Abstract
Occultations by distant objects of the Kuiper Belt can be done with two strategies To observe the occultations by known large objects which shadow path on Earth is predicted by astrometry To search for serendipitous occultations by smaller objects. We have developped dedicated instrumentation for each strategy : a set of performant portable cameras for multi-sites observations of predicted occultations . multi-fibre instruments associated with rapid camera to perform fast accurate photometry on several targets in large field for serendipitous occultations. We have upgraded a 29 fibres spectrograph, Mefos, by replacing the spectrograph by a fast camera: Miosotys is mounted on the 1.93m telescope of the Observatoire de Haute Provence. The second step is to build UltraPhot, a very performant instrument for multi-object fast photometry on the VLT, with between 60 and 150 fibres and a read-out frequency of 100 Hz in 3 colors. Scientific subjects of Miosotys and UltraPhot are numerous, serendipitous stellar occultations, but also young stellar objects, white dwarfs, exoplanet transits.