Replace PST 20mm etalon with a Solarmax II 60mm one?

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
Moriniboy
The Sun?
The Sun?
Posts: 17
Joined: Sun Jun 15, 2014 7:45 am
Location: Preston, UK

Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Moriniboy » Mon Apr 20, 2015 1:23 pm

Hi,

Is it possible to swap over the PST etalon in my Stage 2 scope to the 60mm one from my Solarmax II double stack unit?

Sure I have read somewhere that the PST has lenses which make the light cone parallel as it passes through the etalon and then converts it back as it exits.

With this in mind I'm assuming that using the Solarmax etalon would not work as the light would not be parallel?
Attachments
P1050811.JPG
Last edited by Moriniboy on Tue Apr 21, 2015 12:49 pm, edited 1 time in total.
Hoping for clear skies.....lol

User avatar
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17951
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by swisswalter » Tue Apr 21, 2015 4:19 am

Hi John

welcome to that wonderful site. Have fun in the sun. Valery from the ukraine can explain how to do it
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

User avatar
marktownley
Librarian
Librarian
Posts: 24527
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by marktownley » Tue Apr 21, 2015 5:23 am

Are you talking about the external 60mm etalon here?
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
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3050
Joined: Sun Nov 18, 2012 3:13 pm

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Valery » Tue Apr 21, 2015 5:26 am

Moriniboy wrote:Hi,

Is it possible to swap over the PST etalon in my Stage 2 scope to the 60mm one from my Solarmax II double stack unit?

Sure I have read somewhere that the PST has lenses which make the light cone parallel as it passes through the etalon and then converts it back as it exits.

With this in mind I'm assuming that using the Solarmax etalon would not work as the light would not be parallel?
At this moment don't think about this. You will sure failed. Better to use PST mod 2 for medium and high resolution imaging. Of course, if your PST etalon is good.
A 60mm scope can be used for a Full Disk (FD) imaging and for visual observing.


Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

User avatar
Moriniboy
The Sun?
The Sun?
Posts: 17
Joined: Sun Jun 15, 2014 7:45 am
Location: Preston, UK

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Moriniboy » Tue Apr 21, 2015 12:37 pm

Thanks for your replies everyone, think I'm going to use it on a 66mm f6 scope for low power full disk and as Valery says keep the stage 2 for medium and high power work.

Will also try it on front of the stage 2 scope but reducing the aperture down to 60mm means it will then be an f16.7 scope and may not work.
Hoping for clear skies.....lol

User avatar
Moriniboy
The Sun?
The Sun?
Posts: 17
Joined: Sun Jun 15, 2014 7:45 am
Location: Preston, UK

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Moriniboy » Sat May 09, 2015 5:25 pm

Decided to get an adaptor made and single stack it on the front of the Equinox 80 instead and slightly modded the inside of the etalon housing to stop reflections.
Attachments
20150509_175729 - Copy.jpg
20150424_075219 - Copy.jpg
20150424_075219 - Copy.jpg (131.74 KiB) Viewed 2364 times
Hoping for clear skies.....lol

User avatar
marktownley
Librarian
Librarian
Posts: 24527
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by marktownley » Sat May 09, 2015 5:33 pm

A very nice looking setup!
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
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17951
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by swisswalter » Sun May 10, 2015 6:46 am

Hi John

that looks good, any first lights?
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

User avatar
Moriniboy
The Sun?
The Sun?
Posts: 17
Joined: Sun Jun 15, 2014 7:45 am
Location: Preston, UK

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Moriniboy » Sun May 10, 2015 7:46 am

Not the best day's viewing yesterday in the UK, but late afternoon I had a couple of cracking views between the clouds.

Loved the fact that compared to my TAL stage 2 mod I can have a full disk detailed view without a sweet spot.

As I will be mounting both side by side on a Skytee 2 I could not be happier.
Hoping for clear skies.....lol

User avatar
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17951
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by swisswalter » Mon May 11, 2015 4:14 am

Hi John

great to hear
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

User avatar
marktownley
Librarian
Librarian
Posts: 24527
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by marktownley » Mon May 11, 2015 5:25 am

Excellent news!
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
Moriniboy
The Sun?
The Sun?
Posts: 17
Joined: Sun Jun 15, 2014 7:45 am
Location: Preston, UK

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Moriniboy » Sat May 23, 2015 9:58 pm

Now paired up with the TAL and as expected the TAL is brilliant for prom close up's and the Equinox shows the full disk
Attachments
P1050925.JPG
Hoping for clear skies.....lol

User avatar
marktownley
Librarian
Librarian
Posts: 24527
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by marktownley » Sun May 24, 2015 6:40 am

a setup for all situations! Nice!
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
Rybak
Ohhhhhh My!
Ohhhhhh My!
Posts: 113
Joined: Mon Sep 16, 2013 8:38 pm
Location: Moscow, Russia

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Rybak » Sun May 24, 2015 1:38 pm

Hi Nigel!
I want to make PST 2mod with my old TAL-100R (1:10). Did you shorten the tube? If yes, what is the length of the shortened tube?
Aleksey

-------------

Lunt LS100THa, Coronado SolarMax II 90 Filter + BF 15 on WO Megrez 90, PST + SW 1025 mod, Quark + SW150/750 in test mode

User avatar
marktownley
Librarian
Librarian
Posts: 24527
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by marktownley » Sun May 24, 2015 1:49 pm

I did a PST mod with my Tal, I took 100mm off the tube and replaced the focuser with a moonlite.
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
Moriniboy
The Sun?
The Sun?
Posts: 17
Joined: Sun Jun 15, 2014 7:45 am
Location: Preston, UK

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Moriniboy » Sun May 24, 2015 3:36 pm

Hi Aleksey, here is a picture of the offcut next to a rule in mm. Also attached is a photo of the adaptor which replaced the original TAL focuser.

Hope they help, Nigel
Attachments
P1050932.JPG
P1050931.JPG
Hoping for clear skies.....lol

User avatar
Rybak
Ohhhhhh My!
Ohhhhhh My!
Posts: 113
Joined: Mon Sep 16, 2013 8:38 pm
Location: Moscow, Russia

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Rybak » Sun May 24, 2015 3:44 pm

Thanks Mark and Nigel!
Aleksey

-------------

Lunt LS100THa, Coronado SolarMax II 90 Filter + BF 15 on WO Megrez 90, PST + SW 1025 mod, Quark + SW150/750 in test mode

axlefoley
Im an EXPERT!
Im an EXPERT!
Posts: 284
Joined: Thu Feb 13, 2014 3:22 am
Location: Townsville Australia

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by axlefoley » Sat May 30, 2015 5:17 am

Nigel can you tell me why you removed the original focuser then cut the tube by about 140mm then made a 60mm adapter then added a focuser on the end of the adapter.

So what I can see is you've cut off 140mm then added on 60mm.

Why not cut off 80mm and leave the focuser.

Maybe I'm missing something,,,,,my wife recons I'm missing something in the brain department.
Alan

User avatar
Moriniboy
The Sun?
The Sun?
Posts: 17
Joined: Sun Jun 15, 2014 7:45 am
Location: Preston, UK

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by Moriniboy » Sat May 30, 2015 9:02 am

Hi Alan,
As the original TAL 100R focuser was 1.25" and only had 25mm of travel I was faced with 2 options
1. replace focuser with 2" version before etalon and then put a helical focuser after it.
2. replace focuser with sliding tube and then a 2" focuser after the etalon.
Picked item 2 because it was cheaper, looked better (IMO) and would lock the critical etalon distance once set.
I took off then added back because there does not seem to be a definative distance to chop off the tube (apart from approx 100mm) and I knew that any slack could be taken up by the tube.
Here are some sketches I prepared beforehand to check the logistics of what I was doing.
Attachments
002 Etalon - focuser adaptor.png
001 Focuser tube design.jpg
001 Focuser tube design.jpg (57.1 KiB) Viewed 2116 times
Hoping for clear skies.....lol

axlefoley
Im an EXPERT!
Im an EXPERT!
Posts: 284
Joined: Thu Feb 13, 2014 3:22 am
Location: Townsville Australia

Re: Replace PST 20mm etalon with a Solarmax II 60mm one?

Post by axlefoley » Sun May 31, 2015 12:21 am

Ok I have a better understanding now, thank you.
Alan

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest