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This paper studies about the 130-cm Devasthal Fast Optical Telescope (DFOT) at Devasthal, India that has been in operation for more than 10 years and is the main workhorse for the photometric observations for a wide range of scientific programs carried out at ARIES, Nainital. Having a 2 k × 2 k pixel imager mounted on the prime focus of the telescope, DFOT provides a field of view of about 1 8 × 1 8 arcmin2 in the sky. Another frame transfer CCD imager of 5 1 2 × 5 1 2 pixel size enables monitoring transient sources with millisecond temporal resolution. DFOT is equipped with a filter assembly having eight filters, an auto-guider, an All Sky Camera, and GPS-enabled weather monitoring system to support the observations in the most optimum way. The telescope is capable of producing sub-milimag photometric stability which has allowed us to detect many small-scale photometric variations. [ABSTRACT FROM AUTHOR]