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Doug
17-12-2006, 09:01 PM
I found this link interesting and want to share it with all. Those having SCTs of various sizes including some Meade SCTs can now reduce their effective F/ratios to f2. At present not all sizes are catered for however this might change down the track a bit. There are some very impressive images taken with the HyperStar, and elsewhere I have seen some good images acquired with a digital rebel, instead of an sxv or what have you..
The link is : http://starizona.com/acb/hyperstar/index.aspx

The image below is from a 11" nexstar GPS, 10x30sec Altaz mounted with an sxv-h9c

cheers,
Doug
ving
17-12-2006, 09:11 PM
f2! cool :) that'd give a nice FOV :)
stephenmcnelley
17-12-2006, 10:21 PM
Sounds tempting, that image is a virtual candy shop...... there is a catch or five for sure.
ballaratdragons
17-12-2006, 10:32 PM
wouldn't the CCD camera cable run across the FOV?
stephenmcnelley
17-12-2006, 11:22 PM
Not to mention, people, wildlife and other traffic lol.

Seriously its not that bad for FOV though..
Doug
18-12-2006, 01:05 AM
Ken, Celestron have had this system for years, they called it 'faststar'.
the cables running across the corrector plate should only produce a diffraction spike I guess, never used the system so I can't speak from experience.

cheers,
Doug
CometGuy
18-12-2006, 07:50 PM
The interesting thing is - unlike the farstar - you can get good FOV. The 14" version will fully cover a DSLR, but I don't know what the star images would be like on a fullsize image (the samples I have seen a too small to tell).

Terry
Doug
18-12-2006, 09:18 PM
Hi Terry, Take a gander at http://www.metropolitanskies.com/Neb61.html

I'd say his focus is out a tad, and 35 seconds was too long :eyepop:
maybe 30+ x 25 or 30 seconds might help tame the lens flare.
This was one of this guys first light images with the hyperstar so judge it with that in mind.
Cheers,
Doug
CometGuy
18-12-2006, 09:34 PM
These are the images I have seen, but they are downsized at least 3x. Still pretty promising, 700mm focal length with 14" of aperture behind it is pretty awesome! Definitely a firehazard for anyone attempting long exposures :lol:

I could find any specs for it, eg spot sizes, vignetting, etc. Have you seen anything?

Terry
Doug
19-12-2006, 10:03 AM
No, I've shared all info I have on it to date.
cheers,
Doug