Filter type: Alphabetical

Air

This is not a filter as such but is the position where the empty (i.e. no filter) position in each of the 3 interlocking filter wheels line up. The light collected will only be limited to the range of frequencies the CCD can see.

Bessell B

Wavelength Width (Å): 
890
Wavelength Center (Å): 
4361
UCD electromagnetic spectrum identifier: 
em.opt.B

Bessell I

Wavelength Center (Å): 
7980
UCD electromagnetic spectrum identifier: 
em.opt.I
Wavelength Width (Å): 
1540
RTI filter code: 
BI

Bessell R

Wavelength Center (Å): 
6407
UCD electromagnetic spectrum identifier: 
em.opt.R
Wavelength Width (Å): 
1580
RTI filter code: 
CR

Bessell U

Wavelength Center (Å): 
3500
UCD electromagnetic spectrum identifier: 
em.opt.U
Wavelength Width (Å): 
500
RTI filter code: 
BU

Bessell V

Wavelength Center (Å): 
5448
UCD electromagnetic spectrum identifier: 
em.opt.V
Wavelength Width (Å): 
840
RTI filter code: 
CV

D51

Wavelength Center (Å): 
150
UCD electromagnetic spectrum identifier: 
em.opt.V
Wavelength Width (Å): 
5150
RTI filter code: 
D51

H alpha

Wavelength Center (Å): 
6563
UCD electromagnetic spectrum identifier: 
em.line.Halpha
Wavelength Width (Å): 
300
RTI filter code: 
CA

H beta

Wavelength Center (Å): 
4860
UCD electromagnetic spectrum identifier: 
em.line.Hbeta
Wavelength Width (Å): 
300
RTI filter code: 
HB

ND2

Reflective neutral density filter. This filter is always used in conjunction with another filter and reduces the intensity of light that hits the CCD by a factor of 100.

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