Register    Login    Forum    Members    FAQ

Board index » C Series




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: New C-24 f/3
 Post Posted: Mon May 06, 2013 2:24 am 
Offline
Site Admin

Joined: Thu Jul 02, 2009 2:25 am
Posts: 116
We just completed a new C-24.

This 24" scope has a f/3 Kennedy mirror giving an eyepiece height at zenith of only 67" !

Amazing performance using high power on Saturn last night.

Kennedy has just completed a 36" auto-collimator for his optical shop and this mirror is his first creation using the new system.


Attachments:
C24_f_3.jpg
C24_f_3.jpg [ 54.9 KiB | Viewed 4384 times ]
Top 
 Profile Send private message  
 
 Post subject: Re: New C-24 f/3
 Post Posted: Mon May 06, 2013 2:26 am 
Offline
Site Admin

Joined: Thu Jul 02, 2009 2:25 am
Posts: 116
Here is another picture to give you an idea of how tiny this scope really is.

Yes, you are welcome to use these pictures on other web forums, no need to ask.


Attachments:
C24-f3.jpg
C24-f3.jpg [ 52.6 KiB | Viewed 4383 times ]
Top 
 Profile Send private message  
 
 Post subject: Re: New C-24 f/3
 Post Posted: Mon May 27, 2013 7:46 pm 
Offline

Joined: Sun Jan 31, 2010 9:05 pm
Posts: 12
Awesome.
Looks rock-solid.
Thanks Jim.

Wanting more info on Mr. Kennedy's new auto-collimator.
What is that?
I have no experience in mirror-making.
-David.


Top 
 Profile Send private message  
 
 Post subject: Re: New C-24 f/3
 Post Posted: Thu Jun 06, 2013 5:51 pm 
Offline
Site Admin

Joined: Thu Jul 02, 2009 2:25 am
Posts: 116
lightyear wrote:

Wanting more info on Mr. Kennedy's new auto-collimator.
What is that?
I have no experience in mirror-making.
-David.



The autocollimation or double pass null test is well regarded and widely used in professional optical shops for testing parabolic mirrors.

Like the Ross and Dall tests it is a null test so the ideal parabolic mirror shows straight bands when use with a Ronchi ruling or is seen to darken uniformly when viewed with the knife edge.

However, the test is twice as sensitive as the other null tests as light is reflected off the test optic twice, this makes it a very powerful test. The price to pay for this sensitivity is that the test set up requires a high quality optical flat at least as big as the mirror under test, such an item is difficult to make and very expensive to buy.

With the autocollimation test the mirror is tested at it’s focus unlike the Ross and Dall tests which are at the centre of curvature.

You can read more info at:

http://www.nicholoptical.co.uk/The%20Testing%20of%20Astronomical%20Telescope%20Optics.pdf


Top 
 Profile Send private message  
 
Display posts from previous:  Sort by  
 
Post new topic Reply to topic  [ 4 posts ] 

Board index » C Series


Who is online

Users browsing this forum: No registered users and 1 guest

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron