This image consists of only two hours of integration time, including twenty minutes of luminosity. These are far too short integration times for narrow-band sub-exposures. That is why this image is very noisy, - with distinct graininess at full resolution.
Producing quality optics is a labour-intensive process. After coarse and fine grinding to the target focal length, the work consists of polishing and testing, polishing and testing and still more polishing and testing.
The ASA DDM 160 mount, controlled by Autoslew, was tracking on the comet for ten minutes. The monochrome Apogee U16M camera made two minute exposures five times consecutively through red, green, blue and luminance filters.