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If narrow field is the priority, I would suggest moving to an f/5 Newt. Why? Only because f/5 is far more forgiving. 1. Much easier to collimate. + 2. Can get away with a less than perfect coma corrector. = You get closer to the theoretical resolution of the system. |
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Erlend Langsrud: @Erlend Langsrud That's exectly what I try next. I have 10" f/5 Newton that I didn't use. For several reasons, I thought the mount was to weak to handle that weapon. But now, I am working on it to make it usable again and to fit my needs. When I look at its images I took a while ago with the knowledge I have today, I think the problems I saw were not related to the mount. Today, I am quite sure, that I can handle it. This way, I increase the focal length to 1270mm times 1,06 with the coma corrector. I did as i mentioned before and bought a new camera (for several reasons the ASI 294MM Pro) with larger pixels than the 183mm. So it is not the perfect match, but it's better than before. CS Christian |
