Results 1 to 2 of 2
Like Tree1Likes
  • 1 Post By KathyNS

Thread: LX200 GPS Polar Align ?

  1. #1
    mackiedlm's Avatar
    mackiedlm is offline White Dwarf
    Points: 583, Level: 11
    Level completed: 66%, Points required for next Level: 17
    Overall activity: 0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!
    Join Date
    Dec 2018
    Location
    Ireland
    Posts
    7
    Points
    583
    Level
    11
    Thanks
    0
    Thanked 0x 0 Posts

    Default LX200 GPS Polar Align ?



    I have just got a wedge for my LX200 GPS and have read up the manual on how to polar align. I think I get most of it but would appreciate if anyone could help clarify a couple of things I'm uncertain of;

    Once it s in "Polar Home" is it going to turn the scope around so I can use the finder?
    Once I've centred Polaris is it going to slow to another star to complete goto alignment or is that centering on Polaris going to be good enough.
    Should I do another 2 star align at this stage or is that one star polar going to give accurate enough goto's
    If I want to then do precise polar align, probably with PHD2 or Sharpcap, at which point in the process should
    I do that

    Also, I've been reading about polar alignment so understand that you need to have Polaris off centre in a polar scope. So how is centering on Polaris going to work? Is it just that its "close enough" for visual and subsequent precise align (drift or other) is needed for astro photography.

    Thanks in advance. I just want to have it all clear in my head so that if I ever get another clear sky I can hopefully get the wedge set up with minimal trauma.

    David

  2. #2
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 172,829, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 32.0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts AchievementGot three Friends
    Awards:
    Reply Award
    Join Date
    Nov 2010
    Location
    Nova Scotia
    Posts
    25,166
    Points
    172,829
    Level
    100
    Thanks
    6,659
    Thanked 14,981x 9,540 Posts
    Blog Entries
    3

    Default Re: LX200 GPS Polar Align ?

    I don't know the LX200 mounts, other than that they are fork mounts.

    Polar aligning a fork mount is a bit tricky since there is no polar scope to help. I assume you are using some kind of electronic aid in the handset? I have an old manual (Celestron) fork mount that I have to polar align by pointing the scope at the pole. Once you have completed the polar alignment, you are free to point the scope elsewhere, because it is the mount that you are aligning, not the telescope.

    Polar alignment is totally separate from goto alignment. They are two different alignments, doing two different things. In some electronic polar alignments, you have to do a preliminary goto alignment, then do the polar alignment, then go back and to the "real" goto alignment. Not knowing the Meade system, I don't know if yours is like that.

    With a fork mount, where you have no polar scope to help, a drift alignment is prudent. You can do one manually with a reticle eyepiece, or use one of the software-based drift alignment aids, like PHD or Sharpcap.

    Not knowing the Meade alignment routine, I don't know how they use Polaris. In a polar scope, Polaris must be off-centre by a specific amount, in a specific direction, which varies with date and time. Doing a manual polar alignment with my fork mount, I make sure that the North Celestial Pole is centred, which means identifying the surrounding star field. Not easy to do in light pollution. I determine the centre by rotating the mount in RA: it is the centre of rotation that matters, not the centre of the visual field. Polaris ends up off-centre. I assume that the Meade alignment must do something comparable.

    Putting Polaris at the centre gives an alignment that is adequate for visual use, but not close enough for long exposure photography.
    mackiedlm likes this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    DSO AP:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    (pier);
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    .

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

 

 

Similar Threads

  1. Polar align a go-to or not
    By wb5hqh in forum Astronomy Beginners Forum
    Replies: 4
    Last Post: 03-25-2019, 11:24 PM
  2. Polar Align
    By kreyzie in forum Astronomy Beginners Forum
    Replies: 6
    Last Post: 06-06-2012, 06:02 AM
  3. Who needs Polar Align?
    By Voyager3 in forum Telescope Mounts Forum
    Replies: 4
    Last Post: 04-01-2012, 04:11 PM
  4. polar align
    By zonkerlopez in forum Astronomy Beginners Forum
    Replies: 5
    Last Post: 03-06-2012, 08:55 PM
  5. Polar align.. or no polar align
    By thsee in forum Astronomy Beginners Forum
    Replies: 3
    Last Post: 08-17-2010, 08:49 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 01:44 AM.