"New" PST comes with a 30mm etalon??

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Merlin66
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"New" PST comes with a 30mm etalon??

Post by Merlin66 » Sat Feb 01, 2020 12:13 am

Just saw this Ad:
""
The Coronado PST h-alpha telescope comes with a 40mm f/10 Ha optical system and an internal 30mm etalon primary blocking filter. A patented tuning system allows for fine adjustment of the bandpass for the best detail, and a built-in focuser allows you to achieve the sharpest image.
""
Is this correct????
All the PST's I've dismantled for mods have all had an effective 20mm etalon.
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Re: "New" PST comes with a 30mm etalon??

Post by MalVeauX » Sat Feb 01, 2020 1:20 am

Has to be a typo...

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Re: "New" PST comes with a 30mm etalon??

Post by Merlin66 » Sat Feb 01, 2020 1:26 am

Hmmm
Unfortunately being copied into Ads and commercial websites around the world......
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Re: "New" PST comes with a 30mm etalon??

Post by marktownley » Sat Feb 01, 2020 9:55 am

Got to be a typo...
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Re: "New" PST comes with a 30mm etalon??

Post by Rusted » Sat Feb 01, 2020 1:32 pm

Beat the rush! Get yours now! ;)
http://fullerscopes.blogspot.dk/

Baader 160mm D-ERF, iStar 150/10 H-alpha, Baader 35nm H-a, Beloptik KG3, PST etalon, Lunt B1200S2, ZWO ASI174.

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Re: "New" PST comes with a 30mm etalon??

Post by nebulabru » Sat Feb 01, 2020 2:58 pm

Hello,
A question,
Have the current PST Coronado solved the rush problem?
Thanks,
Nebu.

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Re: "New" PST comes with a 30mm etalon??

Post by marktownley » Sun Feb 02, 2020 6:24 am

nebulabru wrote:
Sat Feb 01, 2020 2:58 pm
Have the current PST Coronado solved the rush problem?
Simple answer no. It's quite easily solvable, would just mean a hard coated blocker, which would mean the cost (and then sale price) would be higher.
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Re: "New" PST comes with a 30mm etalon??

Post by Bob Yoesle » Sun Feb 02, 2020 6:29 am

Hi Ken,

I suspect Meade is stating the physical diameter to the entire etalon plates, not the effective diameter of the reflective coated portion of the etalon itself.
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Re: "New" PST comes with a 30mm etalon??

Post by marktownley » Sun Feb 02, 2020 6:38 am

Bob Yoesle wrote:
Sun Feb 02, 2020 6:29 am
Hi Ken,

I suspect Meade is stating the physical diameter to the entire etalon plates, not the effective diameter of the reflective coated portion of the etalon itself.
A bit like their SM70 actually only being 60mm :lol: :lol: :lol:
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Re: "New" PST comes with a 30mm etalon??

Post by Merlin66 » Sun Feb 02, 2020 6:46 am

If so, it’s absolutely rubbish!
What a con job....
I have an 80mm Solar ED80.....but fitted with a 60mm etalon!!!
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Re: "New" PST comes with a 30mm etalon??

Post by marktownley » Sun Feb 02, 2020 7:43 am

Merlin66 wrote:
Sun Feb 02, 2020 6:46 am
If so, it’s absolutely rubbish!
What a con job....
I have an 80mm Solar ED80.....but fitted with a 60mm etalon!!!
Tee hee hee! I agree! :D

I have a great marketing idea for Meade / Coronado - they should sell their SM90 etalons on a 100mm frac, then they could rebrand them SM100's :lol: :lol: :lol:

Maybe this is just the norm in the industry? After all Daystar solar scout scopes http://www.daystarfilters.com/Scout/60ScoutDS.shtml are touted as double stack bandpass despite only using one etalon.

A lot of marketing guff me thinks!! :roll:
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Re: "New" PST comes with a 30mm etalon??

Post by PDB » Sun Feb 02, 2020 8:34 am

Probably they were inspired by how other filters are measured ....
A 1-1/4" thread-in filter is also measured by the outher casing leaving only ~26mm clear aperture. (~1") (But here that is more an indictaion where the thing will fit in)
But still guesswork; one (not me) should probably buy one and dismantle it (althoug that is probably prohibited by Meade as well)

Paul

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Re: "New" PST comes with a 30mm etalon??

Post by Merlin66 » Sun Feb 02, 2020 9:54 am

Paul.
Yes, Meade specifically say the etalon is "fixed" for safety and NOT ACCESSIBLE .... "no user replaceable parts herein"
Hmm what about "inspecting" ITF filters for failures????
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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