Robin. A pretty neat article. Around the time when the comet was visible night and morning, I took a mixture of images on a Star Adventurer with a 300 mm lens. On some of the wide angle images with the standard 18-55 mm lens, I used a diffraction grating. I didn’t do anything with the images at the time, but meant to go back one day. The magnification with a wide angle is quite small though. Although the tail came out very bright and sky had a glow to it, I’m not sure if there was any faint diffraction pattern. I should go back and check in negative format. That was the night my car battery failed when I was out in the countryside and I didn’t know my location 🙁
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