39 inch Reflector, La Palma

The Jacobus Kapteyn Telescope (JKT) has a parabolic primary mirror of diameter 1.0 m with two interchangeable secondaries. It is equatorially mounted, on a cross-axis mount, which allows operation east or west of the pier. Normally it is east of the pier. There is a choice of two secondary mirrors. The f/8.06 Harmer-Wynne system uses a spherical secondary and a doublet corrector to give a field of 90 arcmin diameter for photographic astrometry over a wide field. The other secondary is a hyperboloid, which gives a conventional f/15 Cassegrain focus. The JKT normally operates in f/15 mode. (Ref: http://www.ing.iac.es/PR/jkt_info/jktgeneral.html)

Sadly, a Grubb Parsons telescope no longer in use, see ; http://www.ing.iac.es/Astronomy/telescopes/jkt/

Pictures of the JKT: http://www.ing.iac.es/PR/archive/jkt/jkt.html