Any experience with TS Hyperstar 130mm f 2.8 ? - Forums

Topic starter

Jan 20, 2022

Hi all,

I find this product very interesting, obviously the field is quite wide. Anyone here at astrobin who is using it?
If so, how do you like it and what tools do you use for collimation?

Thank you
Wolfgang

Steven

Jan 20, 2022

Not 100% sure which one you mean. I'm guessing it's the "Hypergraph 130"?..
the small "newtonian-looking" one? (yes I know it isn't one) - I can't find any images of it on Astrobin (or using the wrong search terms)

I did find the 150mm version all images are from "Janos Barabas", perhaps he's the best one to let you know how it is.

I would reckon collimation is tricky at F2.8.
And I had a look at on the website and their video on it. They're saying that a high quality laser wouldn't be enough.. enough to get the first pass ofcourse, but they recommend a "star-test" in this video

Personally I think it's an interesting scope, but at quite a price point.
I was on my radar for a bit, as I was interested in either a C6 of C8 Celestron with a hyperstar conversion. But ended up putting that on hold for now.

kuechlew

Topic starter

Jan 20, 2022

Oops sorry, yes I mean the Hypergraph. I believe it's manufactured by Sharpstar that's why I made "Hyperstar" out of it. Thank you for your contribution.

andrea tasselli

Frequent contributor

Jan 20, 2022

Did a bit of back of the envelope calcs and it appears it is only 10% more in aperture than a 300mm f/2.8 lens. You can get a very decent one for 1/2 less than the cost of that mini-hypergraph, used obviously. Far easier to use and just as tricky to focus. And no issue with collimation either.

kuechlew

Topic starter

Jan 21, 2022

Thank you Andrea, interesting idea to go for an f 2.8 lens. I'm not sure though whether I'll get the same image quality.
What makes the Hypergraph interesting to me is my limited time for capturing images, so using f 2.8 - while certainly challenging - would help me a great deal. Taking an f 2.8 lens and stopping down for better image quality is certainly the best option considering what you get for the price but counterfeits my specific needs.

Respectful

andrea tasselli

Frequent contributor

Jan 21, 2022

Here is a test I did on a Nikon AFS 300mm f/2.8 : https://www.astrobin.com/full/c8onpo/0/

I shoot with the lens fully open otherwise what would be the point of it? So far the results are, let's say, interesting. Obviously how much field aberrations are acceptable depends on a number of factors, most notably the personal taste in the matter. In my experience with this lens is that getting the focus just right its tricky but rather stable once settled at temperature.

kuechlew

Topic starter

Jan 21, 2022

Thank you for the example, indeed quite good for a lens that was not created to shoot starts.

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