Phone: (256) 723-8381

Imaging Dall Kirkham Astrograph

"I guess you can tell I am quite happy with the [iDK] scope and highly recommend them.  I have to thank Dave for the effort of design and build of my new iDK.  I don't ever intend to sell it."  Gerald Miller - OK, USA

Welcome AstroBin users! 

Mention your AstroBin user name and receive a free Thermal Control System with any iDK purchase.... a savings of $975!

17" F6.7 Imaging Dall Kirkham, .94 Strehl in stock! 

Ultra-portable 30 lbs 10" F6.7 Imaging Dall Kirkham with ultra-low expansion fused quartz optics!

AG Optical Systems 10" iDK

Contact AG Optical Systems for details.

AG Optical Systems' Imaging Dall Kirkham (iDK) astrographs are high resolution, premium quality instruments with outstanding on and off axis performance across a huge 60mm field of view. By combining large aperture, medium focal ratio, corrected optical grade fused quartz in a lightweight, stiff, and thermally stable carbon fiber tube AG Optical Systems has created a 100% made-in-the USA instrument capable of capturing stunning images of our universe. 

We invite you to compare our quality, customer service, and performance to that of our competition.  You will quickly see that where others cut corners we incorporate quality, where others wait days or weeks to respond to your inquiries we respond within hours.  Contact AG Optical Systems to experience the quality, innovation, and performance that forms the foundation of everything we do. 

Can your telescope produce this type of image?   If not call AG Optical Systems!     Telescope specs are listed below.

M81 by Dan Wilson, AG Optical Systems 17" iDK 

M81 by Dan Wilson, AG Optical Systems 17" Imaging Dall Kirkham 

Now available with Optec's new Gemini rotating focuser with temperature compensation! 

Ultra thermally stable optical grade fused quartz optics and optical quality test reports are included as standard with all AG Optical Systems Imaging Dall Kirkham telescopes.  We know you don't compromise when it comes to your images so why should we?



Imaging Dall Kirkham Astrograph Features
  • High-performance, ultra-low expansion optical grade FUSED QUARTZ optics figured and quality tested as a system by Ostahowski Optics.  Optical quality test report included with every telescope.
  • Fast F6.7 system designed and baffled to cover 50mm and larger size chips. Click here to see CCD Inspector analysis of a 17" iDK over a 43' x 29' field of view.
  • Over 6.25" of back focus to support almost any combination of imaging components
  • Excellent coma free, astigmatism free, flat field performance over 60 mm image circle. Ckick here and here to see the performance of a 12.5" iDK using a camera with a 2" diagonal chip (36mm x 36mm array, 52mm diagonal).
  • RMS spot diameter* less than 9 microns across 60 mm image circle from .380 to 1 microns (we state RMS spot size in diameter rather than radius as do other manufacturers)

             * Spot diagrams:  

12.5" iDK 14.5" iDK 17" iDK 20" iDK 24" iDK

  • Highly robust, precise Optec TCF-S3i focuser is standard, included in price.   Optec Gemini rotating focuser upgrade option.  
  • High reflectivity 96% coatings produced in Ostahowski Optics' state-of-the-art coating chamber
  • Outstanding field illumination across big chip cameras. Click here to see an unprocessed iDK image taken by a 16803 CCD camera that has not been flat fielded.
  • Carbon fiber truss tube engineered to provide rigidity and thermal stability.
  • CNC machined components with stainless steel fasteners
  • Best  in class customer support and pricing


System Specifications                                                                          

Model iDK12.5  iDK14.5  iDK17 iDK20 iDK24
Aperture 12.5 14.5 17" 20" 24"
Focal ratio 6.7 6.7 6.7 6.7 6.7
Focal length 83.5" 97.2" 114" 134" 160.8"
Back focus (at mid travel of focuser) 6.5" with Optec TCF
6.5" with Optec TCF
6.25" with Optec TCF
7.5" with Optec Gemini
7" with Optec Gemini
OTA type CF Truss CF Truss CF Truss CF Truss CF Truss
Fans (blowing air into OTA)  3 x 60mm  fans    3 x 60mm fans 3 x 80 mm fans 3 x 80 mm fans 3 x 80mm fans
Secondary obstruction 6.7" 7.5" 8.2" 9" 11"
Focuser (included)  Optec TCF-S3i 3" temperature compensating digital focuser
Optec Gemini rotating focuser
Corrector Two element,
<.5% reflection broadband AR coated on every lens surface
Optics Ultra thermally stable optical grade FUSED QUARTZ primary and secondary mirrors, 96% Enhanced
Aluminum, coated by Ostahowski Optics. Optical quality report (interferometry)
provided with each system.
Baffling primary and secondary baffles, baffled for 2" diagonal size chip
Dovetail Heavy-duty, Losmandy "D" compatible dovetail plate included
Tube length 30" 36" 42" 47" 56"
Dimensions Here Here Here Here Here
OTA Weight approx. 44 lbs approx. 54 lbs approx. 102 lbs approx. 141 lbs approx. 185 lbs
OTA weight with dovetail &  focuser approx. 52 lbs approx. 58 lbs approx. 110 lbs approx. 150 lbs approx. 200 lbs
Price $12,995
(includes Optec TCF focuser)
(includes Optec TCF focuser)
(includes Optec TCF focuser)
(includes Optec Gemini)
(includes Optec Gemini)
Optec Gemini rotating focuser upgrade $1695 $1695 $1695 included included
AGO Thermal Control System $975 $975 $975 $975 $975
Shroud $125 $135 $140 included included
Piggyback Dovetail Plate $225 $245 $265 included included
Crating $250 $275 $375 $475 $550
Spacers & Adapters Contact AG Optical Systems
Delivery Contact AG Optical Systems
Shipping Contact AG Optical Systems

12.5" iDK Truss Astrograph

Solidworks CAD model of 12.5" Imaging Dall Kirkham astrograph

IC410 by Tim Khan, AG Optical Systems 12.5" iDK, 16803 2" diagonal CCD chip 

AG Optical Systems 12.5" Imaging Dall Kirkham secondary spider assembly

AG Optical Systems 12.5" Imaging Dall Kirkham Truss Structure

AG Optical Systems Thermal Control System

M81 by Dan Wilson, AG Optical Systems 17" iDK, SBIG STLX camera

NGC6960 by Mike Miller, AG Optical Systems 12.5" Imaging Dall Kirkham, Apogee camera