Filters

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.

Aristarchos filters for CCD imaging

Emission line filters

Emission line CWL (Å) BW (Å) T max (%) Diameter (mm)
[O II] 3726+ [O II] 3729 3731 25 69.91 64
He II 4686 4690 30 76.57 64
Ηβ 4861 4865 30 77.7 64
[O III] 5007 5011 30 83.91 64
[O III] 5007 gal. set 5035 80 85.34 64
[O III] 5007 gal. set 5100 80 88.33 64
[O III] 5007 gal. set 5200 80 88.35 64
CONT. BLUE 5700 70 90.81 64
[O I] 6300 6304 30 87.22 64
Hα 6563 6567 17 69.6 64
Hα 6563+[N II] 6583 6578 40 88.02 64
[N II] 6583 6588 17 79.6 64
CONT. RED 6680 100 77.57 64
[S II] 6717 + 6731 6727 40 81.6 64

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Strömgren filters

Emission line CWL (Å) BW (Å) T MAX (%) Diameter (mm)
u 3500 330 69.60 64
b 4110 170 96.03 64
v 4680 180 91.57 64
y 5490 240 80.87 64
z >8319   97.82 64

 

 

 

 

 

 

 

 

Broad band filters

Band
CWL (Å)
BW (Å)
T max (%)
Diameter (mm)
370
1000
56.0
64
430
2000
68.0
64
530
2200
85.0
64
560
3500
83.0
64
780
4000
89.0
64