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Imaging with a Celestron 9.25 XLT and Hyperstar as well as Prime focus

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#1 Maxedout


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Posted 25 April 2019 - 01:04 PM

Longtime lurker seldom poster here.

My question is this.

Will I get the same vibrancy and color on my C9.25 XLT with Hyperstar as I do on the 9.25 Edge HD with my ZWO 1600mmc pro?

Bear in mind I am not talking about flatness of field here.

Just quality of picture after processing.

Hoping to keep this simple with a yes or no if possible.

Edited by Maxedout, 25 April 2019 - 01:06 PM.

#2 stargzr66207


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Posted 25 April 2019 - 03:13 PM

That's hard to say, but based on my own experiences over the past 6 or
7 years, I would say that the "vibrancy and color" in your images should be
as good. I assume that by "vibrancy and color" you mean the saturation
and intensity of the color shown.
It's been my experience that the more sub exposures taken definitely pay
off in regards to the amount of color shown in the resulting integrated
The advantage of HyperStar is that you can take a lot more subs during an
imaging session because of the reduction in exposure time needed by taking
at f/2 as opposed to f/5 or f/6.3 with a focal reducer (see "The Amazing
HyperStar" article in Cloudy Nights articles to learn more). Based on my
experiance with HyperStar, I think you will be very pleased. The only
thing that is tricky with HyperStar is getting and maintaining precise
focus, since the steepness of the f/2 light cone makes the area of perfect
focus very very narrow. I use a Bahtinov mask for focusing rather than
an autofocus program, and always refocus on a nearby star after slewing to
a new object when imaging.
Hope the above has answered some of your questions. Good luck!

Ron Abbott

#3 gcardona


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Posted 25 April 2019 - 04:19 PM

I don't see any difference in my images between Hyperstar and native FL on my Edge C9.25 as far as vibrancy of color. Of course the final vibrancy in the image is going to be determined by processing, and in my experience whether shooting at f/2 or f/10 hasn't made a difference. I use a QHY12 OSC CCD camera.

#4 jerahian



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Posted 25 April 2019 - 07:43 PM




#5 Terry R

Terry R

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Posted 26 April 2019 - 06:02 PM

A detector does what a detector does.  Collects photons and kicks out a result. 


Your question: "Will I get the same vibrancy and color"


Well, that happens during your processing.  You really don't need much colour data to get deep colour, it's really in how you process the data that determines the final result.  

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