Go Back   IceInSpace > Equipment > Astrophotography and Imaging Equipment and Discussions

Reply
 
Thread Tools Rate Thread
  #1  
Old 14-12-2011, 09:29 PM
Carl
Registered User

Carl is offline
 
Join Date: Apr 2006
Location: Alans Flat
Posts: 373
Further question on Losmandy Plate and ed120 scope

Any chance of a fast reply appreciated.
Thanks for all of your replies before but i think i have missled everyone with the wrong question so i'll try again.

What concerns me is the bowing effect of a scope and how that bowing effects an image.

Scope: Skywatcher ed120 APO
Mount: Skywatcher EQ6 Wide 'D' style mount
Camera on back of scope: Canon 500d plus field flattener ect.

I currently have an ADM Losmandy D style Universal plate 11" long 4" wide. When i attach the scope rings the distance between rings is 8".

On top of the rings i have a mini dovetail plate attached. This screws on and secures to the main scope rings, forming a rigid assembly. The mini dovetail only supports a modified 9x50 finder/guidescope using an Orion auto guidercamera (very light).

Flexure between guiding and imaging scope was not an issue when imaging with an 80ed refractor.

So my question i think, should have been the following:
Taking into consideration weight at the front and back of the ed120 do i need a longer base plate to avoid bowing the scope? Or am i being an absolute tool and worrying over nothing?

Regards
Carl
Reply With Quote
  #2  
Old 14-12-2011, 10:51 PM
Poita (Peter)
Registered User

Poita is offline
 
Join Date: Jun 2011
Location: NSW Country
Posts: 3,585
I'd say worrying over nothing, but just to be sure, how long is the ED120? Take a picture of your setup so we can get a look.
I have a longer losmandy plate sitting on the shelf here if it worries you overmuch.
Reply With Quote
  #3  
Old 15-12-2011, 06:07 AM
Carl
Registered User

Carl is offline
 
Join Date: Apr 2006
Location: Alans Flat
Posts: 373
Hi Peter
All up it would be about 1000mm when you extend the focuser and add the camera. Thank's for the offer on the Losmandy plate, how wide is it and how much do you want for it?

Regards
carl
Reply With Quote
  #4  
Old 15-12-2011, 08:11 AM
adman (Adam)
Seriously Amateur

adman is offline
 
Join Date: Sep 2009
Location: Brisbane
Posts: 1,279
Hi Carl, with that setup, the scope mounting is not going to be a significant source of flexure. The places you want to pay attention to are the focuser and the camera attachment as both of these can move slightly as the scope moves when tracking an object. If you are guiding, then any relative movement of the imaging scope and guide scope can give you problems as well.

At your focal length which is less than a metre, it will be reasonably forgiving. Have you taken any images with this setup yet which you think might show some flexure happening? The rule here is if it ain't broke don't fix it. Worry about flexure if you are getting it, but if you are getting good images, then don't spend money chasing problems that might not exist.

Adam
Reply With Quote
  #5  
Old 15-12-2011, 09:01 AM
Poita (Peter)
Registered User

Poita is offline
 
Join Date: Jun 2011
Location: NSW Country
Posts: 3,585
You shouldn't be getting any 'bowing' with your current setup.
Give it a go and see if you get any flex related issues.
Reply With Quote
  #6  
Old 15-12-2011, 07:13 PM
Carl
Registered User

Carl is offline
 
Join Date: Apr 2006
Location: Alans Flat
Posts: 373
Thanks everyone for your advice
You're right, set it up and see how it goes.

Merry Christmas to you all
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 09:38 PM.

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