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.