PST vs. Lunt50 mod - which and why?

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GaborKiss
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PST vs. Lunt50 mod - which and why?

Post by GaborKiss » Wed May 25, 2016 3:20 pm

Dear Forumers,

I would like to ask your opinion and older links (found some, but maybe you know better) about PST and Lunt50 mods.

I see most of you are using PST mods. I would like to know if price doesn't matter (as I might have the chance for a decent price Lunt50 filter), which one is the way to go, what are the advantages and disadvantages?

I would make a scope which is about 120-150mm aperture, not sure about it yet.

Thank you
Gabor
Currently out of equipment, but still around to see your images! :)

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Merlin66
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Re: PST vs. Lunt50 mod - which and why?

Post by Merlin66 » Wed May 25, 2016 4:51 pm

The PST mod is optimized for an f10 donor....
I think the internal Lunt 50 etalon is working at f7.
For a stage 1 mod I'd think both would perform well.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

GaborKiss
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Re: PST vs. Lunt50 mod - which and why?

Post by GaborKiss » Wed May 25, 2016 4:56 pm

Thanks for the reply. What does "stage 1 mod" means?
Currently out of equipment, but still around to see your images! :)

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Re: PST vs. Lunt50 mod - which and why?

Post by Merlin66 » Wed May 25, 2016 5:38 pm

The stage 1 mod is where the original etalon housings and blocking filters are reused.
Basically you replace the original objective with a suitable donor OTA plus an ERF.
The stage 2 mod is where the etalon is removed from the original solar scope and used on a suitable donor OTA/ ERF with a larger blocking filter.
I have a write-up available on the PST mods, just drop me an email for a copy.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

GaborKiss
Im an EXPERT!
Im an EXPERT!
Posts: 367
Joined: Fri Apr 13, 2012 11:05 am

Re: PST vs. Lunt50 mod - which and why?

Post by GaborKiss » Thu May 26, 2016 10:37 pm

Very interesting mod, my friend made a similar one, but he let the front lens in front I guess. I send him your thread!
Currently out of equipment, but still around to see your images! :)

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