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[Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Cats & Casses Previous   Index   Next   Threaded   Pages: 1 donnie3 Carpal Tunnel Reged: 12/15/04 Loc: bartlesville oklahoma question about celestrons 8" verus 9.25"       #5369121 - 08/14/12 09:45 PM Edit   Reply   Quote Quick Reply   would 1.25" make a lot of difference in what you could see in the area of deep sky.i have a old lx10 8" sct ota. would a celestron 8" with the newer coatings be a better scope for dso. not sure if the extra $ would justify 1.25" more apature. thanks,don Post Extras:       MikeBOKC Post Laureate Reged: 05/10/10 Loc: Oklahoma City, OK Re: question about celestrons 8" verus 9.25" [Re: donnie3]       #5369698 - 08/15/12 08:50 AM Edit   Reply   Quote Quick Reply   From 8 to 9.25 is marginal. You'll get some extra brightness and resolution but not enough to make you say wow. A good rule I have heard many times is that it takes a four-inch increase in aperture in SCTs and Newtonians to show a visible and appreciable difference; maybe 2 inches in refractors. Post Extras:       Stelios Carpal Tunnel Reged: 10/04/03 Loc: West Hills, CA Re: question about celestrons 8" verus 9.25" [Re: donnie3]       #5370111 - 08/15/12 01:02 PM Edit   Reply   Quote Quick Reply   If you have a C8, I wouldn't buy a new C8 or C9.25, I'd go for a C11 at least, or keep what I have. However, if you are decided on upgrading, definitely get a C9.25 rather than a newer C8. The one disadvantage of the C9.25 (on a CG-5) is that it requires an extra counterweight for balance, which combined with the extra 10lbs for the OTA makes it harder to lift and move the assembled scope. But the advantages of a C9.25 are significant in both resolution and light-gathering. If you were to look side by side at a C8 vs a C9.25 and pick one for the evening's observation, you'd never pick the C8. [In case I seem to contradict my earlier statements, what I meant was that although the C9.25 has better resolution/light gathering, this wouldn't be worth the cost of a new scope if I *already* had a C8]. Post Extras:       donnie3 Carpal Tunnel Reged: 12/15/04 Loc: bartlesville oklahoma Re: question about celestrons 8" verus 9.25" [Re: Stelios]       #5370149 - 08/15/12 01:32 PM Edit   Reply   Quote Quick Reply   thanks for your input, its kind of what i thought. think ill just stay with what ive got. i would love to have a 11" but the weight would be too much for my 145 lb 70 year old body. im pretty healthy at my age and would like to stay that way. thanks again, don Post Extras:       GeneT Ely Kid Reged: 11/07/08 Loc: South Texas Re: question about celestrons 8" verus 9.25" [Re: donnie3]       #5370502 - 08/15/12 06:06 PM Edit   Reply   Quote Quick Reply   If I had to make your decision, I would keep the 8 and buy an 11. The 8 would be a grab and go, with the 11 giving you a real bump up--almost twice the light gathering over the 8. Post Extras:       mdowns Pooh-Bah Reged: 06/12/10 Loc: Englewood,FL Re: question about celestrons 8" verus 9.25" [Re: GeneT]       #5370532 - 08/15/12 06:25 PM Edit   Reply   Quote Quick Reply   I'd keep the 8 as well and possibly consider a 10" dob(orion,astro tech,etc) as my other scope. Still breaks down to two manageable components and offers a signifigant jump in light gathering power. If cost are not prohibited,then a larger truss assembly could be had that is still manageable in terms of component weights.Use the c8 on the moon and planets and the dob on deep sky. Post Extras:       mistyridge Carpal Tunnel Reged: 10/28/05 Loc: Loomis, CA Re: question about celestrons 8" verus 9.25" [Re: donnie3]       #5370555 - 08/15/12 06:54 PM Edit   Reply   Quote Quick Reply   I recntly sold a C11 for the same reason you do not want one...way to heavy. It got painful to lift with my 70+ year old arthritic shoulder. Post Extras:       elwaine Pooh-Bah Reged: 06/18/06 Loc: S.W. Florida Re: question about celestrons 8" verus 9.25" [Re: mistyridge]       #5370623 - 08/15/12 07:48 PM Edit   Reply   Quote Quick Reply   This topic was recently discussed and you can find a lot of information (or opinions) HERE. As I noted in the previous thread, there is a 34% increase in the light gathering performance between a 9.25" and an 8" aperture. When one combines the 34% increase in light gathering with a 16% increase in resolving power, it does not take a trained observer to see the performance increase between a 9.25" aperture and an 8" aperture. There is a definite, easily detectable, difference in the views (at equal magnification) between the two scopes. Is the difference significant? That is a personal matter and only you can decide that for yourself. On the refractor forum, we will extoll the virtues of a 16% increase in light gathering ability and an 8% increase in resolving power (e.g., a 140mm vs a 130mm refractor) but in the Cats and Casses forum, a 34% increase in light gathering and a 16% increase in resolving power is scoffed at as being hardly worth while. Is the difference in visual performance between an 8" SCT and a 9.25" SCT dramatic? No. Is it worth the extra cost? For me it was. For you it may not be. No one on this forum can make that judgement for you. You should also keep in mind that the extra 7 lbs. of a C11 can become substantial late at night, when you are tired and have to take down the scope. The C11 also has a longer cool down time. In addition, you may need a larger mount for a C11 than you will for a C9.25. All of the above should be considered before making a purchase. For me, the bottom line is this: if you can comfortably handle the extra weight, or you have a permanent mounting, and you can plan for the longer cool down time, get a C11. It will show you significantly more than a C8. But if weight, or cost, or cool down time is a factor, get a C9.25... and make it an Edge HD model. There is absolutley no question that the C9.25 will out perform a C8. Is the difference significant? For me it was (and I had a C8 before getting a C9.25). But only you can say if the difference is significant for you. Why did I go for a C9.25 and not a C11? Because in my case, weight was more important than the 40% performance boost between a 9.25" and an 11" aperture. Regards, Post Extras:       Geo. Carpal Tunnel Reged: 10/01/08 Loc: Upstate NY Re: question about celestrons 8" verus 9.25" [Re: elwaine]       #5378106 - 08/20/12 06:04 PM Edit   Reply   Quote Quick Reply   Your "old" Meade LX10 2080 has enhanced multi-coatings A new C8 - 9.25 wil have Starbright XLT. It is difficult to see any real difference in these coatings unless you are doing AP. I'd spend the money on some great eyepieces and may consider a nice goto GEM mount. OTOH, I find a use the 9.25 more than the heavier C11. Post Extras:       Nadrek member Reged: 03/20/07 Re: question about celestrons 8" verus 9.25" [Re: Geo.]       #5378404 - 08/20/12 09:23 PM Edit   Reply   Quote Quick Reply   I bought the C9.25 EdgeHD because it comes with a 2" back from the factory, and secondarily for the better AP characteristics. I will say that for the EdgeHD, the price jump to 9.25 is considerable. Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 18 registered and 16 anonymous users are browsing this forum. 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