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Hi gang, I have a small issue with my CPC & need some information from other CPC owners. Basically I was having a look at the Fastar connection for Hyperstar but noticed that the whole Secondary assembly was a little loose & could be rotated on its own leaving the corrector plate securely fixed. Here’s where I made my first mistake, I lost track of the original starting position of the assembly but it didn’t end there. The only way to tighten the assembly & stop it rotating freely the corrector plate needs to be removed as the Secondary unit is tightened on the underside of the corrector. Next mistake, I forgot to mark the corrector position to aid refitting, not considering the fact that it’s position would be important on reassembly. Turns out that my corrector has no significant markings on it except in 2 places on the edge, about 45° apart are an arrow pointing to the outer face & the number 4. Through much head scratching & the use of digital calipers I think I have found the correct orientation of the corrector plate in order to reassemble but I am still stuck with not knowing the correct position of the Secondary assembly. I have read various articles that contradict each other stating that one of the 3 collimating screws should be at 12o’clock or 6o’clock. What I have noticed though is that when the outer retaining ring is unscrewed from the Secondary assembly, there is a small locating grub screw that sits within a slot on the assembly housing, see pic: a big ask I know but is it possible for other CPC owners, mine being a 9.25” if it matters, to unscrew the Secondary retaining ring & note the position, on a clock face (top of OTA as 12), of this locating slot. It would be much appreciated. Thanks I know there’s plenty of discussion pertaining to Primary & Correctors as marching sets, although from what I gather this was for earlier SCT models, plus 365 Astronomy lists the corrector as a replacement part: https://www.365astronomy.com/Celestron-C9.25-Replacement-Corrector-Plate-50984-1S.html so I’m hopeful that nowadays the matched pair issue is not relevant & ive got away with my stupid mistake. Regards.., Kirk
Hi guys, I need a guide for a "long run" purchase plan. Long Story Short: I want to buy colour CCD or CMOS camera for DSO via my SW 130PDS, and cannot decide as here the Long Story kicks in!: I am almost sure, in few years distance, I will go for a Hyperstar Solution. I am only 2 years in Ap hobby and these clouds are KILLING ME! London is not the best place for such a hobby, - I am sure you all will agree on that. So, to get the best of that "one clear night a month", - Hyperstar is probably the only option... or, alternatively, simply emigrate to LaPalma... I am 99% sure I will go Hyperstar way sooner or later, and like everyone, I hit the budget wall. I look for cam in around £1k, Hyperstar will cost around £1k and plus the scope minimum £1k. I am not the lucky one who can afford it in one go, so I think to by cam which will be usable with Hyperstar in the future and here are some question I have googled and googled and could not found out: 1) of course, which cam, I think of ZWO ASI1600MC PRO or ASI294MC PRO. I am sure, both will perform OK on SW 130PDS, but what about Hyperstar??? And the next Q goes in relation; 2) My wallet will be able to afford something like EdgeHD 8" (+ Hyperstar), however, these ZWO cams are sooo big and I afraid 8" aperture will be too small as ZWO may place too much shadow while sitting on the Hyperstar - anyone tried them on EdgeHD 8" ?; 3) If HD 8" is too small, I am sure, EdgeHD 9.25 is too expensive for my wallet, is there any alternative for 9" CSC + Flattener + Hyperstar to make a setup cheaper than HD 9.25" price (insane price difference... insane!).. 4) Or maybe, - I had to start with the question, - which is the ideal colour cam for HedgeHD 8", but if there are any cheaper options with larger Aperture + Flattener, - why not? All goes on NEQ6 mount, - back garden in London, Woolwich.... with LP level which I call "the constant Polar Day". P.S. Why Colour cam? Filter prices! I want to avoid them till I will win a lottery.