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No expert.
Hi Nick,
I have done it once where I had a real go at it. I took a series of exposures using a 770mm focal length William Optics and using a DSLR. I used Deep Sky Stacker to stack two images, firstly the stars as I was guiding on the stars. The image came out nicely except the comet had streaked. I then tried to stack the images using the comet and had success with this but the stars in the back ground were trailing. I then in photoshop put the two images on top of each other and I think it is Masking rubbed so the bottom image came through so I ended up with a nice star field and lovely green comet. I loved it. I also googled photographing comets and a heap of advice was found.
Good luck
Mark
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