#1  
Old 29-08-2011, 03:37 PM
hotspur's Avatar
hotspur (Chris)
Registered User

hotspur is offline
 
Join Date: Apr 2009
Location: south east QLD,Australia
Posts: 2,868
Backlash-Sloppy motor issues,advice sort.

Hello.

Just getting into a little AG'ed astro photography.Have cable issues sorted and the Orion AG system is certainly working,with no problems.

I had a quick 10 shots last night,at two objects,But I was not impressed with success rate,Only one image was half reasonable.

It appears there is backlash/sloppy-ness in the motors,there is some comp adjustment on paddle so I will try that.Just wondering what I can do if tat does not get a bit higher success rate.

Or am I expected too much from such a short session?? I hear people say this AGing can be hit and miss??,some nights its all good.

Only after a couple of shots on the second object,did the AG seem to work better,and I changed the setting from 2.5 sec capture to 1 sec capture.

The mount is permantly set up and PA,and worked well unguided with DD1 set up for up to 3 minute exp.I hope This new set up gets better as I spend more time on it.

Any thoughts opr advice welcome-thanks Chris
Reply With Quote
  #2  
Old 29-08-2011, 04:21 PM
Bassnut's Avatar
Bassnut (Fred)
Narrowfield rules!

Bassnut is offline
 
Join Date: Nov 2006
Location: Torquay
Posts: 5,064
Unbalance the mount a tad, so it always drives, not push/pull. This will make backlash irrelivant (for guiding).
Reply With Quote
  #3  
Old 29-08-2011, 05:05 PM
adman (Adam)
Seriously Amateur

adman is offline
 
Join Date: Sep 2009
Location: Brisbane
Posts: 1,279
yep unbalance the mount in RA a little so its east heavy - but this wont help DEC backlash - where are you getting it most? Its most likely to need attention to the meshing of the DEC worm and main gear.

Adam
Reply With Quote
  #4  
Old 29-08-2011, 05:23 PM
hotspur's Avatar
hotspur (Chris)
Registered User

hotspur is offline
 
Join Date: Apr 2009
Location: south east QLD,Australia
Posts: 2,868
re guiding

Thanks Adam and Fred.

Yes-I can hear 'shunting' noise-which I imagine is the 'Push-Pull' you mention.

The RA is fairly well balanced,so will unbalance the as you mention.The DEC
is a bit unbalance-as when the camera is racked out to focus,is heavier that end,I will balance it properly if you think that would help.

Also,I have yet to properly set the B.L comp on the paddle,So all of this is not a major thing to improve on.I am hopping such actions will improve the issue.

Not sure what else to do if these actions do not improve it.I did do a ten minute exp of M 83 a couple of months back,and it was quite good.it was almost overhead.

Thanks for help-Chris

PS I'll post an image from last night to show trails as it came out of camera (if I can find it in the bin)
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 06:03 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement