Dall-Kirkham Optical Tube Assembly 24”

Part#: 240120

Price: $55,000.00

This is a Dall-Kirkham optical design with coatings that are optimized to transmit in infrared or ultra violet wavelengths.  It is diffraction limited across a 20mm image circle at the focal plane.  There are no refractive lens, only reflective components to the design.  For IR application, reflectives coatings are a protected gold which give better than 98% reflectivity from .65 micron (650nm) to 5 micron (5000nm).  This design is ideal for infrared astronomy or LIDAR applications.  UV optimized coatings can also be used at an additional cost.

 

Features:

Optimized Coatings Primary and Secondary mirror coating can be optimized for Infrared or UV applications  
Carbon Fiber Truss Design Minimizes thermal expansion which causes focus shift with changes in temperature
Dovetail expansion joint Allows for the difference in thermal expansion between carbon fiber and aluminum. The expansion joint allows the aluminum dovetail expand and contract without stressing the carbon fiber lower truss  
Cooling Fans Three cooling fans ejecting air from the back of the telescope and four fans blowing across the boundary layer of the mirror surface. This helps the telescope to reach thermal equilibrium quickly. The fans are controlled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.  


OPTICAL SYSTEM

Aperture 24 inch (610 mm)
Focal Length 3962 mm (155.98 inch)
Focal ratio F/6.5
Central Obstruction 47% of the Primary Mirror Diameter
Back Focus from Mounting Surface 14.1 inch (358 mm)
Back Focus from Racked in Focuser 5.81 inch (148 mm)
Weight 240 lbs (108.9 kg)
OTA Length 56 inch (1,422 mm)
Upper Cage Carbon Fiber Truss
Lower Cage Carbon Fiber Truss with Aluminum Light Shroud
OTA Width 31 inch (787 mm)
OTA Height 35 inch (889 mm)
Optimal Field of View 70 mm (58 arcminute)
 

PRIMARY MIRROR

Diameter 24.5 inch (622 mm)
Aperture 24 inch (610 mm)
Focal ratio f/3.2
Mounting Laser Collimated and Permanently Fixed
Material Precision Annealed Borosilicate
Shape Prolate Ellipsoid
Coating IR or UV optimized
 

SECONDARY MIRROR

Diameter 9.45 inch (240 mm)
Material Precision Annealed Borosilicate
Shape Spherical
Coating IR or UV optimized
             
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