Results 1 to 6 of 6
Like Tree1Likes
  • 1 Post By Alpha Tauri

Thread: Eyepiece for a Scope

  1. #1
    EyeLostMyMind's Avatar
    EyeLostMyMind is offline White Dwarf
    Points: 292, Level: 5
    Level completed: 84%, Points required for next Level: 8
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!
    Join Date
    Nov 2012
    Location
    Southwest Texas
    Posts
    33
    Points
    292
    Level
    5
    Thanks
    10
    Thanked 0x 0 Posts

    Question Eyepiece for a Scope



    Hi my name is Ray and i am new to this ... i jumped in with both feet and no life jacket .. i purchased a 60mm lense and frankensteined a telescope out of it .. worked pretty good i might say considering i don't know what i was doing ... i started with a piece of pvc pipe about 36 inches long .. no focus point .. so i cut some off until i was able to focus in the moon .. i saw craters and it was awesome ... don't know what i have but it was cool to be able to do it myself ....

    I recently purchased a Meade 4.5 inch F4 telescope spherical mirror kit with secondary and holders 4.5" it states that The mirror cell and spider are made to attach to a 5.25" outside diameter tube. so i am thinking that if i get a pvc pipe that is 5 1/4 inches . i can attach that to it .. now the question is what kind of eyepiece can i get or should i get to be able to use this .. i have no problem stepping my self down to get the focus down.

    BTW is there another way to determine how to figure out the focal length with just the primary and secondary mirrors?

    Thanks in advance for you help

    Ray

  2. #2
    Alpha Tauri's Avatar
    Alpha Tauri is offline HYPER GIANT
    Points: 13,580, Level: 80
    Level completed: 38%, Points required for next Level: 220
    Overall activity: 1.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three Friends
    Join Date
    Sep 2012
    Location
    Indianapolis
    Posts
    1,988
    Points
    13,580
    Level
    80
    Thanks
    137
    Thanked 551x 458 Posts

    Default Re: Eyepiece for a Scope

    If your good at algebra, this link should provide ALL specs for your home made scope:
    Welcome to the SaharaSky Observatory

    Here is a handy calculator if you don't feel up to doing the math.
    Telescope Optics Formulas with Calculators
    j.gardavsky likes this.
    ~Charlie~
    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.
    , Jason
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    200, Jason 10x50's, Celestron 15x70's
    "Each star is a mirror, reflecting the truth inside of you."

  3. The Following 2 Users Say Thank You to Alpha Tauri For This Useful Post:

    EyeLostMyMind (12-04-2012),j.gardavsky (12-04-2012)

  4. #3
    EyeLostMyMind's Avatar
    EyeLostMyMind is offline White Dwarf
    Points: 292, Level: 5
    Level completed: 84%, Points required for next Level: 8
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!
    Join Date
    Nov 2012
    Location
    Southwest Texas
    Posts
    33
    Points
    292
    Level
    5
    Thanks
    10
    Thanked 0x 0 Posts

    Default Re: Eyepiece for a Scope

    The thing that makes the eyepiece go up and down to get it into focus ... where might i find one and what kind should i get for this particular set up ?????

    Thanks for you prompt response ....

    Ray

  5. #4
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 174,319, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 66.0%
    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
    25,256
    Points
    174,319
    Level
    100
    Thanks
    6,661
    Thanked 14,995x 9,550 Posts
    Blog Entries
    3

    Default Re: Eyepiece for a Scope

    Quote Originally Posted by EyeLostMyMind View Post
    I recently purchased a Meade 4.5 inch F4 telescope

    ...

    BTW is there another way to determine how to figure out the focal length with just the primary and secondary mirrors?
    Focal length is aperture x focal ratio. 4.5" x 4 = 18"

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

  6. #5
    skaven's Avatar
    skaven is offline HYPER GIANT
    Points: 39,671, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!First 1000 Experience Points5+ Referrals Achievement!
    Join Date
    Dec 2011
    Location
    San Diego
    Posts
    2,697
    Points
    39,671
    Level
    100
    Thanks
    180
    Thanked 1,927x 966 Posts

    Default Re: Eyepiece for a Scope

    You might also want to check this out for calculating the dimensions of your scope: Newt for the Web

    As for focusers, for a 4" f/4 I'd suggest a crayford style like this one: GSO Crayford Focuser for Reflectors - Single Speed Really a 1.25" focuser would be sufficient, but if you go ahead and get a 2" focuser, you can use it on a larger scope if you decide to build one later. It also allows you to use 2" widefield eyepieces.

    Finally, for eyepieces, you probably would get some good mileage out of a kit like this one: Meade Series 4000 Eyepiece & Filter Set Telescope accessory kit

    Since you clearly like to experiment, this would give you a wide range of eyepieces to try. Note that your f/4 will likely exhibit a fair amount of spherical aberration and coma at the edges of the field. You can mitigate the effects of this to some degree with high-end eyepieces, but it sounds to me like you're more interested in tinkering with some stuff that isn't too expensive for the time being.

    If $200 for a full eyepiece kit is a bit to spendy for the moment, I suggest you pick up a few GSO Plossls at the following focal lengths:

    • 4mm: maximum magnification (1mm exit pupil) (note the eye relief on this will be really uncomfortable)
    • 9mm: optimum magnification for DSO observation (~2mm exit pupil)
    • 15mm: midrange magnifcation (3.75mm exit pupil)
    • 25mm: low magnification (6.25mm exit pupil)


    All four of these eyepieces are available for under $40 each here: 1.25" Eyepieces - Eyepieces

    As you can see, the kit (which contains these eyepieces, and more) is about the same price as buying all four of the GSO eyepieces individually.

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

    C10-N/C14+Losmandy G11; Portaball 12.5"; NexStar 6SE; Meade ETX125; Stellarvue F80
    Meade HD-60 9mm, 6.5mm; 56mm; University Optics Orthoscopic 12.5mm, 9mm, 7mm, 5mm;
    ES 70° 15mm, 20mm; ES 82° 30mm, 18mm; ES 100° 9mm; Baader Hyperion 24mm; TV Nagler T6 13mm
    William Optics Binoviewer; GSO 2" 2x ED barlow; 5x APO barlow, Parks 2.5x APO barlow
    Filters: Orion Ultrablock, Thousand Oaks OIII

  7. The Following User Says Thank You to skaven For This Useful Post:

    EyeLostMyMind (12-05-2012)

  8. #6
    EyeLostMyMind's Avatar
    EyeLostMyMind is offline White Dwarf
    Points: 292, Level: 5
    Level completed: 84%, Points required for next Level: 8
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!
    Join Date
    Nov 2012
    Location
    Southwest Texas
    Posts
    33
    Points
    292
    Level
    5
    Thanks
    10
    Thanked 0x 0 Posts

    Default Re: Eyepiece for a Scope

    Thank you for that info ... the website only had a focuser for a 6" 8/10" ... would i be able to use a 6" for a 4.5 inch mirror ????

 

 

Similar Threads

  1. Best eyepiece for my scope?
    By MikeTheMechanic in forum Telescope Eyepieces Forum
    Replies: 10
    Last Post: 04-07-2011, 05:47 PM
  2. Eyepiece or scope?
    By Dark Canvas in forum Reflector Telescope Forum
    Replies: 5
    Last Post: 09-13-2010, 01:09 AM
  3. Eyepiece at the top of the scope
    By scyntax in forum Astronomy Beginners Forum
    Replies: 11
    Last Post: 06-02-2010, 08:13 PM
  4. If you could only have one eyepiece for your scope what would it be?
    By HeXploiT in forum Telescope Eyepieces Forum
    Replies: 29
    Last Post: 04-27-2010, 04:26 PM
  5. Scope Eyepiece
    By Howard in forum UK Astronomy Forum
    Replies: 1
    Last Post: 02-08-2005, 04:14 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 06:28 PM.