Quote:
Originally Posted by terrynz
Hi Mark,
You need a spacer for the standard Hyperstar 3 to work with the EdgeHD or you need to purchase the newer EdgeHD Hyperstar assembly. Yes the mirrors are the same design from the old Celestron SCT and EdgeHD, there are slight differences between the two, including, but not limited to the rear cell housing the mirror. This results in the hyperstar needing to be set a little further forward (away from the corrector) to reach focus.
Here is the link to the adaptor. http://starizona.com/acb/HyperStar-E...P3112C773.aspx the newer Hyperstar come in 2 versions. EdgeHD and standard SCT.
As for the Meade ACF - you are correct. However it only corrects for coma and is not a true astrograph; and this is where the the EdgeHD is different. This became evident during beta testing and to us optical designers.
cheers
Terry |
As I understand it, the Edge HD achieves the difference by means of the additional optical elements positioned in the baffle tube. Those would not have any impact on the use of a HyperStar of course - not being in the optical pathway at all in that configuration. So the difference between the EdgeHDs and, say the C14s seem to largely disappear don't they - when used with HyperStar that is.
Peter