Hardware question

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ffellah
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Hardware question

Post by ffellah »

Hello all (and Mark T): I am trying to figure out how to fit the Airylab telecentric to the AR152 refractor. Any suggestions on how to do it ?

Thank you,

Franco
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Re: Hardware question

Post by marktownley »

Hiya Franco.

You need a 2" to SCT adapter, something like this at the front of the telecentric https://www.firstlightoptics.com/adapte ... hread.html

Then an EP holder (or screw thread connection if you prefer) at the rear of it for the filter \ camera to go into https://www.firstlightoptics.com/adapte ... -back.html

Mark


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Re: Hardware question

Post by Bob Yoesle »

Hi Franco,

I'm a little curious as to why you are doing this?

You likely won't be getting a truly telecentric output from a telecentric lens system designed/optimized for a Celestron Edge with a 2000 mm EFL @ f10, and which results in an EFR of only f17.5, for a Solar Spectrum filter system that needs at least f30 or greater to get close to the specified FWHM.

A Baader TZ4 (which would likely be a better choice with regard to actual telecentricity) would get you to f26 - not ideal, but better than f17.5.


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Re: Hardware question

Post by ffellah »

Thank you very much Mark for your advice and thank you Bob for your comments. Mark is helping me put together a high resolution Quark CaH system. I quote Mark T's advice:

Your next one to try when conditions allow, stop the scope down to f10, and then run the Airylab 2.7x telecentric behind the scope and ahead of the Quark, this will give you a high res CAK system then. The 152 will still be Ok-ish at f10 in CaK. I think you will be pleasantly surprised with the results, the Airylab is optically excellent deep in the blue...

Bob: I am very interested to try this, when I get the adapter and the conditions allow. I forgot to tell you that I already have the Airylab telecentric, like Mark T, that came standard with the HaT 203mm scope we both have.

Franco


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Re: Hardware question

Post by marktownley »

Hi Bob and Franco.

Stopping the 152 down to (90mm?) give it a f10 light cone into the Airylab telecentric will work very well in the blue. I just use the camera that works with the seeing then, 174 chip if seeing is poor, 290 chip if the seeing is good. Stopping down also reduces SA with the large aperture of the 152.

On the snout of the airtylab I also have a series of extension rings that allow a tube to sit higher up the focuser, then I have my uv/ir filter for an ERF. My filter sits on the eyepiece side of the airylab. You can find pictures on my website https://brierleyhillsolar.blogspot.com/ ... irylab+cak

Give it a go! :)

Mark


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Re: Hardware question

Post by Bob Yoesle »

Duplicate post to below.
Last edited by Bob Yoesle on Thu Dec 30, 2021 5:57 pm, edited 2 times in total.


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Re: Hardware question

Post by Bob Yoesle »

Now it all makes sense!

Thanks for the clarifications, and the results look spectacular Mark! ;-)

Looking forward to putting together a 3.2 mm re-spaced CaK-optimized C6R 150 mm f/8 stopped down to 120 mm for f/10 for my CaK higher res work. I'll just have to see if my local seeing allows this to be practical. I don't have the AiryLab telecentric, but I do have the Baader TZ3 which is supposed to be suitable for CaK as well.

Right now (and for a few more months) it's a moot issue...


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