Can i use my EDGEHD800 for Ha?

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Taipan
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Can i use my EDGEHD800 for Ha?

Post by Taipan » Wed Apr 25, 2018 5:58 pm

Just curious. Is there a way to fit a etalon and blockfilter to my Celestron EdgeHD800 SCT?
I use a Lunt LS50 for full disks but sometimes i want to get a closeup of a prom. Would be cool if i could use my bigger scope for that...
/Mattias
Lunt LS50THa/B600PT SS. ZWO ASI 120MM-S. Skywatcher Esprit 80ED with homemade Baader solarfilm filter and solarcontinuum filter.

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Re: Can i use my EDGEHD800 for Ha?

Post by marktownley » Wed Apr 25, 2018 7:52 pm

Yes, you just need a suitable ERF. I use mine

Imageimage by Mark Townley, on Flickr

Airylab HaT...
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: Can i use my EDGEHD800 for Ha?

Post by Taipan » Wed Apr 25, 2018 8:52 pm

ERF?
Lunt LS50THa/B600PT SS. ZWO ASI 120MM-S. Skywatcher Esprit 80ED with homemade Baader solarfilm filter and solarcontinuum filter.

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Re: Can i use my EDGEHD800 for Ha?

Post by bart1805 » Wed Apr 25, 2018 9:05 pm

Mark uses a special Edge HD: https://airylab.com/hat-solar-telescopes/
You need this erf: https://www.baader-planetarium.com/en/s ... 80mm).html
Or ask Valery on this forum.

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Re: Can i use my EDGEHD800 for Ha?

Post by christian viladrich » Thu Apr 26, 2018 10:03 am

The answer is a big yes:-)

Here is an exemple of image taken in Ha with my C8 Edge-HD:
Image
Image

See slide 24 for a picture of the scope :
http://astrosurf.com/viladrich/astro/in ... eil-HR.pdf
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Re: Can i use my EDGEHD800 for Ha?

Post by marktownley » Thu Apr 26, 2018 11:07 am

Interesting PDF!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: Can i use my EDGEHD800 for Ha?

Post by Valery » Thu Apr 26, 2018 6:21 pm

Taipan wrote:
Wed Apr 25, 2018 8:52 pm
ERF?
We can make for you a 214mm DERF filter which will allow you to use your C8 telescope as a regular telescope for night observing. Just put it in the front of the telescope and observe the Sun. Remove it and then observe what ever you like. And this will be the most cost effective solution.

Valery
Last edited by Valery on Thu Jun 28, 2018 6:58 am, edited 1 time in total.
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Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

AndiesHandyHandies
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Re: Can i use my EDGEHD800 for Ha?

Post by AndiesHandyHandies » Mon Apr 30, 2018 8:47 pm

Hi

Does the Cassegrain affect the acceptance angle? And how do you calculate the effect? Primary F2 say and secondary magnification F5 to give net F10.
Do you use a standard telecentric barlow to reach F30 or a special one to correct the acceptance angle reduction?

Can you use a PST directly on the focusser? Solving the 200mm backfocus issue by moving the secondary in say.
Or again would you need to correct the accepance angle reduction?

Andrew.

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Re: Can i use my EDGEHD800 for Ha?

Post by christian viladrich » Wed Jun 27, 2018 8:41 pm

The secondary mirror has no effect at all. It is compatible with F/10 collimating lens (= PST) or mica-spaced etalons.
For mica-spaced étalon, you need a F/30 telecentric. AiryLab telecentric are designed for SC.
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Re: Can i use my EDGEHD800 for Ha?

Post by Merlin66 » Thu Jun 28, 2018 12:53 am

Re PST mod with an Edge SCT....I'm not sure the built in corrector and the available back focus would allow you to achieve the necessary -200mm . The mod would there entail more work and cost besides the upfront ERF!
There may be members with practical experience ........
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https://groups.yahoo.com/neo/groups/ast ... scopy/info
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Re: Can i use my EDGEHD800 for Ha?

Post by AndiesHandyHandies » Sun Jul 01, 2018 5:47 pm

Hi

Mark posted a tip for not cutting a refractor to reach focus, of moving the PST collimator lens, or equivalent for telescope F No, from the PST up the focuser tube.

I decided to try a Vixen VMC110L to go with a 110mm Lunt EFR and a PST for a mod. Moving the 20mm Collimator lens into the front of the existing focus T2 base enabled me to reach focus. I did that straight away before any testing.

I eventually moved it further up via a sacrificed Barlow to just behind the primary baffle tube to get F10, stopping the F9.4 telescope down a bit. Now I can use a spare 1.25" barrel to add a futher aperture stop behind the 5mm blocking filter which removes off-axis light coming out of the PST for my 25mm Clave'. Currently two spare Clave' barrels without filter threads, after Clave' via Beacon Hill kindly provided free replacements with filter threads, black taped together. An in development bodge.

Andrew.

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