Imaging Dall Kirkham Astrograph
AG Optical Systems 14.5" iDK now
available!
Imaging Dall Kirkham (iDK) astrographs are
high resolution instruments with outstanding on and off axis
performance (sub 6 micron RMS across 70mm image circle). By combining large aperture, medium focal ratio,
corrected optics in a lightweight, stiff, and thermally stable
carbon fiber tube AGO has created an instrument capable of capturing
stunning images of our universe.
An optional quartz upgrade is now available
for all iDK telescopes. Quartz' extremely low coefficient of
thermal expansion allows the figure on the optics to remain stable
while ambient temperatures vary. This means you will spend
more time imaging and less time waiting for the optics to stabilize.
UPDATE
(May 2013): AG Optical Systems is building several 12.5" iDK
astrographs. One is currently available with a 4 to 6 week
lead time.
Features
| Imaging Dall Kirkham
Astrograph Features |
- Optics figured and
quality tested as a system. Optional quartz upgrade for
the ultimate in optical stability as ambient
temperatures vary.
- Fast F6.7 system designed and baffled to cover 16803
size chip
- 5" to 8.5" of back focus to support almost any
combination of imaging components (dependent upon
focuser selected)
- Excellent coma free, astigmatism free, flat field
performance over 70 mm image circle. Ckick
here to see the performance of a 12.5" iDK at the
corner of a 2" diagonal chip (36mm x 36mm array).
- RMS spot diameter* less than 6 microns across 55 mm
image circle
* Spot diagrams:
12.5" iDK,
14.5" iDK,
17" iDK
|
-
Highly robust, precise Optec TCF-S3i focuser is
standard. Optional FLI Atlas focuser.
- 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
|
System Specifications
|
Model |
iDK12.5 |
iDK
14.5 |
iDK17 |
iDK20 |
| Aperture |
12.5 |
14.5" |
17" |
20" |
| Focal ratio |
6.7 |
6.7 |
6.7 |
6.7 |
| Focal
length |
83.5" |
97" |
114" |
134" |
| Back focus
|
5.25" with Optec TCF
|
5.25" with Optec TCF
|
5" with Optec TCF
|
5" with Optec TCF
|
| OTA type |
Truss |
Truss |
Truss |
Truss |
| Primary and
secondary
mirrors |
Supremax
33 substrate. Optional quartz upgrade. |
|
Fans (blowing air into OTA) |
3 x 60mm fans |
3 x 60mm fans |
3 x 80 mm fans |
4 x 80 mm fans |
|
Secondary obstruction |
6.7" |
7.3" |
8.2" |
9" |
|
Focuser (included) |
Standard: Optec TCF-S3i
3" temperature compensating digital focuser
|
| Corrector |
85mm two element,
broadband AR coated |
90 mm two element,
broadband AR coated |
| Mirror
Coatings |
Enhanced
Aluminum |
| Baffling |
primary and secondary
baffles, baffled for 16803 size chip |
| Dovetail |
Heavy-duty, Losmandy
"D" compatible dovetail plate included |
| Tube length |
30" |
35" |
40" |
45" |
| Tube weight
with dovetail & focuser |
approx. 62 lbs |
approx. 86 lbs |
approx. 100 lbs |
approx. 145 lbs |
|
Price |
$10,695 |
$15,395 |
$20,595 |
$29,995 |
| Quartz
upgrade (both mirrors) |
$1250 |
$2000 |
$2500 |
$4500 |
| AGO
Thermal Control System |
$975 |
$975 |
$975 |
$975 |
| Shroud |
$125 |
$135 |
$140 |
$165 |
|
Piggyback Dovetail Plate |
$225 |
$245 |
$265 |
$305 |
| Spacers
& Adapters |
Contact AG Optical
Systems |
| Delivery |
approx. 4 months |
| Shipping |
contact AGO |
12.5" iDK Truss Astrograph
Solidworks CAD model of 12.5" Imaging
Dall Kirkham astrograph
Carbon Fiber Mirror Bucket
17" iDK Truss Astrograph
AG Optical Systems Thermal Control System