Results 1 to 5 of 5
  1. #1
    barkingspud's Avatar
    barkingspud is offline Main Sequence
    Points: 8,009, Level: 62
    Level completed: 53%, Points required for next Level: 141
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!2 Posts Achievement
    Join Date
    Mar 2009
    Location
    Batavia, IL
    Posts
    93
    Points
    8,009
    Level
    62
    Thanks
    12
    Thanked 25x 18 Posts

    Default OK, once again, FoV, Magnification and 2" Eyepieces



    I've read. And read, and read about 1.25" vs 2" eyepieces but have not been able to completely comprehend all of what I'm reading. I have a photographic background and completely understand most everything related to optics in the photographic world but am having some difficulty transferring it (completely) to the world of Telescopes.


    That said, there are hundreds of discussions related to the advantage and disadvantage of using 2" eyepieces. Thanks to Vinnie, I think I've figured out what question I am really asking here:

    Quote Originally Posted by Vinnie View Post

    snip

    The advantages of a 2" light train are not necessarily great in some ways. Its going to come down to the types of EP's that you may plan to use and the focal length of your scope.

    /snip
    You make a statement but don't actually explain how to determine the optimal eyepieces for a given scopes focal length and ratio.

    Quote Originally Posted by Vinnie View Post
    snip
    Examples are:

    If you want to use 100░ AFOV EPs then 17mm or longer will need to be 2" for maximum advantage, at 82░AFOV it is 20mm and at 68░AFOV 27mm will be the magic number.

    /snip
    Again, how did you derive these numbers?

    I'm not picking on you Vinnie, just trying to figure this stuff out at my level of comprehension.

    Cheers,

    Mark

  2. #2
    barkingspud's Avatar
    barkingspud is offline Main Sequence
    Points: 8,009, Level: 62
    Level completed: 53%, Points required for next Level: 141
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!2 Posts Achievement
    Join Date
    Mar 2009
    Location
    Batavia, IL
    Posts
    93
    Points
    8,009
    Level
    62
    Thanks
    12
    Thanked 25x 18 Posts

    Default

    I think I may have just answered my own question here. TeleVue has an excellent article and calculator for eyepiece selection.

    Tele Vue Optics Article Page

  3. #3
    star drop's Avatar
    star drop is offline Guilty as Charged
    Points: 14,490, Level: 82
    Level completed: 98%, Points required for next Level: 10
    Overall activity: 0%
    Achievements:
    10 Days registeredFirst 1000 Experience PointsGot three Friends20+ Friends Achievement!365 Days+ Registered Achievement!
    Join Date
    Nov 2008
    Location
    .
    Posts
    2,265
    Points
    14,490
    Level
    82
    Thanks
    11
    Thanked 475x 211 Posts

    Default

    Hello Mr. barkingspud.
    Have you noticed the sticky posts at the top of some of the forums?

  4. #4
    Nejedljf's Avatar
    Nejedljf is offline White Dwarf
    Points: 7,351, Level: 60
    Level completed: 1%, Points required for next Level: 199
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!2 Posts Achievement1000 Days+ Registered Achievement!
    Join Date
    Jul 2009
    Location
    Appleton, WI
    Posts
    26
    Points
    7,351
    Level
    60
    Thanks
    28
    Thanked 9x 4 Posts

    Default Televue calculator and articles

    I am also new and was suffering from the same problem of comprehension.

    Don't have time to read books or large articles? The best resource I have found is from the Tele Vue Website. You should go to the help/tutorial section and read "Choosing your telescopes magnification." Then go to the eyepiece section and read (at least) "Choosing your eyepieces".

    I am in no way suggesting you pay the big dollar for their eyepieces (although I am looking for used 12mm Nagler 4).

    Share your thoughts in forum even if they seem off base. It's the best way to get info.

  5. #5
    RLJSlick's Avatar
    RLJSlick is offline White Dwarf
    Points: 6,934, Level: 57
    Level completed: 92%, Points required for next Level: 16
    Overall activity: 0%
    Achievements:
    10 Days registered365 Days+ Registered Achievement!750 Days+ Registered Achievement!First 1000 Experience Points1000 Days+ Registered Achievement!
    Join Date
    Aug 2009
    Location
    Wisconsin USA
    Posts
    37
    Points
    6,934
    Level
    57
    Thanks
    0
    Thanked 7x 4 Posts

    Default

    This is a pretty good site also:
    A Short Guide to Choosing Eyepieces by Neil Paterson
    Ricky
    Meade LX200GPS 12" F10

  6. The Following 2 Users Say Thank You to RLJSlick For This Useful Post:

    DJnSoCal (08-08-2009),jpj802 (08-17-2009)

 

 

Similar Threads

  1. 2" vs 1.25" eyepieces for 8" CST ... worth the extra cost?
    By Rick S. in forum Telescope Eyepieces Forum
    Replies: 10
    Last Post: 08-26-2012, 01:15 AM
  2. Good eyepieces for 5"-8" Reflectors
    By Reflector? in forum Astronomy Beginners Forum
    Replies: 6
    Last Post: 02-08-2011, 10:36 PM
  3. "Primative" focusers and eyepieces?
    By BenM in forum ATM DIY Telescope Making Forum
    Replies: 3
    Last Post: 01-22-2011, 06:21 AM
  4. "Upgrading" power with eyepieces?
    By cmcfalls in forum Astronomy Beginners Forum
    Replies: 8
    Last Post: 01-29-2010, 06:13 PM
  5. 8" SCT focal ratio changes and magnification
    By Tenifer in forum Amateur Astronomy Forum
    Replies: 19
    Last Post: 11-13-2007, 05:16 AM

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 12:52 PM.