As of 2/17/08 DGM Optics OA Series
telescopes are available only as Optical Tube Assemblies or Optics Sets
As a service to our customers, DGM
Optics can now provide interferometric data for individual primary or secondary
optics. The interferometric data reports are provided via e-mail. The cost is
$60.00 for each report.
Click
Here for sample images.
Please contact us with any questions about the OA-SeriesÔ specifications.
|
Telescope
Specifications |
The OA-3.6ATS |
The OA-4.0 |
The OA-5.1ATS |
The OA-6.5ATS |
|
Clear Aperture |
92 mm + /- 1 mm |
98 mm + /- 1 mm |
130 mm +/- 2 mm |
165 mm +/- 2 mm |
|
Focal Length |
1020 mm +/- 2% |
1020 mm +/- 2% |
1410 mm +/- 2% |
1720 mm +/- 2% |
|
Secondary |
1.3 minor axis elliptical flat |
1.18 minor axis elliptical flat |
1.56" minor axis elliptical flat |
1.83" minor axis elliptical flat |
|
Airy Disc size |
13 microns |
13 microns |
14 microns |
13 microns |
|
Spot Size at .25 degrees off-axis |
20 x 17 microns |
20 x 17 microns |
22 x 20 microns |
33 x 30 microns |
|
Limiting Magnitude |
11.1 |
11.1 |
12.1 |
12.9 |
|
Theoretical Resolution Limit |
1.14" |
1.14" |
.89" |
.70" |
|
Min./Max. Magnification |
25 / 255 |
25 / 255 |
35 / 350 |
32 / 440 |
|
Coatings |
96% for Secondary 89% for Primary |
96% for Secondary 89% for Primary |
96% for Secondary 89% for Primary |
96% for Secondary 89% for Primary |
|
Focuser |
2" Crayford low profile (standard) |
1.25" Low Profile Helical (standard) |
2" Crayford low profile (standard) |
2" Crayford low profile (standard) |
|
Tube Length/Diameter |
40" x 6.1" |
43.75" x 6.1" |
55" x 8 " |
65.5" x 10.2 " |
|
Tube Weight |
PVC 7 lbs. Aluminum 6 lbs. |
PVC 7 lbs. Aluminum 6 lbs. |
Aluminum 13 lbs. |
Aluminum 17 lbs. |
|
Optics
Sets Specifications |
The OA-5.5 |
The OA-7.0 |
The OA-9.0 |
|
Clear Aperture |
139 mm +/- 2 mm |
178 mm +/- 2 mm |
228 mm +/- 2 mm |
|
Focal Length |
1410 mm +/- 2% |
1720mm +/- 2% |
2185 mm +/- 2% |
|
Secondary |
1.56 minor axis elliptical flat |
1.83 minor axis elliptical flat |
2.6" minor axis elliptical flat |
|
Airy Disc size |
13 microns |
12 microns |
12 microns |
|
Spot Size at .25 degrees off-axis |
22 x 20 microns |
33 x 30 microns |
48 x 45 microns |
|
Limiting Magnitude |
12.4 |
13.2 |
13.9 |
|
Theoretical Resolution Limit |
.83" |
.65" |
.51" |
|
Min./Max. Magnification |
35 / 350 |
32 / 440 |
39 / 545 |
|
Coatings |
96% for Secondary 89% for Primary |
96% for Secondary 89% for Primary |
96% for Secondary 89% for Primary |
|
Recommended Focuser |
2" Low Profile Helical (standard) |
2" Low Profile Helical (standard) |
2" Crayford Focuser |
|
Required Minimum Tube Length/Diameter |
59 x 8.0" |
73 x 10.2 " |
82" x 14.2 " |