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We present the characterization of two engineered diffusers mounted on the2.5 meter Nordic Optical Telescope, located at Roque de Los Muchachos, Spain.To assess the reliability and the efficiency of the diffusers, we carried outseveral test observations of two photometric standard stars, along withobservations of one primary transit observation of TrES-3b in the red (R-band),one of CoRoT-1b in the blue (B-band), and three secondary eclipses of WASP-12bin V-band. The achieved photometric precision is in all cases within thesub-millimagnitude level for exposures between 25 and 180 seconds. Along adetailed analysis of the functionality of the diffusers, we add a new transitdepth measurement in the blue (B-band) to the already observed transmissionspectrum of CoRoT-1b, disfavouring a Rayleigh slope. We also report variabilityof the eclipse depth of WASP-12b in the V-band. For the WASP-12b secondaryeclipses, we observe a secondary-depth deviation of about 5-sigma, and adifference of 6-sigma and 2.5-sigma when compared to the values reported byother authors in similar wavelength range determined from Hubble SpaceTelescope data. We further speculate about the potential physical processes orcauses responsible for this observed variability

First Light of Engineered Diffusers at the Nordic Optical Telescope Reveal Time Variability in the Optical Eclipse Depth of WASP-12b