8

 

Central Obstruction 39%  

 

Back Focus from Primary mirror Surface  (350 mm) 

 

OTA Length  (1208 mm) 

 

Optical Tube Carbon Fiber 

 

Optical Truss Carbon Fiber

 

Dimensions Overall Dimensions (PDF) 

 

Weight (includes manual-focuser and two dovetails)  (73 kg) 

 

 

PRIMARY MIRROR

 

Diameter 20 inch (512 mm) 

 

Clear Aperture  (508 mm) 

 

Focal ratio f/3 

 

Mounting Laser Collimated and Permanently Fixed 

 

Material Precision Annealed Supremax

 

Coating Enhanced Aluminum - 96% 

 

 

SECONDARY MIRROR

 

Diameter  (185 mm) 

 

Material Precision Annealed Supremax

 

Shape Hyperbolic 

 

Coating Enhanced Aluminum - 96% 

 

 

LENS GROUP (Flattner optional)

 

Diameter 102 mm  0.75x 

 

Number of lenses 3 

 

Coating Broadband AR Coatings (less than .5% reflected from 400 to 

 

700nm)

 

 

 

 

ACCESSORIES : Focuser Feather Touch 3.5"

 

                            Black Shroud dust cover

                            Wooden case for wordwide shipping

 

                            Optics test report

 

                            Warranty 2 years