Camera filter wheel
The filter unit contains 2 filter wheels with 6 filter stacks each with an optically free diameter of 62 mm. The filter unit can be attached to the four side ports and to the main port.
Wheel 1 is free for use by the astronomer with changeable filters with a thickness up to 5mm. There are 6 filter adapters, which can easily be disassembled from the wheel.
Outside of the filter unit the required filter can be mounted. A protection ring fixes the filter inside the adapter. Then the adapter can be assembled back to the filter wheel by fixation of one screw.
Wheel 2 is occupied with filters U, B, V, R, I and a neutral glass with a thickness of 3mm and an optically free aperture of 64 mm.
The parameters of the optical filters are shown below.
Aristarchos filters for CCD imaging
Emission line filters
Aristarchos filters for MES-AT
Emission Line filters
Emission Line |
CWL(A) |
BW(A) |
TMAX(%) |
Diameter (mm) |
|
|
30 |
76.86 |
50 |
Ca II 3934+HeI 3926 |
|
35 |
84.13 |
50 |
|
|
40 |
72.97 |
50 |
|
|
50 |
86.11 |
50 |
|
|
60 |
90.8 |
50 |
|
|
50 |
82.47 |
50 |
|
|
60 |
83.91 |
50 |
|
|
80 |
83.91 |
50 |
|
|
100 |
88.42 |
50 |
|
|
100 |
88.78 |
50 |
|
|
100 |
87.33 |
50 |
|
|
100 |
87.5 |
50 |
Auto guiding filter wheel
There are 5 optical filters with a thickness of 3mm included in the AGS, which are changeable by use of a motorised filter wheel. Filter stack 1 is occupied with a 3mm compensation glass BK7.
The filter characteristics are shown in the following.
Filter combination B
Combination of:
1mm BG 12
1mm BG 39
1mm GG 385 |
Red filter R
Combination of:
1.5 mm OG 570
1.5 mm KG 3 |
Red Filter R 0.3 R
Combination of:
1 mm NG 5
1 mm OG 570
1 mm KG 3 |
Filter V
Combination of:
1.5 mm BG 39
1.5 mm GG 495 |
Filter I
Combination of:
3 mm RG 9 |
|
|
