All observations by the aperture photometer (PHT-P) and the far-infrared (FIR) camera section (PHT-C) of ISOPHOT included reference measurements against stable internal fine calibration sources (FCS) to correct for temporal drifts in detector responsivities. The FCSs were absolutely calibrated in-orbit against stars, asteroids and planets, covering

We present JHK light curves of eclipsing dwarf novae (IP Peg and HT Cas) obtained with the 4.2m WHT telescope at La Palma and attempt experimental fits on the H-band light curve of IP Pegasi.

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INTEGRAL is an optical fiber system to perform simultaneous two-dimensional spectroscopy (i.e. Integral Field Spectroscopy). It is the last of a serie of optical fiber instruments developed at the Instituto de Astrofisica de Canarias. Since 1998 it is available at the 4.2m WHT as a common user instrument, and it has been used in a number of

Lens galaxies are objects of great interest in extragalactic astronomy and cosmology and were one of the first targets in the history of IFS. We will present new data obtained with INTEGRAL of some gravitational lens systems. Thanks to the very good spectral performance of INTEGRAL-WYFFOS --covering all the optical range at once-- we can discuss