Orion XT8 Dobsonian
Meade ETX-90EC Maksutov-Cassegrain
Unitron 128C 60mm Equatorial Refractor
Orion UltraView 10x50 WA Binoculars
Quote:DavidLet me try and explain from a real life example. If I use my 80mm refractor on an object like M27 let's say. I can expose for 30 seconds and with no focal reduction (F7 scope) I am shooting at 600mm and my FOV is 39' x 26' Then I crank up my C11 and with reducers (F3) I can get down to just over 800mm. And my FOV is 28' by 20'. Ok. So what gives? Ignoring the vignetting from the high reduction the C11 can produce that same image in terms of colors and brightness in much less time like 10 seconds. So yes you gain with aperture in terms of speed yet there is a give back. In my extreme light pollution the background in the 80mm is darker and there is more haze from the sharp reduction in the C11. Moreover as I mentioned there isLikely to be vignetting with such extreme reduction. I use my C11 more than my 80mm. But now that I have two video cameras I am planning to use them both at the same time on both scopes to get the best of both worldsHence the solution is easy. Have at least two telescopes, a larger aperture and a smaller one and have at least two video cameras. Easy Al
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LS60THa/B1200 Cerevolo 8" F5 MN Orion 11 SCT Tak EM200, Meade 6" F5 Newt, Starblast 4.5", ETX 90 C6 SCT, Meade 90 mm F9 refractor Meade 10"SN Canon T3, Mallincam Extreme
Quote:David to be honest I really do not think that an 11 to 14" scope is a large aperture scope. I would say it is decent size aperture but not large. Now when were talking about a 16 + inch scope now that is large, but my feelings have not change from what I previously wrote.My reason from moving up from the C9.25" to the VRC10" scope was not for the extra little aperture. ** It was for the corrected flat field that was required for my MC Universe and for the high quality optics. I also use an 80 mm f/6.2 TMB triplet refractor for the wide field objects and also high quality Canon lenses for the extreme wide field objects.Where are the broadcasters on NSN using the "big reflectors"?? There are a lot more objects that are a fair size then just M45 & M31. When it comes to *video or imaging* how do you increase photon capture with aperture, please explain this? An equal focal ratio of both scopes will collect the same amount of light within the same time frame. The reason why globular clusters look nicer in a larger aperture scope when it comes down to video or imaging is because of the resolving power and that is it.Chris AAstrogate
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CPC 1100 with HD Pro Wedge with ETX-70 Finder Celestar C8, C80ED and PST Istar 150 Anistigmatic R30 on CGEM Jason 313 from 1975! Mallincam Extreme & Mallincam SSIc & Mallincam Micro DSI Pro, Orion SSAG, GPUSB, Nautilus Filterwheel JMI, Celestron and Orion MotoFocus, FCUSB1&2 Hyperion 5,13, ES 18, 30, OR 18, 25 TV 2.5x Powermate, WO Binoviewer with pairs: TV 7 Naglers, WO 20 and RKE 28
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