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IRDK 12.5 (Infrared Optimized)

SKU# 125120Q

Price: $14,000.00


The IRDK12.5 is a 12.5-inch infrared-optimized optical tube designed for research applications where on-axis performance is crucial.

  • IRDK 12.5 Astrograph (320mm), infrared-optimized with quartz glass optics
  • Dall-Kirkham design with a coating optimized for the transmission of infrared or ultraviolet wavelengths
  • 3″ dovetail, 2,541 mm focal length (f/8)
  • Hedrick focuser (without EFA kit), prepared for Delta T Heater



Optical System

Aperture 12.5 inch (318 mm)
Focal Length 2541 mm (100.04 inch)
Focal ratio f/8
Central Obstruction 42% of the primary mirror diameter
Back Focus from Mounting Surface 10.445 inch (265 mm)
Back Focus from Racked in Focuser 7.2 inch (183 mm)
OTA Length 31 inch (787 mm)
Optical Tube Carbon fiber
Dimensions Overall Dimensions (PDF)
Weight (includes manual-focuser and dovetail) 46 lbs (20.9 kg)
Weight (includes electronic-focuser and dovetail) 48.5 lbs (22.0 kg)
Optimal Field of View 52mm image circle

Secondary Mirror

Diameter 4.65 inch (118 mm)
Material Fused silica (quartz)
Shape Spherical
Coating Protected Gold

Primary Mirror

Optical Diameter 12.5 inch (318 mm)
Outer Diameter 13 inch (330 mm)
Shape Prolate ellipsoid
Material Fused silica (quartz)
Coating Protected Gold


Crated Shipping Weight 163 lbs   (73.9 kg)
Crate Width 22 inch   (559 mm)
Crate Height 29 inch   (737 mm)
Crate Length 48 inch   (1,219 mm)

Included Items

Included Items

Motorized 2.75″ Hedrick Focuser Offers 1.3″ of focuser travel and takes up 3.25″ of backfocus. Requires the 125901 EFA kit sold separately
Heating elements for dew prevention The heating pads on the primary and secondary mirror require the 600195 Delta-T controller sold separately
OTA Cover To protect the primary mirror and inside of the optical tube
Flashdrive Contains software and instructions for collimation and spacing the primary to secondary mirror
Cable connector for fan power Provides a connection method for powering for the fans if the user does not have the 125901 EFA kit. User must provide 12VDC powersupply 2.1 barrel jack connector that is center positive. (Not included for European orders)
Wrench Set (5812A35) Standard hex wrenches (European orders only)



For warranty information please check our Standard Warranty Page.