Takahashi TSA-120 & Explore Scientific 102mm APO Refractors
Lunt 60mm PT Ha
Celestron Edge 800 & Edge 1100 SCT's
Celestron AVX & CGEM Mount's
Televue Ethos 100* 21mm, 17mm, 13mm, 10mm and 6mm & Explore Scientific 82* 4.7mm Canon Rebel T3i DSLR SBIG STF-8300M, FW5-8300, OAG-8300, ST-Ic guide & planetary camera
10" OO VX, 6" iOptron Mak-Cass, Orion 100ED
"Considered as a collector of rare and precious things, the amateur astronomer has a great advantage over amateurs in other fields ... the amateur astronomer has access at all times to the original objects of his study; the masterworks of the heavens belong to him as much as to the great observatories of the world. And there is no privilege like that of being allowed to stand in the presence of the original." --Robert Burnham Jr, Burnham's Celestial Handbook
Quote: "By the way, Carbon fiber is not an advantage in a refractor, in fact it is a disadvantage if you will be imaging with it. As the temperature drops, the focal length of the lens shortens quite noticeably, so a thermally stable tube that does not shorten will exacerbate the defocus problem. Aluminum at least contracts enough to counteract some of the defocus.
-DannyMy warehouseMy Channel
Explore Scientific ED127Explore Scientific AR152Celestron Omni XLT 102 Orion XT10i
Quote:Just got an ES127 recently; .......I have not seen anything on strehl ratios or the like, but hey, let's not forget what it is. It is a good quality, value APO. ....... Arizona Ken
George N Obsession 20 Optical Guidance Systems 10" F/9 R-C Cass 6" F/5 & 8" F/8 home-made Newts Explore Scientific 127mm ED MI-250 mount Denk II bino-viewer, with PowerX and Newt reducer, Member, International Dark-Sky Association
Far out in the uncharted backwaters of the unfashionable end of the Western Spiral Arm
Quote:As a visual user the CF doesn't really matter to me other than weight. The real difference in weight can be if a tube that is 4lb lighter allows you to get by with one less counterweight. I mean if getting the CF tube meant you could get by with one 11lb counterweight instead of two, then that is a weight savings. In this case probably not, at least not unless you got a counterweight shaft extension.
Z 10, AD 12, ES 127 APO Parks Jovian-4
Quote:Good insight Dr Who about the VX mount handling the weight of the CF tube with a single counterweight. I have a 6" shaft extension already (so I can get by with just two weights for my reflector). I wonder if the new aluminum ES 127's are any lighter weight. If I could get one on my CG5 with shaft extension and one counterweight that could be an idea. With two counterweights I feel like I might as well get the reflector out. My wife asked me if I need to get one last scope before the twins arrive and drive us broke...Kind of hate to buy a nice scope to gather dust for a couple years though.
Quote:From the research I've been doing, is seems as if Takahashi have the edge with strehl of .998 and perfect colour correction. But I don't think one would notice the difference in a side by side comparison of TEC's and TAK's similar sized scopes. Please correct me if I am wrong.
Johnny FS152 15" Obsession Classic w/ 14.5" f/4.65 Zambuto
Meade LX200GPS 14", Meade LX200ACF 10" Celestron C8 SCT w/Hyperstar (CGEM Mounted) Explore Scientific AR152, 127mm APO, 102mm APO, 80mm APO AT 6" RC, William Optics GTF 102 Lunt LS60TDS & Cak B1200 QHY10, ATIK 460EX(M), 450C, Starlight Express H18 w/FW and OAG Orion StarShoot Pro V.2, Orion StarShoot SS III, NexImage 5 & PG Chameleon Meade LPI, DSI-C 1, Lodestar & SSAG (autoguiders) Canon XSi Digital Rebel Hap Modded Images Plus 4.0, MaxIM DL Pro 5.14, BackyardEOS
Hypotheses non fingo