Hyperstar

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Hyperstar

Postby cottond » Mon Sep 14, 2015 9:49 am

Hello.
Has anyone had any experience using a hyperstar lens on a Schmidt Cassegrain telescope? Are they difficult to use, are the results good? Any information would be gratefully received.
Thanks
Dave
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Re: Hyperstar

Postby dave.b » Wed Sep 16, 2015 11:13 pm

I've not got one but I have looked into it since I have a fastar capable SCT. The accessory is costly, circa £800, and is specific to the type of SCT that you fit it to. Definitely, not sensible on an 8" tube unless you have a barrel CCD to use with it. Even then the optics are apparently not ideal which is why the next size up is 9.25". Judging by how the price of the hyperstar increases for the 11" and then again for the 14" tubes I guess that it probably delivers a better result. For that sort of money you could buy a completely different imaging solution that is far less bespoke though.

Dave B.
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Re: Hyperstar

Postby Gfamily2 » Sat Sep 19, 2015 11:43 am

Someone on the Telescopes Forum has one fitted to a 14" SCT. They've posted this image of M33, which looks OK I suppose, but from a £10,000 telescope I'd expect something OK.
http://www.astronomyforum.net/attachments/astrophotography-forum/117052d1442445032-m33-hyperstar-m33-hyperstar.jpg
50x 300 seconds exposure

There's a lot of light spread from the brighter stars that I'd not be happy with - but maybe that's just me.
Scopes: Meade 8" SCT, Skywatcher 127mm Mak, Raffle winner of SW ST80
For imaging: Pentax K5, Asda webcam, Star Adventurer (new toy)
For companionship: Mid Cheshire Astronomical Group.
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Re: Hyperstar

Postby dave.b » Sat Sep 19, 2015 9:52 pm

Can you upload the picture here? The link you gave is to a members only site.
Even so, unless you already have the F10 SCT and want to convert it into an astrograph, you'd be better off buying a proper astrograph or a better mount and guider for longer exposure time with a smaller 'scope.

Dave B.
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Re: Hyperstar

Postby Gfamily2 » Sat Sep 19, 2015 11:06 pm

Let's see how this works
Image
Scopes: Meade 8" SCT, Skywatcher 127mm Mak, Raffle winner of SW ST80
For imaging: Pentax K5, Asda webcam, Star Adventurer (new toy)
For companionship: Mid Cheshire Astronomical Group.
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Re: Hyperstar

Postby dave.b » Tue Sep 22, 2015 10:34 pm

I see what you mean regarding the halos. Might be some sort of diffraction pattern as there are some brighter radiant lines inside the halos. Did they say what camera was used with the Hyperstar?
Otherwise the picture looks impressive, although image post processing can work wonders these days. But as you say, for a 10 grand 'scope you'd expect at least this standard!

Dave B.
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Re: Hyperstar

Postby Gfamily2 » Wed Sep 23, 2015 1:31 pm

dave.b wrote: Did they say what camera was used with the Hyperstar?

The sig under his post suggests it's a QHY10.
Scopes: Meade 8" SCT, Skywatcher 127mm Mak, Raffle winner of SW ST80
For imaging: Pentax K5, Asda webcam, Star Adventurer (new toy)
For companionship: Mid Cheshire Astronomical Group.
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Re: Hyperstar

Postby dave.b » Wed Sep 23, 2015 10:30 pm

Well that's a nice barrel shaped camera to use with a Hyperstar! There should be just the lead crossing the field of view and that shouldn't affect the image.
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