This manual describes step-by-step instructions on how to quickly focus the Danish DK 1.54m telescope using the DFOSC (Danish Faint Object Spectrograph Camera) imager. The danish telescope at the ESO/La Silla observatory in Chile has been a flag-ship instrument for the acquisition of high-quality, time-domain astrophysical data in the field of extrasolar planets, asteroids, stars and artificial satellites. This field trip will enable continued observations of astrophysical objects and aims to report the results to the general public. Available instruments: * DFOSC imaging camera (Filter wheel B; Halpha, empty, U, B, V, R, I; Filter Wheel A: Strømgren uvby, CN, OIII, empty). * EMCCD Two-Color Instrument (TCI) red and vis camera. * DFOSC spectrograph. ################################################################################# Documentation: * https://www.eso.org/public/teles-instr/lasilla/danish154/ * https://www.eso.org/public/unitedkingdom/teles-instr/lasilla/danish154/dfosc/?lang * https://www.eso.org/sci/facilities/lasilla/telescopes/national.html * https://www.aanda.org/articles/aa/abs/2015/02/aa25260-14/aa25260-14.html * https://space.asu.cas.cz/~dk154/telstatus.html * https://en.wikipedia.org/wiki/La_Silla_Observatory ################################################################################# Acknowledgments: The work presented here is supported by the Carlsberg Foundation, grant CF25-0040. https://www.carlsbergfondet.dk/en https://en.wikipedia.org/wiki/Carlsberg_Foundation #################################################################################