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Post by Dragon Man on Mar 11, 2020 12:45:31 GMT
Tonight I tested out a new scope even though there is a full moon! You know what it's like. A bit of new kit needs to be tested even if it's raining Anyway, the new scope is a Saxon (Skywatcher, Orion, etc) 150mm 750fl f/5 Imaging Reflector. I tested it last night with a 0.5x Focal Reducer and hated it. Tonight I took out the focal reducer and love it!!!! I am using the IMX178, no filters at all, no Focal Reducer. Just the scope and the camera. Here's 2 pics I saved, stacked and processed to see how it went. KEYHOLE NEBULA AND ETA CARINA (star) in CARINA NEBULA20 SECONDS X 3 stacked in Registax, sharpened in PhotoShop CS5. -------------------------- TARANTULA NEBULA in the LARGE MAGELLANIC CLOUD20 seconds x 3 stacked in Registax, levels and sharpened in PhotoShop CS5. I must admit that I quite like this scope so far. I prefer a wider FOV by using a focal reducer but this scope doesn't allow for that without serious Coma and I am not about to buy a Coma Corrector just yet, so wider field will have to wait. I can live with the star spikes for now. I'm not a fan of them but that's life It will be good to see how this scope improves when the Moon has gone
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Post by Deleted on Mar 12, 2020 10:19:05 GMT
Nice Ken. I like the quality of the reflectors.I have a 150mm 600mm which is f/4 and wish I had got the f5 because of the constant fiddling with collimation. Images are nice enough with f/4 and better quality than I can get with sct's but a lot of work. We have had 3 very clear nights in a row and I have missed all of them cheers Paul
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Post by Dragon Man on Mar 12, 2020 11:05:28 GMT
Thanks Paul.
From all the reviews I have read, the 150/750 f/4 is a pain to get a flat field on and no Coma, whereas the f/5 is a bit more forgiving. And the larger the camera sensor the worse the problem.
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Post by ChrisV on Mar 15, 2020 23:54:24 GMT
Great shots Ken. A fast 6" newt is certainly a good option ! Reasonably portable and great images
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Post by Dragon Man on Mar 16, 2020 10:56:55 GMT
Great shots Ken. A fast 6" newt is certainly a good option ! Reasonably portable and great images Thanks Chris. Portability is definitely not on my list of requirements . . . not unless I decided to start transporting my whole observatory around but yeah, I know what you mean
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