Results 1 to 9 of 9
Like Tree8Likes
  • 2 Post By Ozman13
  • 2 Post By Gabby76
  • 2 Post By Hamlet
  • 1 Post By Gabby76
  • 1 Post By Gabby76

Thread: How to collimate an achromatic refractor (Meade Adventure)

  1. #1
    Hamlet's Avatar
    Hamlet is offline White Dwarf
    Points: 139, Level: 2
    Level completed: 78%, Points required for next Level: 11
    Overall activity: 7.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Jun 2019
    Location
    Chile
    Posts
    13
    Points
    139
    Level
    2
    Thanks
    0
    Thanked 0x 0 Posts

    Default How to collimate an achromatic refractor (Meade Adventure)



    Hello, I'm about to have the meade Adventure 80mm, I read in the forum some things of collimation, and ... I do not know how to do it, I just need to screw and unscrew the three screws that are securing the focuser?

  2. #2
    Ozman13's Avatar
    Ozman13 is offline HYPER GIANT
    Points: 29,217, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 20.0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!365 Days+ Registered Achievement!50 Posts Achievement!
    Join Date
    Jun 2013
    Location
    Hopkinsville Kentucky
    Posts
    8,431
    Points
    29,217
    Level
    100
    Thanks
    170
    Thanked 2,238x 2,011 Posts

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    You will not necessarily need to collimate the scope. If you do the upgrades I spoke about, which includes removing the focuser, you can ensure that it is aligned (collimated) correctly to the objective (front lens) with the Cheshire I linked to. This is done with the small amount of play where the focuser attaches with three screws to the scope tube. You keep the screws slightly loose, just enough to allow the separate parts to move until the alignment is correct and tighten the screws down. The amount of movement possible is very minimal, but a small offset will affect the view.

    The scope you receive likely is correctly aligned, but possibly not. If left untouched, it likely doesn't need anything, but it COULD be slightly off from the beginning. If you remove the focuser, do the upgrades, and put the focuser back on, you likely are aligned well enough to get a good view. But you may put it back on at a very slight angle and the alignment is off. With the Cheshire, you know the alignment is correct and you tighten the screws down.
    Gabby76 and Hamlet like this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ACF 8"SCT,
    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.
    ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60,
    Oberwerk BT-82XL-ED, 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount
    Explore Scientific 82 degree and 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    &SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.

  3. #3
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 84,714, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 66.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Slovakia
    Posts
    19,555
    Points
    84,714
    Level
    100
    Thanks
    3,712
    Thanked 6,028x 5,064 Posts
    Blog Entries
    5

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    Using the three screws is only if the focuser is out of alignment with the tube/ lens.
    You can test this using a laser collimator or a crosshair eyepiece but I would not worry to much about it right away as it is usually quite hard to knock a refractor out of collimation unless you hit it hard or drop it.
    If the focuser is out of alignment you will see aberrations in the view, typically with these short tube refractors stars will look like little comets.

    The 80mm short tube does not have a collimatable lens cell just a retaining ring holding the lens in place.

    A Cheshire eyepiece for refractors: https://agenaastro.com/agena-1-25-co...efractors.html
    Ozman13 and Hamlet like this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / camera. - Gabrielle

    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  4. #4
    Hamlet's Avatar
    Hamlet is offline White Dwarf
    Points: 139, Level: 2
    Level completed: 78%, Points required for next Level: 11
    Overall activity: 7.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Jun 2019
    Location
    Chile
    Posts
    13
    Points
    139
    Level
    2
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    Ou! Thanks that's make me more clear about that!, I was a little confused
    Ozman13 and Gabby76 like this.

  5. #5
    Hamlet's Avatar
    Hamlet is offline White Dwarf
    Points: 139, Level: 2
    Level completed: 78%, Points required for next Level: 11
    Overall activity: 7.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Jun 2019
    Location
    Chile
    Posts
    13
    Points
    139
    Level
    2
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    Hi! Now i have my made and i feel it could be a little misaligned, when I look to a bright star in 20x it has a weird shape, not rounded or like a bright point. anyone has any pic if now it would look a bright star taken with a misaligned scope?

  6. #6
    Ozman13's Avatar
    Ozman13 is offline HYPER GIANT
    Points: 29,217, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 20.0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!365 Days+ Registered Achievement!50 Posts Achievement!
    Join Date
    Jun 2013
    Location
    Hopkinsville Kentucky
    Posts
    8,431
    Points
    29,217
    Level
    100
    Thanks
    170
    Thanked 2,238x 2,011 Posts

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    Quote Originally Posted by Hamlet View Post
    Hi! Now i have my made and i feel it could be a little misaligned, when I look to a bright star in 20x it has a weird shape, not rounded or like a bright point. anyone has any pic if now it would look a bright star taken with a misaligned scope?
    If the star is very bright, you may be noticing the chromatic aberration that all achromatic refractors have. If you have a moon filter, use that and look at the bright star. If it is still odd shaped, the collimation may be off.

    Alternately, if your scope came with a cap for the objective that has a small hole in it, leave the cap on and remove the smaller cap that covers the small hole (this is called stopping the scope down and reduces the aperture) and look at the bright star through the smaller aperture. Or you can easily make your own aperture mask to let in less light, a 40mm opening will work fine for this. If the star is still odd shaped when the aperture is reduced, it likely needs collimating.

    What do slightly dimmer stars look like? If they too are odd shaped, the scope is out of collimation.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ACF 8"SCT,
    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.
    ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60,
    Oberwerk BT-82XL-ED, 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount
    Explore Scientific 82 degree and 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    &SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.

  7. #7
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 84,714, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 66.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Slovakia
    Posts
    19,555
    Points
    84,714
    Level
    100
    Thanks
    3,712
    Thanked 6,028x 5,064 Posts
    Blog Entries
    5

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    As well where is the strangely shaped star located in the field of view?
    What star were you viewing/ how high up in the sky?
    What were the sky conditions, was the telescope acclimated yet?

    At only 20x magnification there could be a few reasons including the eyepiece itself.
    Ozman13 likes this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / camera. - Gabrielle

    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  8. #8
    Hamlet's Avatar
    Hamlet is offline White Dwarf
    Points: 139, Level: 2
    Level completed: 78%, Points required for next Level: 11
    Overall activity: 7.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Jun 2019
    Location
    Chile
    Posts
    13
    Points
    139
    Level
    2
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    Well... I was looking Júpiter indeed, But that was 3 days ago, i need to check the view again, so i would explain better, But with the hole cap and a 66X, jupiter looks so nice!....

  9. #9
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 84,714, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 66.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Slovakia
    Posts
    19,555
    Points
    84,714
    Level
    100
    Thanks
    3,712
    Thanked 6,028x 5,064 Posts
    Blog Entries
    5

    Default Re: How to collimate an achromatic refractor (Meade Adventure)

    If Jupiter is looking good I would just view with it for a while and see how it works.
    Set the telescope up about 15 minutes or so before you start to view (eyepieces and diagonal as well)
    Jupiter is fairly low at the moment so if it is looking reasonable there is most likely nothing serious wrong.
    Ozman13 likes this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / camera. - Gabrielle

    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

 

 

Similar Threads

  1. Review: Meade Adventure Scope 80mm refractor
    By starlogborg in forum Meade Telescope Forums
    Replies: 18
    Last Post: 06-26-2019, 10:45 PM
  2. Replies: 4
    Last Post: 01-08-2019, 09:34 PM
  3. Wanted: ES 102mm Achromatic Doublet Refractor
    By localhost in forum Astronomy Classifieds
    Replies: 1
    Last Post: 04-19-2017, 01:10 AM
  4. Is this an achromatic refractor?
    By Lensgrinder in forum Refractor Telescopes Forum
    Replies: 5
    Last Post: 05-14-2013, 02:24 PM
  5. Meade LXD55 6" Achromatic Refractor
    By Nate Pitcher in forum General Astronomy Forum
    Replies: 2
    Last Post: 09-06-2003, 08:08 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 12:36 AM.