Background
The DEIMOS science filters lie in the converging beam directly
between the DEIMOS camera and the CCD dewar window. The
filters are significantly smaller than the LRIS filters,
measuring 6.5×6.5 inches in size.
Broadband Imaging Filters
Filter
Name |
Composition |
Pivot
Wavelength
[Å] |
Equivalent
Width
[Å] |
Response
Curve1 |
Notes |
| B |
2GG385+
1BG12+
3S8612 |
4416 |
373 |
ASCII FITS JPEG |
Vendor: Andover |
| V |
2GG495+2BG39+2clear |
5452 |
628 |
PDF |
Vendor: Andover
New filter, commissioned in Dec 2015 |
| R |
3OG570+3KG3 |
6487 |
810 |
ASCII FITS JPEG |
Vendor: Andover |
| I |
3RG9+3clear |
8390 |
1689 |
ASCII FITS JPEG |
Vendor: Lick |
| Z |
4RG830+2clear |
9085 |
969 |
ASCII FITS JPEG |
Vendor: Lick |
Notes:
- Response curves show two profiles. The top one is the
theoretical filter profile, the bottom one is the theoretical
filter profile convolved with the CCD QE curve.
Long-Pass Order-Blocking Spectroscopy Filters
Filter
Name |
Composition |
Cut-on
Wavelength
[Å] |
Notes |
| BAL12 |
?? |
N/A |
"Clear" filter for spectroscopy without an
order-blocker.
|
| GG400 |
3GG400 + 3WG305 |
4000 |
|
| GG455 |
3GG455 + 3WG305 |
4550 |
|
| GG495 |
6GG495 |
4950 |
|
| OG550 |
6OG550 |
5500 |
|
Narrowband Spectroscopy Filters
Filter
Name |
Composition |
Central
Wavelength
[Å] |
Width [Å] |
Notes |
| NB8560 |
Interference |
8560 (manufacturer)
8563 (measured) |
260 |
Calcium triplet narrowband filter donated by
T. Smecker-Hane. |
| NB8580 |
Interference |
8580 (nominal) |
100? |
Calcium triplet narrowband filter donated by
T. Smecker-Hane, S. Chapman, R. Ibata, M. Rich,
R. GuhaThakurta
Filter bandpass does not meet spec.
Warning: This filter is scratched and is not recommended for use. |
