Go Back   IceInSpace > Equipment > Equipment Discussions

Reply
 
Thread Tools Rate Thread
  #1  
Old 13-09-2013, 12:16 PM
PeterHA (Peter)
Murphy's Friend

PeterHA is offline
 
Join Date: Jun 2013
Location: Glen Waverley, Melbourne
Posts: 133
Takahashi optimised for mirror or prism

All,
Some designs of refracting scopes (Zeiss) take a glass path like a prism star diagonal into consideration when the optics are designed.
Other designs are optimised to perform best with mirros star diagonals.

Does anyone know what Takahashi bases it's optical calculations for refractors on.
Are the Sky90, TS-102 and 120 better used with prism diagonals or with mirror diagonals?

Thanks for any help,

Regards,

Peter
Reply With Quote
  #2  
Old 13-09-2013, 12:29 PM
brian nordstrom (As avatar)
Registered User

brian nordstrom is offline
 
Join Date: Apr 2007
Location: Perth WA
Posts: 4,374
Hi Peter , I have a SKY90 and use it with a 2 inch , GSO Quartz 99% dielectric and I find this diagonal to be very good in this scope , better than my Zeiss prisim diagonal but I cant use the GSO in the Zeiss as its 1 1/4 inch only .
The Zeiss prism diagonal is better than my William optics 99% diagonal in my Zeiss tho , less light scatter around brighter objects with the Zeiss prisim diagonal and more natural tones ( in my eyes ) on the moon , perfect ! .
Hope this helps .
Brian..
Reply With Quote
  #3  
Old 13-09-2013, 02:45 PM
Kunama
...

Kunama is offline
 
Join Date: Sep 2012
Posts: 3,588
Some references indicate that they are based on the prism however Tak also do a mirror.
I am going to get the 1.25" Tak prism for my new FS60CB (mainly for the non-marring, self centering eyepiece clamping feature).
On the TSA120 I am using the WO 2" dielectric mirror (came with the scope) but will be switching this to the Baader Click-lock in the future (for the same reason)
I find that the WO actually tilts the EP when tightened.

Last edited by Kunama; 13-09-2013 at 05:44 PM.
Reply With Quote
  #4  
Old 13-09-2013, 04:51 PM
Steffen's Avatar
Steffen
Ebotec Alpeht Sicamb

Steffen is offline
 
Join Date: Feb 2010
Location: Toongabbie, NSW
Posts: 1,906
Centering the eyepiece isn't nearly as important as holding it parallel to the optical axis, BTW. The clamps don't help in that regard, but the Glatter Parallizer does.

I find that the Tak prism produces visibly less scatter than any of the mirror diagonals I've used in my 6" Mak.

Cheers
Steffen.
Reply With Quote
Reply

Bookmarks

Tags
mirror, prism, refractor

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 04:50 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Advertisement
Limpet Controller
Advertisement
Testar
Advertisement
Bintel
Advertisement
NexDome Observatories
Advertisement
Astronomy and Electronics Centre
Advertisement