ESO & HST Science Instrumental Characteristics

Standard Bandpasses: Search Standard Photometric Systems by characteristics (zeropoints available in most cases)
Filter by Characteristics: Search the ESO and HST filters by their characteristics (and retrieve overall instrument bandpasses when available)
Transmission Curves: Retrieve Overall Instrument Bandpasses
Detectors by Characteristics: Find the detector which better match your science case, using parameters such as: spectral coverage, field of view, pixel scale.

Reference: "Database of Instrumental Characteristics in a Real Observatory",
Micol, A., Sforna, D.,
Astronomical Data Analysis Software and Systems XIV,
ASP Conference Series, Vol. 347, p.534, 2005,
2005ASPC..347..543M

Alberto Micol, ST-ECF, October 2004.