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What are those cameras called?

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#1 gnowellsct

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Posted 09 December 2021 - 08:16 AM

There is a camera plus software that is used specifically to evaluate strehl ratio. They were fairly popular a few years ago but I see no mention of them anymore. What is the name? Are they still sold?

I'm forgetting whether this is a hardware plus software system or whether you're just supposed to buy your own webcam and hook it up to some kind of software.

Thanks for any help, Greg N

#2 Exnihilo

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Posted 09 December 2021 - 08:34 AM

Well, I did a google search and came up with this "tool" from Keck observatory.

 

https://www2.keck.ha...rehl_meter2.htm

 

There's a link in there to download a strehl "widget" for a generic strehl estimate, but I didn't install it, so I don't know what kind of inputs it requires.  It says it requires a "science" camera, so I don't know what that means.

 

Scroll down to where it says, "Strehl meter for arbitrary telescopes/cameras," the widget download link is under that.  You get a installable file; I didn't check if that's only usable on unix machines or not, but it may be.


Edited by Exnihilo, 09 December 2021 - 08:36 AM.


#3 gnowellsct

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Posted 09 December 2021 - 08:52 AM

Well, I did a google search and came up with this "tool" from Keck observatory.

https://www2.keck.ha...rehl_meter2.htm

There's a link in there to download a strehl "widget" for a generic strehl estimate, but I didn't install it, so I don't know what kind of inputs it requires. It says it requires a "science" camera, so I don't know what that means.

Scroll down to where it says, "Strehl meter for arbitrary telescopes/cameras," the widget download link is under that. You get a installable file; I didn't check if that's only usable on unix machines or not, but it may be.


That's a very interesting and unexpected answer. But I am referring to a system that was definitely targeted at amateur astronomers. I think it might even have been free and required you to buy your own webcam.

#4 gcardona

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Posted 09 December 2021 - 12:41 PM

Check out WinRoddier. It is a program that analyzes an out of focus star image taken with any camera and computes the Strehl ratio and wave-front errors. The site is in French, so you'll need Google Translate active unless you know French.


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#5 gnowellsct

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Posted 09 December 2021 - 08:30 PM

Check out WinRoddier. It is a program that analyzes an out of focus star image taken with any camera and computes the Strehl ratio and wave-front errors. The site is in French, so you'll need Google Translate active unless you know French.

This is it!  The Roddier test.  Thank you.  A lot of people were using this, I don't know if they know French.  I actually do,however.

 

Greg N




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