Results 1 to 7 of 7
Like Tree10Likes
  • 6 Post By Jeff DElia
  • 1 Post By Mag95On
  • 1 Post By Jeff DElia
  • 1 Post By Altocumulus
  • 1 Post By Altocumulus

Thread: How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser

  1. #1
    Jeff DElia's Avatar
    Jeff DElia is offline Bright Giants
    Points: 6,291, Level: 54
    Level completed: 71%, Points required for next Level: 59
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!First 1000 Experience Points
    Join Date
    Sep 2013
    Location
    Rolesville, NC, USA
    Posts
    222
    Points
    6,291
    Level
    54
    Thanks
    102
    Thanked 57x 47 Posts

    Default How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser



    Hi

    I own a Lunt LS50THa which I upgraded with their optional 1.25” Feather Touch Focuser (a big improvement over their standard Helical Focuser). When imaging the Sun, my typical set up is to have the scope out on the deck and my laptop inside my screened in porch (where I can view the image without any glare).

    The problem with this set up is trying to achieve sharp focus. When imaging by myself, I have to keep going back and forth from the scope to the laptop to try and tweak the focus. When I can convince my wife to help, the process involves one of us watching the screen and shouting out to the other person when the focus looked good. The problem here is the delay between when one person can say “Okay, stop” and the other person can actually stop moving the focus knob.

    I needed a way to focus the scope remotely, but I couldn’t find anything available commercially, so I attempted to put something together myself. It's not very pretty, but it does what I need it to do. This video briefly outlines how I motorized the focus on this scope.



    Thanks

    Jeff
    Explore Scientific 80MM FCD100 APO, 10" Meade LX200 Classic (1994) recently upgraded with George Dudash's Autostar Upgrade Kit,
    8" Celestron NexStar Evolution, 6" Celestron Newtonian Telescope, Lunt LS50THa Double Stacked
    Celestron Advanced VX Mount
    Oberwerk 15x70mm Ultras, Oberwerk 20x80mm Deluxe III Binoculars on a Parallelogram built by Dave Leclerc

  2. The Following User Says Thank You to Jeff DElia For This Useful Post:

    Mag95On (03-26-2019)

  3. #2
    Mag95On's Avatar
    Mag95On is offline Bright Giants
    Points: 3,420, Level: 38
    Level completed: 47%, Points required for next Level: 80
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!
    Join Date
    Dec 2017
    Location
    Greater London
    Posts
    263
    Points
    3,420
    Level
    38
    Thanks
    406
    Thanked 61x 61 Posts

    Default Re: How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser

    Thats great work Jeff. I've heard of motorized focusers and that AScOM compatible ones can be controlled in acquisition programs like APT or SGPT, maybe Sharpcap. I started imaging the sun using a Quark Chromosphere, but found having to look into the laptop and adjust with my hand very challenging. Is your focuser remote controlled? Can you adjust 1 or a few microsteps of the motor? Looks like I will need to do something similar if Inam to get good results in solar imaging. Thanks.
    Jeff DElia likes this.
    Magnus
    OTA: Altair Starwave 70ED F6, SW 150mm PDS // Mount:SW EQ3 Pro, Vixen polarie // Imaging: ASI120mm-S; Canon 100D, 7D, 6D, Samyang 14mm,85mm // Solar:Quark Chromosphere; Baader Solar filter //
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : CdC, GRIP, DSS, LR 6, Sequator, Adobe PSE 8, Sharpcap, AS, RS 6, MagicLantern

  4. #3
    Jeff DElia's Avatar
    Jeff DElia is offline Bright Giants
    Points: 6,291, Level: 54
    Level completed: 71%, Points required for next Level: 59
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!First 1000 Experience Points
    Join Date
    Sep 2013
    Location
    Rolesville, NC, USA
    Posts
    222
    Points
    6,291
    Level
    54
    Thanks
    102
    Thanked 57x 47 Posts

    Default Re: How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser

    Thanks Magnus.

    My set up is strictly manually controlled. I have a 25 foot cable connected between the motor and the hand controller which I use to adjust the focus remotely from my porch. It's only an analog motor, but if I set the speed to a slow setting and quickly hit the focus in/out button, I can get it to move in pretty small increments. It's not very sophisticated but it does what I need it to do.

    Thanks

    Jeff
    Altocumulus likes this.
    Explore Scientific 80MM FCD100 APO, 10" Meade LX200 Classic (1994) recently upgraded with George Dudash's Autostar Upgrade Kit,
    8" Celestron NexStar Evolution, 6" Celestron Newtonian Telescope, Lunt LS50THa Double Stacked
    Celestron Advanced VX Mount
    Oberwerk 15x70mm Ultras, Oberwerk 20x80mm Deluxe III Binoculars on a Parallelogram built by Dave Leclerc

  5. #4
    Mag95On's Avatar
    Mag95On is offline Bright Giants
    Points: 3,420, Level: 38
    Level completed: 47%, Points required for next Level: 80
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!
    Join Date
    Dec 2017
    Location
    Greater London
    Posts
    263
    Points
    3,420
    Level
    38
    Thanks
    406
    Thanked 61x 61 Posts

    Default Re: How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser

    Ok, thats interesting Jeff. I will check out the details of your setup again. I am not really keen to buy an expensive motorised focuser yet...
    Magnus
    OTA: Altair Starwave 70ED F6, SW 150mm PDS // Mount:SW EQ3 Pro, Vixen polarie // Imaging: ASI120mm-S; Canon 100D, 7D, 6D, Samyang 14mm,85mm // Solar:Quark Chromosphere; Baader Solar filter //
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : CdC, GRIP, DSS, LR 6, Sequator, Adobe PSE 8, Sharpcap, AS, RS 6, MagicLantern

  6. #5
    Altocumulus's Avatar
    Altocumulus is offline Bright Giants
    Points: 6,626, Level: 56
    Level completed: 38%, Points required for next Level: 124
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points200+ Posts Achievement!
    Join Date
    May 2016
    Location
    Scotland
    Posts
    578
    Points
    6,626
    Level
    56
    Thanks
    196
    Thanked 155x 123 Posts

    Default Re: How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser

    Sweet!

    I added a Pegasus motor on my LS60.
    Jeff DElia likes this.
    Geoff's the name - head's in the clouds
    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.
    130 retired injured, needs a new mirror.
    Lunt LS 60tha b1200/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    motorised focus/Lunt pressure unit - waiting for Spring.
    William Optics 102 GT/Lakeside motorised focus.
    Skywatcher Skymax 180 Pro/Pegasus motorised focus on OVL Crayford.
    EQ2 ; NEQ3 ; NEQ6 Pro.
    Lunt 1.25" Herschel Wedge on WO 102. NexImage5 ; ZWO ASI 120MM


  7. #6
    Mag95On's Avatar
    Mag95On is offline Bright Giants
    Points: 3,420, Level: 38
    Level completed: 47%, Points required for next Level: 80
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!
    Join Date
    Dec 2017
    Location
    Greater London
    Posts
    263
    Points
    3,420
    Level
    38
    Thanks
    406
    Thanked 61x 61 Posts

    Default Re: How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser

    Quote Originally Posted by Altocumulus View Post
    Sweet!

    I added a Pegasus motor on my LS60.
    I am using manual focus with a 2 inch crayford focuser. I find focusing not that easy. Not sure how much a motorised focuser would help. How do you know you are "in focus". What criteria do you use? The sun is hard to focus as its grey/monochrome and the laptop is not HDR high res screen with really good contrast. Focusing is not easy and not enjoyable on the Sun in white light or H-alpha ( Quark chromosphere).
    Thanks
    Magnus
    OTA: Altair Starwave 70ED F6, SW 150mm PDS // Mount:SW EQ3 Pro, Vixen polarie // Imaging: ASI120mm-S; Canon 100D, 7D, 6D, Samyang 14mm,85mm // Solar:Quark Chromosphere; Baader Solar filter //
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : CdC, GRIP, DSS, LR 6, Sequator, Adobe PSE 8, Sharpcap, AS, RS 6, MagicLantern

  8. #7
    Altocumulus's Avatar
    Altocumulus is offline Bright Giants
    Points: 6,626, Level: 56
    Level completed: 38%, Points required for next Level: 124
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points200+ Posts Achievement!
    Join Date
    May 2016
    Location
    Scotland
    Posts
    578
    Points
    6,626
    Level
    56
    Thanks
    196
    Thanked 155x 123 Posts

    Default Re: How I Motorized My Lunt LS50THa 1.25" Feather Touch Focuser

    Quote Originally Posted by Mag95On View Post
    I am using manual focus with a 2 inch crayford focuser. I find focusing not that easy. Not sure how much a motorised focuser would help. How do you know you are "in focus". What criteria do you use? The sun is hard to focus as its grey/monochrome and the laptop is not HDR high res screen with really good contrast. Focusing is not easy and not enjoyable on the Sun in white light or H-alpha ( Quark chromosphere).
    Thanks
    Assuming you're imaging.....

    It's definitely not easy - too many variables, many over which you have little control; i.e. the atmosphere (ours!).
    I find white light easier than Ha.

    Generally aim at a rim edge, adjusting the exposure and get focus as sharp as possible (I find the edge focus assistance in Sharpcap useful). You can, then see if anything on the disc can help tidy up the focus.
    Jeff DElia likes this.
    Geoff's the name - head's in the clouds
    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.
    130 retired injured, needs a new mirror.
    Lunt LS 60tha b1200/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    motorised focus/Lunt pressure unit - waiting for Spring.
    William Optics 102 GT/Lakeside motorised focus.
    Skywatcher Skymax 180 Pro/Pegasus motorised focus on OVL Crayford.
    EQ2 ; NEQ3 ; NEQ6 Pro.
    Lunt 1.25" Herschel Wedge on WO 102. NexImage5 ; ZWO ASI 120MM


  9. The Following User Says Thank You to Altocumulus For This Useful Post:

    Mag95On (04-01-2019)

 

 

Similar Threads

  1. Lunt releases Feather Touch focuser for LS50!
    By Ben Cartwright SASS in forum Solar Viewing Forum
    Replies: 6
    Last Post: 09-30-2016, 02:23 PM
  2. New Feather Touch/Micro Touch auto focuser
    By headdown in forum Refractor Telescopes Forum
    Replies: 2
    Last Post: 08-17-2014, 07:08 PM
  3. Replies: 6
    Last Post: 05-24-2014, 08:31 AM
  4. Issue with RoboFocus bracket on a Feather Touch 3" focuser
    By rpineau in forum Telescope Accessories Forum
    Replies: 0
    Last Post: 09-18-2013, 10:53 PM
  5. "Poor Man's" Feather Touch Focuser.
    By Astro-Cat in forum Astronomy Beginners Forum
    Replies: 20
    Last Post: 08-03-2013, 03:03 AM

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 10:49 PM.