T-ReCS contains up to 20 filters mounted in two wheels. This page describes the current set of filters.

Filter Name	Central lambda (µm)	lambda Range (50% trans., µm)	Trans. Curve	Trans. Data	Temp (K)	Notes
N'	11.2	10.1 - 12.5			10
N (broad 10um)	10.36	7.70 - 12.97			15
Si-1	7.73	7.39 - 8.08			77
Si-2	8.74	8.35 - 9.13			77
Si-3	9.69	9.22 - 10.15			77
Si-4	10.38	9.87 - 10.89			77
Si-5	11.66	11.09 - 12.22			77
Si-6	12.33	11.74 - 12.92			77
[Ar III]	8.99	8.93 - 9.06			10	(a)
[S IV]	10.52	10.37 - 10.54			10
[Ne II]	12.81	12.68 - 12.91			10
[Ne II] cont	13.10	12.95 - 13.17			10	(b)
PAH 8.6um	8.59	8.38 - 8.81			10	(c)
PAH 11.3um	11.30	10.98 - 11.59			10
Qa	18.30	17.57 - 19.08			25
Qb	24.56	23.62 - 25.54			25
Q (broad 20.8um)	20.68	17.41 - 25.40			25	(d)
K	2.19	1.98 - 2.39			77	(e)
L	3.85	3.56 - 4.14			77	(e)
M	4.68	4.39 - 4.96			77	(e)

The temperature is that of the filter measurement (there is only a very small change in bandpass between 77K and the operating temperature). 

Notes:

(a) Also used as continuum reference for PAH 8.6um filter.

(b) Normally used as continuum reference for [NeII] filter.

(c) Also used as continuum reference for [Ar III] filter

(d) The Q-broad filter is only recommended for spectroscopy mode. Use with imaging mode will result in saturated images given the width of the band.

(e) The K, L and M filters are useful for target acquisition (of bright targets) but are not routinely available for science observations due to the low detector efficiency at short wavelengths.