Yeah, after some months of development it is done:
My conversion kit for a PST Mod II:
The following components were chosen for the setup:
- Skywatcher Evostar 102/1000, shortened by 80 mm to put the etalon of the PST 200 mm objective in front of the primary focus; the original OAZ was kept
- DERF 90 mm narrow focus filter from Baader-Planetarium
- 3D Printed DERF holder (I was missing the threaded inserts, hence the perfectly improvised tape).
- Adapter 2" to Etalon
- Adapter Etalon to TS-Optics Heli2 OAZ
- Adapter Heli2 to ITF & block filter of PST40
- Adapter rings T2 to get to 55 mm backfocus
The backfocus was defined as 55 mm to be able to use DSLR as well.
Here is the setup on the eyepiece side in detail.

Test 1: How important is the position of the etalon to the primary focus?
The positions of the OAZ 1 are changed at 1 mm intervals. The etalon is not adjusted, otherwise the sweet spot (area of optimal seeing in the image) changes. Using OAZ2, the image is set to scahrf.
Result:
The position of the etalon must be accurate to within 1-2 mm of the intended position, otherwise the sweet spot will be negatively affected.
TODO:
For each modification, the optimal position must be determined and documented.
Test 2: What performance does the setup offer?
Sharpcap and Autostakkert3! are used to create and check recordings.
It's nearly done....
- Bastelhannes
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- Bastelhannes
- Ohhhhhh My!
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Re: It's nearly done....
Ah.. I totally forgot...
The goal is to create an easy and efficient conversion kit...
Production will be started soon...
The goal is to create an easy and efficient conversion kit...
Production will be started soon...
My greatest fear is being married alive.
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Re: It's nearly done....
After a while of being away I really need to sort my pst mod out.. this has certainly recreated that sparkBastelhannes wrote: ↑Sat Mar 26, 2022 3:52 pm Yeah, after some months of development it is done:
My conversion kit for a PST Mod II:
Teleskop_800.jpg
Aufbau_800.jpg
The following components were chosen for the setup:
- Skywatcher Evostar 102/1000, shortened by 80 mm to put the etalon of the PST 200 mm objective in front of the primary focus; the original OAZ was kept
- DERF 90 mm narrow focus filter from Baader-Planetarium
- 3D Printed DERF holder (I was missing the threaded inserts, hence the perfectly improvised tape).
- Adapter 2" to Etalon
- Adapter Etalon to TS-Optics Heli2 OAZ
- Adapter Heli2 to ITF & block filter of PST40
- Adapter rings T2 to get to 55 mm backfocus
The backfocus was defined as 55 mm to be able to use DSLR as well.
Here is the setup on the eyepiece side in detail.

Teleskop_800.jpg
Test 1: How important is the position of the etalon to the primary focus?
The positions of the OAZ 1 are changed at 1 mm intervals. The etalon is not adjusted, otherwise the sweet spot (area of optimal seeing in the image) changes. Using OAZ2, the image is set to scahrf.
Result:
The position of the etalon must be accurate to within 1-2 mm of the intended position, otherwise the sweet spot will be negatively affected.
TODO:
For each modification, the optimal position must be determined and documented.
Test 2: What performance does the setup offer?
Sharpcap and Autostakkert3! are used to create and check recordings.
Surface_800.jpg
- marktownley
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Re: It's nearly done....
Nice setup and shots!
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!
- Bastelhannes
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Re: It's nearly done....
Thank you.
I was always my goal to develop an easy conversion kit for PST40. I still remember hours of research, reading, doubts, questioning until I got the first PST40 Mod 1 running. Afterwards it looks so easy.
But I wanted to reach more, so I developed this kit.
I want to make it possible for everyone to modify her/his (f,m,d,u) PST40.
If there any requests or suggestions, please let me know.
Karl (teesekop-spezialisten.de) is going to offer this kit in a few weeks.
If I ever figure it out how to solve CE and safety issues I would even offer the conversion to people who do not dare to disassemble their PST40...
I was always my goal to develop an easy conversion kit for PST40. I still remember hours of research, reading, doubts, questioning until I got the first PST40 Mod 1 running. Afterwards it looks so easy.
But I wanted to reach more, so I developed this kit.
I want to make it possible for everyone to modify her/his (f,m,d,u) PST40.
If there any requests or suggestions, please let me know.
Karl (teesekop-spezialisten.de) is going to offer this kit in a few weeks.
If I ever figure it out how to solve CE and safety issues I would even offer the conversion to people who do not dare to disassemble their PST40...
My greatest fear is being married alive.
- Petrus
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Re: It's nearly done....
What a fascinating project! Very impressive setup. Looking forward to your updates on this topic.
~ Petrus ~
Flickr
https://www.flickr.com/people/194757663@N08/
LS80THa DSII - Calcium II K module 12mm - Lunt Herschel wedge 1.25" - Quark Chromosphere - Solarscout Quark - Sol'Ex
Flickr
https://www.flickr.com/people/194757663@N08/
LS80THa DSII - Calcium II K module 12mm - Lunt Herschel wedge 1.25" - Quark Chromosphere - Solarscout Quark - Sol'Ex