Page 1 of 2 12 LastLast
Results 1 to 10 of 17
  1. #1
    capchap's Avatar
    capchap is offline Bright Giants
    Points: 2,183, Level: 29
    Level completed: 83%, Points required for next Level: 17
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!First 1000 Experience Points
    Join Date
    Feb 2012
    Location
    Ocala, Florida
    Posts
    307
    Points
    2,183
    Level
    29
    Thanks
    48
    Thanked 21x 20 Posts

    Default Collumation vs alignment



    Hi All,
    Since "Bob's Knobs" are on their way, and collumation doesn't seem that difficult...

    I am thinking about getting a reticule EP.
    I suspect/expect that it will help with both collumation (Since I should be able to see the defocused star relative to center axis

    AND

    I am thinking it will help me with aligning my spotter scop with my OTA

    AS WELL AS

    Help me more precisely do my initial polar alignment.

    Thoughts please.
    Don
    Meade LX200 8" F10/wedge, 4000 series flip mirror, LP and DS imagers, Criterion 6" Dynascope. Moon and color filter set, 18mmSWA, 6.7UWA, 2x apochromatic barlow, 2" celestron e-lux 40mm, 8.4-21 zoom original criterion 7mm, 9mm, and 18mm eyepiece. Canon EOS-1Ds, Rebel XT, T-ring 1.25" and 2" adapter.

  2. #2
    Gadget63's Avatar
    Gadget63 is offline SUPER GIANT
    Points: 11,551, Level: 74
    Level completed: 34%, Points required for next Level: 199
    Overall activity: 0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement
    Join Date
    Jan 2012
    Location
    Fair Play, SC, or wherever our RV takes us
    Posts
    904
    Points
    11,551
    Level
    74
    Thanks
    100
    Thanked 166x 144 Posts

    Default

    I bought an illuminated eyepiece and it was one of my better investments! It saves me so much time and I get precise alignments with it.....

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8 SE, Heavy Duty EQ Wedge, Celestron 8mm-24mm zoom
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron eyepiece/filter accessory kit, Celestron power tank, Telrad, Nikon D80
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    camera with T-adapter and
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron 80mm guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron Neximage, Celestron Nexguide, Celestron CGEM-DX EQ mount!

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

  3. #3
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    For alignments -- Yes. For collimation -- no.

    Clear skies.
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    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.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

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

  4. #4
    capchap's Avatar
    capchap is offline Bright Giants
    Points: 2,183, Level: 29
    Level completed: 83%, Points required for next Level: 17
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!First 1000 Experience Points
    Join Date
    Feb 2012
    Location
    Ocala, Florida
    Posts
    307
    Points
    2,183
    Level
    29
    Thanks
    48
    Thanked 21x 20 Posts

    Default

    which one did you buy?
    I really only see one brand available Meade
    I am thinking about the 12mm plossl, but I am concerned about the movable part and no recentering capablilty...seems kind-of worthless without accurate recentering.

    Another options are the 12mm MA and 9mm MA, both corded (for my meade LX200 scope, or cordless (batteries).

    I like the double cross and concentric circles of the plossl. Sure wish i could find one fixed.

    I also saw one that had five or six different markings. not sure what they are for though.
    Meade LX200 8" F10/wedge, 4000 series flip mirror, LP and DS imagers, Criterion 6" Dynascope. Moon and color filter set, 18mmSWA, 6.7UWA, 2x apochromatic barlow, 2" celestron e-lux 40mm, 8.4-21 zoom original criterion 7mm, 9mm, and 18mm eyepiece. Canon EOS-1Ds, Rebel XT, T-ring 1.25" and 2" adapter.

  5. #5
    Gadget63's Avatar
    Gadget63 is offline SUPER GIANT
    Points: 11,551, Level: 74
    Level completed: 34%, Points required for next Level: 199
    Overall activity: 0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement
    Join Date
    Jan 2012
    Location
    Fair Play, SC, or wherever our RV takes us
    Posts
    904
    Points
    11,551
    Level
    74
    Thanks
    100
    Thanked 166x 144 Posts

    Default

    i have the orion 12mm illuminated recticle. it has the double crosshairs and seems to work great for me.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8 SE, Heavy Duty EQ Wedge, Celestron 8mm-24mm zoom
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron eyepiece/filter accessory kit, Celestron power tank, Telrad, Nikon D80
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    camera with T-adapter and
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron 80mm guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron Neximage, Celestron Nexguide, Celestron CGEM-DX EQ mount!

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

  6. #6
    capchap's Avatar
    capchap is offline Bright Giants
    Points: 2,183, Level: 29
    Level completed: 83%, Points required for next Level: 17
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!First 1000 Experience Points
    Join Date
    Feb 2012
    Location
    Ocala, Florida
    Posts
    307
    Points
    2,183
    Level
    29
    Thanks
    48
    Thanked 21x 20 Posts

    Default

    Why not for collimation?
    I read an article that described using masking tape to mark one of the screws (Imaginary 12 o'clock) to form a shadow and then draw an imaginary line and adjust the defocused star toward center.

    I'm thinking a real line would be easier to work with.
    Meade LX200 8" F10/wedge, 4000 series flip mirror, LP and DS imagers, Criterion 6" Dynascope. Moon and color filter set, 18mmSWA, 6.7UWA, 2x apochromatic barlow, 2" celestron e-lux 40mm, 8.4-21 zoom original criterion 7mm, 9mm, and 18mm eyepiece. Canon EOS-1Ds, Rebel XT, T-ring 1.25" and 2" adapter.

  7. #7
    capchap's Avatar
    capchap is offline Bright Giants
    Points: 2,183, Level: 29
    Level completed: 83%, Points required for next Level: 17
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!First 1000 Experience Points
    Join Date
    Feb 2012
    Location
    Ocala, Florida
    Posts
    307
    Points
    2,183
    Level
    29
    Thanks
    48
    Thanked 21x 20 Posts

    Default

    I was just looking at
    Meade 12mm MA astrometric with illuminator
    it's the one I saw earlier with more than one scale.

    would this be useful? I hate buying 'single-taskers' ...learned from Alton Brown.
    Meade LX200 8" F10/wedge, 4000 series flip mirror, LP and DS imagers, Criterion 6" Dynascope. Moon and color filter set, 18mmSWA, 6.7UWA, 2x apochromatic barlow, 2" celestron e-lux 40mm, 8.4-21 zoom original criterion 7mm, 9mm, and 18mm eyepiece. Canon EOS-1Ds, Rebel XT, T-ring 1.25" and 2" adapter.

  8. #8
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    Because you collimate an SCT on a star in two steps-- first with a big doughnut de-focused star -- then you jump the magnification up and just barely defocus the star and watch if the tiny shadow of the secondary remains in the middle on both sides of focus.... and make tiny tweaks of the collimation screws (or Bob's Knob screws) -- to make it stay in the middle as best you can.

    Masking tape or lighted crosshairs not needed.

    On your reflector a laser with a return beam screen will work just fine-- add a barlow if you want to be extra precise.

    http://www.smartavtweaks.com/RVBL.html
    Last edited by Joe Lalumia; 03-05-2012 at 04:57 AM.
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    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.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

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

  9. #9
    deaman49's Avatar
    deaman49 is offline HYPER GIANT
    Points: 18,723, Level: 94
    Level completed: 56%, Points required for next Level: 177
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!400+ Posts AchievementGhost Achievement! Averaging 5+ posts a day!First 1000 Experience PointsGot three Friends
    Join Date
    Apr 2011
    Location
    Allegany, New York
    Posts
    4,228
    Points
    18,723
    Level
    94
    Thanks
    1,522
    Thanked 866x 775 Posts

    Default

    What Joe said. A Cheshire is good too.
    Lee

    Zhumell Z10 DOB.
    Forgive my stupidity, it's hereditary!
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    If ignorance is Bliss, then I'm BLISTERED!
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    I make mistakes, so others don't have too!
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  10. #10
    Bob327's Avatar
    Bob327 is offline HYPER GIANT
    Points: 41,366, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    10 Days registered200+ Posts Achievement!First 1000 Experience PointsGot three Friends365 Days+ Registered Achievement!
    Join Date
    Sep 2009
    Location
    Frederick Maryland
    Posts
    9,247
    Points
    41,366
    Level
    100
    Thanks
    19
    Thanked 4,039x 3,068 Posts

    Default

    Joe is correct an illuminated eyepiece will be of no help when collimating and to be honest not much of a help (if any) when aligning...just defocusing the star so it appears like a big fat donut in the eyepiece makes centering a star a piece of cake...

    Compare centering a pancake on a dinner plate against centering a grape on the same plate...

    Bob G.
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

  11. The Following User Says Thank You to Bob327 For This Useful Post:

    star2root (03-05-2012)

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Help with alignment...
    By BenBoosted in forum Celestron NexStar Telescope Forum
    Replies: 9
    Last Post: 01-04-2012, 03:48 PM
  2. Polar alignment/R.A. alignment
    By WalterK in forum Astronomy Beginners Forum
    Replies: 10
    Last Post: 12-06-2011, 02:00 PM
  3. Little help with alignment
    By Bradley H in forum Telescope Mounts Forum
    Replies: 4
    Last Post: 07-04-2011, 10:58 AM
  4. etx-125 alignment
    By mattodell in forum Astronomy Beginners Forum
    Replies: 1
    Last Post: 02-26-2009, 04:56 PM
  5. GPS Alignment
    By Magician's Apprentice in forum General Astronomy Forum
    Replies: 1
    Last Post: 07-04-2004, 09:29 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 01:28 PM.