PST Mod kit... where can I buy one?

[Jesús Muñoz]

Hello,

At last I could unscrew the etalon from the golden tube of my PST, really difficult!!! :dry:

Now I need the Mod kit. Where can I buy one?

Thenks!

Jesus Munoz

[marktownley]

I can most definitely recommend these guys http://www.aokswiss.ch/index_zub.html

[swisswalter]

Hi Jesus

I second that

[vikeljay]

I do not read German. Which is the PST mod kit?

[colinbm]

Nor do I, but Google translate does a good job
http://translate.google.com.au/translat ... 6bih%3D622
Col

[vikeljay]

I looked all over their site but saw nothing stating a PST mod kit. What is it listed as? Thanks.
Jim

[Allcart]

They don't sell a standard 'kit' Jim, just certain components that that are used in mods. These two components are what you would need for stage 1 and stage 2 mods. There are other items needed as well depending on what you are doing. ERF's and blocking filters are such items.
http://translate.google.com.au/translat ... 6bih%3D622

The link did not work correctly, so look under eyepiece and adaptors and it shows you the two PST adaptors. There are dozens of different ways of building a solar modded scope, but these two items are commonly used as part of the design.

[vikeljay]

Which parts are used for PST mods. I cannot tell. Thanks.
Jim

[JohnHicks]

I have a PST, a Coronado 60 mm and a Lunt Pressure-tuned 60 mm.
I'm always trying to pull more detail out of activity areas. The
PST Mod looks interesting. How do the two units shown couple together to fit inside a 2" barrel focuser? It looks to me like you screw the 2" adapter into the etalon assembly. What is the other part with a thumbscrew for? The instructions are far from clear. I would like to try this system on my Meade 102 ED with a
100 mm ERF on the front of the etalon (from Lunt). The 102ED is an
f/9 focal ratio and a good scope to mod with a PST Etalon. By the way, its not as easy to remove the retaining rings as Mark Townly
states. I tried to get the second (large) retaining ring out to no avail. Some Mexican technician must have used lock-tite on it when assembling it. With all the strength I could apply I could not remove that ring - (and a metal rule is not wide enough by the way). I wished to clean the grease off the etalon that sloppy construction smeared right across the lens front. (Meade has poor quality control now that they have jobbed it out of state). Astronomers want perfection - and there is no excuse for this sort of sloppy construction. Would a Meade 102ED still require that -200
mm back focus? Nice process you guys invented, laurels to you for good research. Thomas Boroswski's filtergram equals what Zirin would have done professionally with a million dollar observatory.
His book doesn't have a better image of an activity area .....see("Astrophysics of the Sun"). I design observatories (has anyone you seen my book on observatory design by Springer?). Anyway, I cleaned the front face of the Etalon so I didn't have to take that retaining ring off.

[marktownley]

Ha ha! We must have different sized metal rulers

What focal ratio is your Meade 102ED? PST mods in basic form require f10, if your scope is less, ie f7 then the mod in that case would only be working at 70mm effective aperture because of vignetting.

[marktownley]

I looked all over their site but saw nothing stating a PST mod kit. What is it listed as? Thanks.
Jim

Look in the Okularadapter section

[Allcart]

Little pictures 11 and 12 Jim. 'Special connection for PST-filter to 2 "Focuser'
11 connects to the front of the etalon instead of the gold tube and inserts into the 2" focuser of the telescope. 12 attaches to the back of the etalon instead of the black box and allows you to connect extention tubes/focusers etc to reach the desired length for focusing the ep.

[Merlin66]

I have a pdf write up on PST mods available - just drop me an email for a copy.
The "majic" -200mm is mandatory on any PST mod, unless you replace the front barlow element on the PST etalon assembly.....

[vikeljay]

Yes, please send me the pdf file at [email protected]
And Thanks.
Jim

[JohnM]

Why don't you just do a mini mod like I did to mine for now.
All you need to get it done is an SCT focuser, 2 1/2" SCT thread extensions, and an old 2X1.25" adapter and 3 pan head machine screws.
Performance of the PST is outstanding when you get rid of the funky black box.

[vikeljay]

That sounds really interesting. What did you do? Just what connects to what? Thanks.
Jim

[JohnM]

There's an existing thread.

[JohnHicks]

JohnM

Please elaborate on the adapters a little or send a photo
Many thanks

John Hicks

[JohnM]

http://solarchat.solarastronomy.org/ind ... ni-stage-2