Results 1 to 3 of 3
  1. #1
    WLUBAK's Avatar
    WLUBAK is offline White Dwarf
    Points: 1,920, Level: 27
    Level completed: 20%, Points required for next Level: 80
    Overall activity: 0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!5 Threads Achievement!First 1000 Experience Points750 Days+ Registered Achievement!
    Join Date
    May 2016
    Location
    FRANCE
    Posts
    10
    Points
    1,920
    Level
    27
    Thanks
    0
    Thanked 0x 0 Posts

    Question Skywatcher Dobson Focus Problem



    I have a friend with a Skywatcher 200 Dobson. I just wanted to do a test for him during the day so I pointed at a tree about 50 meters away and focused with the 25mm eye piece. The image was crystal clear. I then focused on something about 1 kilometer away using the same 25mm eye piece. No matter what I did I was not able to bring the object into focus. By the way, I checked the collimation of his telescope and it looks OK but I could not do an exact measurement.

    At home I have previously done the same thing with my Celestron 130 with a 40mm eye piece with, In this case I had perfect focus at both close and distance ground objects.

    Any Ideas?

  2. #2
    billp's Avatar
    billp is offline Bronze Supporter
    Points: 8,035, Level: 62
    Level completed: 62%, Points required for next Level: 115
    Overall activity: 1.0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!First 1000 Experience Points1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Feb 2011
    Location
    Atlanta, GA
    Posts
    281
    Points
    8,035
    Level
    62
    Thanks
    83
    Thanked 73x 57 Posts

    Default Re: Skywatcher Dobson Focus Problem

    Yeah, you need a bit more back focus.

    I have the same issue with an eyepiece in my AD8. As a short term fix, just pull the eyepiece up a bit in the focuser and tighten the retention screw. I wound up installing a parfocal ring on the offending eyepiece as a semi-permanent solution.

    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.
    AD8 w/HALO
    Eyepieces: 2" - 27mm Tele Vue Panoptic, 1.25" - Tele Vue DeLite 18.2mm, 11mm & 7mm, Vixen 9 and 6 mm SLV
    Finders: 8x50 RACI and Rigel Quickfinder
    Binoculars: 10x50 Pentax PCF WP II

  3. #3
    dwheels's Avatar
    dwheels is offline Main Sequence
    Points: 4,732, Level: 46
    Level completed: 91%, Points required for next Level: 18
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!
    Join Date
    Mar 2015
    Location
    Fullerton, California, USA
    Posts
    186
    Points
    4,732
    Level
    46
    Thanks
    23
    Thanked 58x 33 Posts

    Default Re: Skywatcher Dobson Focus Problem

    I had the same problem. The Skywatcher comes with two eyepiece adapters, one for 1.25" and one for 2". If you stack them, which you can do, you can't focus at infinity. You only need one.

    Don
    114mm f8 Celestron Dob, 8" f6
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Classic Dob.
    Cheap Celestron 10x50 binoculars and various inexpensive eyepieces

 

 

Similar Threads

  1. Skywatcher 12" Dobsonian focus problem
    By charlesm in forum Dobsonian Telescopes Forum
    Replies: 11
    Last Post: 07-05-2017, 04:15 PM
  2. Amateur bought a Skywatcher Dobson 8 200P
    By Noobie in forum Forum Welcomes Introductions
    Replies: 13
    Last Post: 12-11-2012, 02:26 PM
  3. Skywatcher 8" dobson
    By Marcel Kanon in forum General Astronomy Forum
    Replies: 1
    Last Post: 08-18-2003, 04:19 PM

Tags for this Thread

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 11:31 AM.