#1  
Old 19-11-2018, 05:43 PM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie
Posts: 5,350
Which one to keep?

As my clearance continues, I am now down to two imaging scopes: a TS80 f7 APO and the TS115 f7 APO. Which one to keep?
They both take the same 3" (0,79x) reducer corrector, and thus both run at f5,53 reduced. Regarding the colour correction, the 80 is an FPL-53 Doublet, and the 115 is a FPL-51 and Lanthanum Triplet (has a slight edge in performance, but is heavier of course).

So it comes down to focal length, weight, and correction. Opinions?
Reply With Quote
  #2  
Old 19-11-2018, 05:44 PM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 18,243
TS115 f7 APO
Reply With Quote
  #3  
Old 19-11-2018, 06:08 PM
Slawomir's Avatar
Slawomir (Suavi)
Amateur Photon Collector

Slawomir is offline
 
Join Date: Sep 2014
Location: Proserpine
Posts: 3,023
Same what Marc recommended. If carrying a 115 triplet is not a big issue, then it should be a more capable instrument for imaging due to being better corrected for field curvature (longer focal length) and most likely having smaller spot size than the 80mm one (larger aperture + triplet). It will also provide with more exciting views if used visually.
Reply With Quote
  #4  
Old 19-11-2018, 06:09 PM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 6,339
If the 115mm weight wise isn’t going to be an issue I’d definitely go with that. Better colour correction and a bit more aperture is worth it if you can handle it
Reply With Quote
  #5  
Old 19-11-2018, 07:02 PM
LewisM
Novichok test rabbit

LewisM is offline
 
Join Date: Aug 2012
Location: Somewhere in the cosmos...
Posts: 9,326
So long as you can comfortably manage the 115, I'd definitely stick to the 115.

But if your health is such that it is not so "fun", go with the 80.
Reply With Quote
Reply

Bookmarks

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 03:46 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Celestron Australia
Advertisement
Meade Australia
Advertisement
Lunatico Astronomical
Advertisement
OzScopes Authorised Dealer
Advertisement
SkyWatcher Australia
Advertisement
NexDome Observatories
Advertisement
Bintel
Advertisement
Astronomy and Electronics Centre
Advertisement