Jump to content


Photo

RC for Visual?

  • Please log in to reply
7 replies to this topic

#1 desertlens

desertlens

    Viking 1

  • *****
  • Posts: 845
  • Joined: 06 Dec 2010
  • Loc: 36°N 105°W

Posted 26 August 2014 - 05:26 PM

The title asks my question. Is there any reason the RC design wouldn't work at least as well for visual as compared to a similar SCT? It strikes me that a fixed hyperbolic primary might offer some advantage.


Edited by desertlens, 26 August 2014 - 05:27 PM.


#2 mogur

mogur

    Apollo

  • *****
  • Posts: 1159
  • Joined: 29 Jul 2011
  • Loc: WI

Posted 26 August 2014 - 07:54 PM

It can be used visually. You'll need extension tubes for most low power EP's to reach focus though.



#3 Cyclop_si

Cyclop_si

    Viking 1

  • *****
  • Posts: 676
  • Joined: 13 Mar 2008
  • Loc: Slovenia

Posted 27 August 2014 - 12:40 AM

Is there a reason not to drive to job by truck? Not really, however most would prefer car. But also truck might have some advantages for somebody.

 

In my eyes, RC is not optimal visual scope, but I agree, it wont hurt if you put eyepiece into focuser.



#4 GJJim

GJJim

    Surveyor 1

  • -----
  • Posts: 1675
  • Joined: 09 Sep 2006
  • Loc: Western CO

Posted 27 August 2014 - 09:50 AM

Those long diffraction spikes are to die for!  :cool:



#5 rmollise

rmollise

    Hubble

  • *****
  • Posts: 15692
  • Joined: 06 Jul 2007

Posted 27 August 2014 - 01:06 PM

One can be used for satisfactory deep sky performance. Due to the large central obstruction, you probably wouldn't want one just for that purpose, however. ;)



#6 WebFoot

WebFoot

    Viking 1

  • *****
  • Posts: 809
  • Joined: 02 Jun 2005
  • Loc: Redmond, WA, USA

Posted 27 August 2014 - 01:32 PM

Yeah, it'll be ok.  But I wouldn't buy one principally for visual work, since you'll get better views, for less money, from a good SCT of the same aperture.



#7 desertlens

desertlens

    Viking 1

  • *****
  • Posts: 845
  • Joined: 06 Dec 2010
  • Loc: 36°N 105°W

Posted 27 August 2014 - 06:39 PM

Thanks all... I wasn't sure about the central obstruction... probably the deal breaker.



#8 Dan McConaughy

Dan McConaughy

    Ranger 4

  • -----
  • Posts: 309
  • Joined: 11 Nov 2006
  • Loc: LA

Posted 30 August 2014 - 08:11 PM

I use a 16" F/12 R-C for visual and it's pretty good.  The obstruction is 5".  I like being able to collimate both mirrors and tweak final collimation looking through the eyepiece while adjusting the primary.  It's better than the C14s I had but not a lot - like the difference between an 8" and a 7" when the 8" is a little better optically.  The open tube means you have to clean the primary now and then.  The secondary stays amazingly clean.








Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics