another PST stage 2 mod

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another PST stage 2 mod

Post by pedro »

Check out a few images of the 2 PSTs (H-alpha and CaK) and the parts for another PST Stage 2 mod

Imagepst_pst_CaK_20180813-07 by Pedro Ré, on Flickr

Imagepst_pst_CaK_20180813-01 by Pedro Ré, on Flickr

Imagepst_mod_stage2_20180813-19 by Pedro Ré, on Flickr

Imagepst_mod_stage2_20180813-17 by Pedro Ré, on Flickr

Imagepst_mod_stage2_20180813-14 by Pedro Ré, on Flickr

Imagepst_mod_stage2_20180813-10 by Pedro Ré, on Flickr

Imagepst_mod_stage2_20180813-07 by Pedro Ré, on Flickr

Imagepst_mod_stage2_20180813-02 by Pedro Ré, on Flickr

Imagepst_mod_stage2_20180813-05 by Pedro Ré, on Flickr

Imagepst_CaK_20180813-05 by Pedro Ré, on Flickr

Imagepst_20180813-10 by Pedro Ré, on Flickr


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Re: another PST stage 2 mod

Post by marktownley »

Nice!


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Re: another PST stage 2 mod

Post by pedro »

Thanks Mark


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Re: another PST stage 2 mod

Post by pedro »



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Re: another PST stage 2 mod

Post by bart1805 »

Beautiful telescopes Pedro! Are you going to use the etalon in the f/7 beam? You could maybe try a Baader 1,7 Glasspath. Would give f/11,9.


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Re: another PST stage 2 mod

Post by pedro »

I tried a 1.6X 2" barlow before the PST etalon but I still have to try other adapters


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Re: another PST stage 2 mod

Post by pedro »

I also bought a Baader 1.25X Glasspath (it's on the way)
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Re: another PST stage 2 mod

Post by pedro »

I'm still waiting for the Baader glasspath, I will keep you posted


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Re: another PST stage 2 mod

Post by bart1805 »

The Glasspath works perfectly. Got the idea from banjo on this forum and use it myself in a 150mm f/8 Skywatcher. Mounted the Glasspath in the nosepiece.


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Re: another PST stage 2 mod

Post by pedro »

Thanks Bart


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Re: another PST stage 2 mod

Post by Carbon60 »

Looking forward to seeing images from this mod, Pedro.

Stu.


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Re: another PST stage 2 mod

Post by pedro »

Thanks Stu

It works but it will be better after I install the Baader 1.25X glasspath, I will you keep you guys posted


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Re: another PST stage 2 mod

Post by pedro »

I finally have all the pieces for my PST Satge 2 MOD. I received the Baader 1.25X Glasspath Corrector yesterday. I plan to use it maily with two telescopes> TMB100 F/8 and TEC140 F/7. Check out some images from my FLICKR page

ImagePST_STAGE_2_MOD_20180828-27 by Pedro Ré, on Flickr
BAADER 110mm ERF + Teflon Adapter + PST etalon and adapter

ImagePST_STAGE_2_MOD_20180828-13 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-12 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-10 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-07 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-05 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-03 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-17 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-19 by Pedro Ré, on Flickr

ImagePST_STAGE_2_MOD_20180828-21 by Pedro Ré, on Flickr


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Re: another PST stage 2 mod

Post by bart1805 »

Nice! And now waiting for the first pictures. (-;
How did you mount the glasspath on the front lens? Ans I am curious if the distance between the back of the etalon and the focal point is about 20 cm, looks shorter. Or did you change the lens?


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Re: another PST stage 2 mod

Post by pedro »

Thanks Bart

It's cloudy here but it will improve in a couple of days. I had to use a plastic spacer to fit the glasspath in front of the etalon. I cannot use a long distance after the PST etalon, otherwise I will not get my camera in focus. I will give it a go and let you know.


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Re: another PST stage 2 mod

Post by bart1805 »

Interesting, I thought it was not possible so had it mounted in the nosepiece. But you still have the original front lens before the etalon?
Maybe the fact that you could not reach focus had something to do with the backfocus of the scope and the fact that you worked in a f/8 beam.


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Re: another PST stage 2 mod

Post by pedro »

I did not try yet the mod with the Baader Glasspath in front of the etalon. I could reach focus without it

Where exactly did you mount the glasspath? Inside the nosepiece?

Mine is close to the etalon also inside the nosepiece


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Re: another PST stage 2 mod

Post by bart1805 »

Hi Pedro,
Yes inside the nosepiece. I got the idea from banjo, in this thread there is also a drawing of his nosepiece. viewtopic.php?f=4&t=23610&p=212934&hili ... th#p212934
AOK made a nosepiece for me and mounted the glass path.
CS Bart.


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Re: another PST stage 2 mod

Post by pedro »

Thanks for the link Bart

Mine is almost like that. It is not too close to the PST etalon


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Re: another PST stage 2 mod

Post by pedro »

Tried the PST Stage 2 Mod today for the first time (TMB100 F/8). Visually it is great. For imaging it is not the same thing, big soft spot

Check out some images below.

More in a different thread
Attachments
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solar_imaging_session_20180829-02.jpg
solar_imaging_session_20180829-02.jpg (2.16 MiB) Viewed 8406 times
solar_imaging_session_20180829-027.jpg
solar_imaging_session_20180829-027.jpg (800.16 KiB) Viewed 8406 times
solar_imaging_session_20180829-031.jpg
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solar_imaging_session_20180829-036.jpg
solar_imaging_session_20180829-036.jpg (860.06 KiB) Viewed 8406 times
solar_imaging_session_20180829-047.jpg
solar_imaging_session_20180829-047.jpg (500.62 KiB) Viewed 8406 times
solar_imaging_session_20180829-051.jpg
solar_imaging_session_20180829-051.jpg (892.67 KiB) Viewed 8406 times


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Re: another PST stage 2 mod

Post by pedro »

First light (TMB100 F/8 + PST Stage 2 Mod, X2 Barlow @X1.4)

more at: viewtopic.php?f=4&t=25032
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Re: another PST stage 2 mod

Post by pedro »


PST STAGE 2 MOD | Pedro RÉ
TMB100 F/8, Baader 110mm ERF, PST etalon, Coronado BF15
http://re.apaaweb.com


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Re: another PST stage 2 mod

Post by pedro »


PST STAGE 2 MOD | Pedro RE'
TEC140 F/7, Baader 165mm ERF, PST etalon, Coronado BF15
http://re.apaaweb.com


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Re: another PST stage 2 mod

Post by pedro »

More images. Correct spacing (PST etalon, Baader 1.25X Glasspath). TMB100 F/7, Baader 110 ERF, PST Stage 2 Mod


Imagesolar_imaging_session_20180831-044 by Pedro Ré, on Flickr

Imagesolar_imaging_session_20180831-047 by Pedro Ré, on Flickr

Imagesolar_imaging_session_20180831-051 by Pedro Ré, on Flickr

Imagesolar_imaging_session_20180831-054 by Pedro Ré, on Flickr

Imagesolar_imaging_session_20180831-057 by Pedro Ré, on Flickr

Imagesolar_imaging_session_20180831-059 by Pedro Ré, on Flickr

Imagesolar_imaging_session_20180830-03 by Pedro Ré, on Flickr


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Re: another PST stage 2 mod

Post by pedro »

A few more images

Two different PST etalons + Coronados BF15 & BF10 ----> back distance from the etalon - 14/15cm

Imagepst_stage2_mod_20180908-013 by Pedro Ré, on Flickr

Imagepst_stage2_mod_20180908-009 by Pedro Ré, on Flickr

Imagepst_stage2_mod_20180908-005 by Pedro Ré, on Flickr

Imagepst_stage2_mod_20180908-002 by Pedro Ré, on Flickr


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Re: another PST stage 2 mod

Post by bart1805 »

And now it is a small step to doublestack the etalons. (-;


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Re: another PST stage 2 mod

Post by pedro »

Hi Bart

I have a BIG soft spot with both etalons. Very different from my other H-alpha systems


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Re: another PST stage 2 mod

Post by pedro »

PST Mod (PDF file)

http://astrosurf.com/re/PST_Stage_2_Mod ... 180911.pdf
Ré, P. (2018). PST Stage 2 Modification. Pdf file (2000kB)

more articles at:
http://re.apaaweb.com/pdfs_articles.html


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Re: another PST stage 2 mod

Post by Starry Jack »

Pedro,
In your excellent document (http://astrosurf.com/re/PST_Stage_2_Mod ... 180911.pdf), you mention the focus must come to a point 244mm from the rear of the rubber on the etalon. Where is that on your scope? The top of the diagonal? The middle of the eyepiece?


I've cobbled together a prototype yesterday using some pretty strange spare parts but it should work.

The other question is...I am using parts of a standard 2x barlow rather than the Glasspath. I've figured out the mounting in the prototype but does it need to be telecentric?

Thanks,
Jack


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Re: another PST stage 2 mod

Post by pedro »

The measurement was made by Ken Harisson:

Ken Harrison (2005). Modifying a Coronado PST Hα Solar Telescope (PDF file).

The PST etalon must be correctly placed. Final focus should be 225 mm behind the rubber ring of the etalon.

You can use other parts, a X2 barlow should work fine. It needs to be telecentric


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Re: another PST stage 2 mod

Post by Starry Jack »

Thanks, Pedro. I think my only confusion is where "final focus" is. I only use a video camera (no visual). Is that at the exit of the blocking filter? Or is it measured at the sensor chip? Or somewhere in between?

Best,
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Re: another PST stage 2 mod

Post by pedro »

Hi Jack

I tried several configurations and found out that a distance of 14cm from the rear of the PST etalon to the Coronado BF, works fine

Imagesolar_imaging_session_20180830-03 by Pedro Ré, on Flickr

ImagePST_stage_2_mod_20180830-032 by Pedro Ré, on Flickr

I did not reduce the OTA's length (did not cut the tube)

regards


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Re: another PST stage 2 mod

Post by Starry Jack »

Got it. And I also found the document you referred to so I should be good to go. The biggest difficulty seems to be finding an ok n-stock telecentric lens.

Jack


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Re: another PST stage 2 mod

Post by marktownley »

None of the lenses in this system are telecentric Jack - totally different thing!


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Re: another PST stage 2 mod

Post by OlegLviv »

I want returns to PST MOD2 because a few days ago arrived my TS 152/F5.9 and dont know how gets f10 for PST but have two ideas!

1.Buy Baader 1.7x Glasspath and will be have f10
2.I have Televue 2.0 Povermate 2x and can put front etalon but will be have F11.8

Which of the options will be the best????

Or maybe buy Lunt 50 with f7 and put Baader Glasspath 1.25?

What is the bandwidth of Pst and Lunt50? Pst 1A and Lunt 50 0,75A am right?

Thank you!


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Re: another PST stage 2 mod

Post by pupak »

AR150/F6 works well with TV5x PWMT and Quark which is similar to PST. You get F30 and the details are OK.


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Re: another PST stage 2 mod

Post by OlegLviv »

pupak wrote: Sun Nov 20, 2022 7:04 pm AR150/F6 works well with TV5x PWMT and Quark which is similar to PST. You get F30 and the details are OK.
I dont want quark because a few years sold him dont like this device.
If you know pst wants f10 without vingetting and Lunt 50 wants F7.
But now want better choice for my AR150/F6.

If you know had old model Lunt 60T with colimator f4 and its a bad choice for my AR150/F6 mod......
My friend can give me for test PST MOD2 with 2.0 Powernate2x =F11.8 or can buy Baader Glasspath 1.7 lens=F10 but PST etalon has only 1A and think that Lunt 50 with Baader Glasspath 1.7=F7.2 will be better with 0.75A than PST MOD2.

Which of the options will be the best with my TS 152/F5.9 ? (contrast and sweet spot)


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