PST Blocking Filter modification unit by AOKSwiss

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
Post Reply
User avatar
nicosolcy
Oh, I get it now!
Oh, I get it now!
Posts: 23
Joined: Wed Mar 30, 2016 5:10 am

PST Blocking Filter modification unit by AOKSwiss

Post by nicosolcy » Wed Aug 14, 2019 10:53 am

If of interest to any of you, this http://www.aokswiss.ch/d/zub/adapter/ps ... iegel.html seems interesting as a means to squeeze something more out of a PST quite easily!
Nick
---------------------------------------------------------------
Solar observing... Because you need your Vitamin D!

bart1805
Almost There...
Almost There...
Posts: 566
Joined: Mon Feb 06, 2017 9:04 pm
Location: The Netherlands

Re: PST Blocking Filter modification unit by AOKSwiss

Post by bart1805 » Wed Aug 14, 2019 6:46 pm

Nice! The interesting and new part is the prism with the right thread to screw the BF5 in.

User avatar
Merlin66
Librarian
Librarian
Posts: 3279
Joined: Tue Dec 13, 2011 1:23 pm
Location: St Leonards, Australia
Contact:

Re: PST Blocking Filter modification unit by AOKSwiss

Post by Merlin66 » Thu Aug 15, 2019 1:28 am

A worthwhile addition to the "PST Mod"....
I wonder if adding this diagonal immediately behind the etalon assembly (as suggested) will provide the optimum 200mm spacing to the focus?
"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

User avatar
nicosolcy
Oh, I get it now!
Oh, I get it now!
Posts: 23
Joined: Wed Mar 30, 2016 5:10 am

Re: PST Blocking Filter modification unit by AOKSwiss

Post by nicosolcy » Thu Aug 15, 2019 1:49 am

Beat Kohler (owner of AOKSwiss) is pretty responsive to emails. I no longer have a PST, but thought this would be of interest as a quick fix for improving either a stock PST or for mods with it...
Nick
---------------------------------------------------------------
Solar observing... Because you need your Vitamin D!

User avatar
marktownley
Librarian
Librarian
Posts: 25962
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: PST Blocking Filter modification unit by AOKSwiss

Post by marktownley » Thu Aug 15, 2019 1:27 pm

Interesting!
Image
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!

User avatar
Merlin66
Librarian
Librarian
Posts: 3279
Joined: Tue Dec 13, 2011 1:23 pm
Location: St Leonards, Australia
Contact:

Re: PST Blocking Filter modification unit by AOKSwiss

Post by Merlin66 » Fri Aug 16, 2019 7:33 am

I’ve sent an email to Beat asking about the optical length of his rear adaptor.
As we know the standard PST etalon assembly focuses 200mm behind the rear lens.
"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

User avatar
Merlin66
Librarian
Librarian
Posts: 3279
Joined: Tue Dec 13, 2011 1:23 pm
Location: St Leonards, Australia
Contact:

Re: PST Blocking Filter modification unit by AOKSwiss

Post by Merlin66 » Sat Aug 17, 2019 7:02 am

Beat was very quick with a reply.
I'll post it here for the benefit of the group:
""
Your right, but most regular refractors have not 200 mm back focus. So the most users will not cut the tube; also because it's not easy and you will made many scratches normally with this..... well it's right, but the original block filter has a diameter of 5 mm and the image seams to be good enough, often better than with the original prism of the PST. Most tube will have about 150 - 160 mm backfocus, the version I made will have a optical length of about 150 mm as it work on most refractors without cutting the tube.

But your right and I have still the normal 2" back adapter allow you to use a bigger block filter unit from Lunt or Coronado which give the longer back focus - if your scope have so much back focus....

So I think is a compromise, but for many users is the better compromise and a step into a better solar observing than with the original lens.

Best wishes
Beat Kohler
""
"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

Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests