10″ Imaging Dall Kirkham Quartz

FA telescopes FA telescopes

Telescope Name: 10″ Imaging Dall Kirkham

Telescope Price: $9,690 with quartz optics/heaters/temp sensors

Item #: 10IDKTCSHO

NOTE:  Handles on the back plate can interfere with larger focusers such as the Optec Gemini.  Current model 10″ iDK scopes do not have back plate handles.

The AG Optical Systems .25 meter (10 inch) F6.7 Imaging Dall Kirkham (iDK) telescope is an ultra-portable imaging instrument featuring a huge 50mm flat field free of coma, astigmatism, and field curvature. The outstanding optical performance of the 10″ iDK is made possible through the convergence of careful design, state-of-the-art manufacturing, and precise assembly.   Wide field images are captured with high-contrast details and sharp stars across the entire field of view.

The AG Optical Systems F6.7 iDK optical system provides exceptional thermal stability. Optical grade fused quartz optics ensure the figure and focus stability of the 10″ iDK as the temperature changes over the course of an imaging session. When combined with the rigid, thermally stable carbon fiber truss tube assembly of the 10″ iDK you can expect to spend less time focusing and more time collecting data.

The 10″ iDK carbon fiber truss optical tube assembly makes extensive use of carbon fiber composite materials, CNC-machined components, and precision collimation adjustments to provide a rigid and thermally stable platform for the low expansion optics. Two cooling fans speed the cooling of the primary mirror while primary and secondary mirror heaters can be automatically controlled by the optional Thermal Control System (TCS).

The optional, robust, digital Optec Gemini rotating focuser, Optec TCF-S3i, or Optec Leo are ASCOM-compatible focusers capable of precision focusing and rotation while carrying heavy CCD imaging trains

NOTE:  Handles on the back plate of the 10″ iDK can interfere with larger focusers such as the Optec Gemini.  For this reason the handles were removed from the back plate.


Optical Tube Assembly

  • 32 lbs. carbon fiber tube assembly
  • Tube length: 26.65 inches
  • 10″ (.25m) optical grade fused quartz F6.7 optical system
  • 50mm corrected imaged circle, 1.7 degrees
  • Cooling fans, heaters, and temperature sensors
  • Optional Thermal Control System
  • Dust covers
  • All CNC components, all stainless steel fasteners

Optical System

  • 10″ F6.7 corrected optical system with integral field corrector correcting coma, astigmatism, and field curvature
  • Ostahowski Optics mirrors
  • 1674mm focal length
  • 5.6″ secondary obstruction (56% linear obstruction)
  • Performance: 5 micron RMS 15mm off-axis, 6 micron RMS 25mm off-axis
  • 89mm permanently aligned two element corrector with broadband anti-reflection coatings
  • 6.75″ of back focus from Optec Gemini rotating focuser (assumes 1″ extension tube between backplate and Gemini focuser), 5.95″ with Optec TCF-S3i and 3″ FocusLynx
  • 10.25″ back focus from focuser base
  • 96% enhanced aluminum coatings



optec leo 3

Optec Leo 3″ Focuser

Ultra-low profile (1.25″), digital focuser with 20 lbs payload capacity, temperature compensation feature

Price: $1195
Item #: LEO


Truss shroud

Truss Shroud

Heavy Lycra shroud to block stray light, mitigate dust intrusion

Price: $125
Item #: FA10SHROUD

thermal control system

Thermal Control System

Computer-based automated control of primary mirror cooling, primary and secondary mirror anti-dew control

Price: $600


Piggyback Dovetail Plate

CNC-machine 6061 aluminum Losmandy “D” profile piggyback dovetail plate

Price: $215
Item #: FA10PIGGY


  • Carbon fiber optical truss tube assembly
  • Losmandy “D” mount dovetail
  • Primary and secondary dust covers
  • Primary mirror cooling fans with power cable
  • Primary and secondary mirror heaters and temperature sensors
  • Ultra-low expansion Quartz optics with enhanced aluminum coatings
  • All stainless steel fasteners and springs

10″ Imaging Dall Kirkham Spot Diagram

  • .425 through .7 microns wavelength (LRGB)
  • 10 micron pixel size
  • 50mm image circle (on-axis to 25mm off-axis)