The tables give the above-atmosphere AB apparent
magnitudes which yield 1 detected photon/sec for an observation made
at the zenith in clear conditions.
(Number of photons
= number of counts CCD gain; gain typically
1.)
The response curves of the Harris filters are given in La Palma technical
note 96 (note that the throughput of the Harris B filter is believed to be
about 30% lower than that of the older KPNO B filters).
Table: Imaging Instruments with broadband filters
Count rates for the JKT Peoples' Photometer were given in Gemini 35 (March 1992).