Williams 102 mod?

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
Robin
Almost There...
Almost There...
Posts: 716
Joined: Thu Jan 24, 2013 1:48 pm
Location: Sussex England

Williams 102 mod?

Post by Robin » Sat Jun 08, 2013 9:11 pm

In my quest to upgrade from my PST I have enquired as to buying a new Meade or Lunt and it has been suggested that I could mod a refractor -question, I have a Williams Megrez 102mm which I use for DSO imaging, would this be suitable for modification. I would not want it to be permanent but be able to remove filters and use for night imaging. I assume from studying the posts on the forum that I would need a BF and a ERF for this conversion. Can anyone tell me if this is a goer and what filters I would need to purchase and where to get them
Many Thanks, great Forum
Robin
Lunt LS60THa / B1200 / LS60Fha / DMK51AOU2 / DMK21AOU2 / Revelation 6 & 8" RC / Opticon Minitower 11 & Startracker / Mad Red Setter and understanding Wife

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: Williams 102 mod?

Post by swisswalter » Sun Jun 09, 2013 7:07 am

Hi Robin

depending on the focal length there is more to do. Has it f/10 ?
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
Robin
Almost There...
Almost There...
Posts: 716
Joined: Thu Jan 24, 2013 1:48 pm
Location: Sussex England

Re: Williams 102 mod?

Post by Robin » Sun Jun 09, 2013 8:54 am

Hi Walter

Its a f/7

Robin
Lunt LS60THa / B1200 / LS60Fha / DMK51AOU2 / DMK21AOU2 / Revelation 6 & 8" RC / Opticon Minitower 11 & Startracker / Mad Red Setter and understanding Wife

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: Williams 102 mod?

Post by swisswalter » Sun Jun 09, 2013 12:57 pm

Hi Robin

so you need a 25mm negativ lens with -145 mm FL to be put up front the PST mod
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: 25613
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Williams 102 mod?

Post by marktownley » Sun Jun 09, 2013 7:15 pm

OK, easiest and cheapest way to mod with this scope:

Get a 75mm Baader D-ERF http://www.teleskop-express.de/shop/pro ... ation.html 255 Euros

Get a PST nosepice ~£25

You would then have a 70mm stage 1 PST mod for less than 300 quid.

To improve, go to stage 2, with a couple more adapters and a SCT focuser....
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
Robin
Almost There...
Almost There...
Posts: 716
Joined: Thu Jan 24, 2013 1:48 pm
Location: Sussex England

Re: Williams 102 mod?

Post by Robin » Sun Jun 09, 2013 8:09 pm

Hi Mark
Thanks, where could I obtain a PST nosepiece £25 Or I don't mind investing in a BF and would I need a filter holder to match the 102mm ?
Robin
Lunt LS60THa / B1200 / LS60Fha / DMK51AOU2 / DMK21AOU2 / Revelation 6 & 8" RC / Opticon Minitower 11 & Startracker / Mad Red Setter and understanding Wife

User avatar
marktownley
Librarian
Librarian
Posts: 25613
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Williams 102 mod?

Post by marktownley » Sun Jun 09, 2013 8:38 pm

http://www.aokswiss.ch/d/zub/adapter/50.8-pst.html

Used like this in the picture you would not need another BF. I can machine you a filter cell holder for the D-ERF.
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: Williams 102 mod?

Post by swisswalter » Sun Jun 09, 2013 9:23 pm

http://www.aokswiss.ch/d/zub/adapter/50.8-pst.html

Used like this in the picture you would not need another BF. I can machine you a filter cell holder for the D-ERF.

Hi Mark

can you also maschine a filterholder for a 203 mm lens with threads :?
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: 25613
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Williams 102 mod?

Post by marktownley » Sun Jun 09, 2013 9:49 pm

Hi Mark

can you also maschine a filterholder for a 203 mm lens with threads :?

I could if you need me to - I assume to hold an ERF? It wouldn't have threads, but would be easy enough to engineer an interference fit...
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: Williams 102 mod?

Post by swisswalter » Sun Jun 09, 2013 10:18 pm

Hi Mark

great, absolutely great

We will discuss that at the next outreach at wolfhalden ;-)
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: 25613
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Williams 102 mod?

Post by marktownley » Sun Jun 09, 2013 11:23 pm

If you give me the sizes beforehand I will bring it to Wolfhalden for the outreach ;)
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: 3254
Joined: Tue Dec 13, 2011 1:23 pm
Location: St Leonards, Australia
Contact:

Re: Williams 102 mod?

Post by Merlin66 » Mon Jun 10, 2013 12:20 am

Robin, a couple of comments...
1. Make sure you have enough space to get the PST etalon 200mm inside prime focus.
2. The PST etalon works at f10 (unless you change lenses on the assembly) which will result in an effective 70mm aperture.
"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
Robin
Almost There...
Almost There...
Posts: 716
Joined: Thu Jan 24, 2013 1:48 pm
Location: Sussex England

Re: Williams 102 mod?

Post by Robin » Mon Jun 10, 2013 9:15 am

Thanks Guys for all your advice I am now going to consider whether to carry out a mod or invest in a new telescope all together, I want to get the best out of imaging within my budget a mod may not be the answer. Thanks again
Robin
Lunt LS60THa / B1200 / LS60Fha / DMK51AOU2 / DMK21AOU2 / Revelation 6 & 8" RC / Opticon Minitower 11 & Startracker / Mad Red Setter and understanding Wife

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: Williams 102 mod?

Post by swisswalter » Mon Jun 10, 2013 5:29 pm

I am now going to consider whether to carry out a mod or invest in a new telescope all together, a mod may not be the answer. Thanks again
Robin

Hi Robin

maybe I do not understand english very well, but you could consider next time, when you set up a help mod question, to narrow down the search field a little bit
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
Robin
Almost There...
Almost There...
Posts: 716
Joined: Thu Jan 24, 2013 1:48 pm
Location: Sussex England

Re: Williams 102 mod?

Post by Robin » Mon Jun 10, 2013 5:37 pm

OK. query now resolved thanks. Your English is very good :)
Robin
Lunt LS60THa / B1200 / LS60Fha / DMK51AOU2 / DMK21AOU2 / Revelation 6 & 8" RC / Opticon Minitower 11 & Startracker / Mad Red Setter and understanding Wife

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest