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

AG Optical Systems' Imaging Dall Kirkham (iDK) astrographs are high resolution, premium quality instruments with outstanding on and off-axis performance across a huge 50 mm 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 50 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  

  • Highly robust, precise Optec TCF-S3i 3" digital focuser and Optec Gemini rotating focuser options.  
  • 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 iDK10 iDK12.5  iDK14.5  iDK17 iDK20
Aperture 10" 12.5" 14.5" 17" 20"
Focal ratio 6.7" 6.7 6.7 6.7 6.7
Focal length 67" 83.5" 97.2" 114" 134"
Back focus (at mid travel of focuser) 6.25" with Optec TCF 6.4" with Optec TCF
6.6" with Optec TCF
6" with Optec TCF
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 60mm fans 3 x 80 mm fans 3 x 80 mm fans
Secondary obstruction 5.6" 6.7" 7.5" 8.2" 9"
Focuser Options  Optec TCF-S3i 3" Temperature Compensating Digital Focuser
or Optec Gemini Rotating Focuser or Moonlite NiteCrawler
Corrector Two element,
<.5% reflection broadband AR coated on every lens surface
Optics Ultra thermally stable optical grade FUSED QUARTZ primary and secondary mirrors are standard, 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 26" 30" 36" 42" 47"
Dimensions   Here Here Here Here
OTA Weight approx. 29 lbs approx. 44 lbs approx. 54 lbs approx. 102 lbs approx. 141 lbs
OTA weight with dovetail &  focuser approx. 32 lbs approx. 52 lbs approx. 59 lbs approx. 110 lbs approx. 150 lbs
OTA Price with quartz optics $8,795 $9,495
Optec TCF-S3i 3" digital focuser option $1400 $1400 $1400 $1400 $1400+975+125+225
Optec Gemini rotating focuser option $3095 $3095 $3095 $3095 $3095
Moonlite NiteCrawler rotating focuser Contact AG Optical Systems
AGO Thermal Control System $975 $975 $975 $975 $975
Shroud $105 $125 $135 $140 $175
Piggyback Dovetail Plate $200 $225 $245 $265 $295
Crating $225 $250 $275 $375 $475
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

AG Optical Systems 12.5" Imaging Dall Kirkham secondary spider assembly

AG Optical Systems 12.5" Imaging Dall Kirkham Truss Structure

AG Optical Systems 12.5" Imaging Dall Kirkham Backplate

AG Optical Systems Thermal Control System

AG Optical Systems 12.5" Imaging Dall Kirkham Primary Baffle

AG Optical Systems Imaging Dall Kirkham Lycra Shroud

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