Hyperstar 3 Delivered ***Added Pictures***

[h0ughy (David)]

Originally Posted by kruska

Yes, I saw the specs, but...
I calculated the C6 aperture dimensions with the camera and area with appropriate ccd camera(area in square cm)


Aperture Values in C6 are less than the C8 with DSLR.

My question is rather should I get:
1. C11 +hyperstar3-C11 or
2. Hyperstar3-C8 + CCD camera or
3. Hyperstar3-C8

heheheee?
price seems to be different

whatever you can afford but obviously the C11 would be better

[terrynz (Terence)]

Originally Posted by multiweb

In the new celestron HD range I believe the primary and secondary are still spherical so there is an ideal spacing which is the same as a stock SCT. The corrector lenses inside the baffle tube give a flat field. I'm pretty sure the hyperstar is the same unless it has changed again. I was told it was at the time by starizona. The Meade ACF secondary is not spherical to correct for abberations.

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

[pmrid (Peter)]

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

[terrynz (Terence)]

I wasn't comparing the difference between the HD and standard C14 @ F2, just correcting a misunderstanding in the astronomical community regarding the design of the EdgeHD. As a beta tester for Celestron, i'm more than aware of differences. Also the C14 EdgeHD14 do not work at F2. it is F1.9 to be correct.

With compliments...