Results 1 to 3 of 3
Like Tree7Likes
  • 1 Post By Smonohan
  • 6 Post By j.gardavsky

Thread: Ok...I did something stupid. Which way does the EP glass go?

  1. #1
    Cosmos63's Avatar
    Cosmos63 is offline HYPER GIANT
    Points: 15,437, Level: 85
    Level completed: 68%, Points required for next Level: 113
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Monthly Activity Achievement!
    Join Date
    Dec 2015
    Location
    Stuttgart AR
    Posts
    1,919
    Points
    15,437
    Level
    85
    Thanks
    102
    Thanked 462x 324 Posts

    Default Ok...I did something stupid. Which way does the EP glass go?



    Ever have one of those "Why did I do that?" moments. I just did and a lesson was learned here. Where's the "I'm embarrased" or "I'm an idiot" smilie?

    Messing around with my eyepieces, noticed one assembly was loose and unscrewed it to look for some stupid reason. When the barrel came apart, a lens fell out. Any idea which way it goes back into the barrel as represented by pic 1 and 2? I've tried both ways and looked through it out the window but don't see any obvious difference. This your typical basic Celestron 15mm.

    Attachment 125241Attachment 125242
    Jim
    Meade ETX80 and 90, Celestron Omni 150XLT, Sky-Watcher 8" Collapsible Dob, Orion ST80, Celestron 6SE, Coronado PST, Celestron SE, SLT and iOptron EQ Pro go-to mounts, Orion Astroview EQ mount.
    I do not trust any person that has a dislike for dogs - I have complete trust in a dog having a dislike for any person.

  2. #2
    Smonohan's Avatar
    Smonohan is offline SUPER GIANT
    Points: 4,938, Level: 47
    Level completed: 94%, Points required for next Level: 12
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Jul 2014
    Location
    Plano, TX
    Posts
    791
    Points
    4,938
    Level
    47
    Thanks
    115
    Thanked 177x 154 Posts

    Default Re: Ok...I did something stupid. Which way does the EP glass go?

    I am guessing the curved side would face the field lens or field stop (away from your eye). For me, this intuitively focuses the light to a point in front of your eye while the other way would disperse the light.

    Just my uneducated opinion though. Others more qualified should chime in.
    j.gardavsky likes this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    XT10 and 20x80 Binos
    ES 68 deg. 28mm, 20mm & 16mm w/2X focal extender
    ES 70 deg 25mm & Celestron 8-24mm Zoom lens
    DGM NPB, OIII, VHT & GCE Filters 1.25"
    Canon T5 W/ES 18-55 and 75-300 mm lens

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Smart EQ Mount
    Amateur Radio Station - KG5JBY

  3. The Following User Says Thank You to Smonohan For This Useful Post:

    Cosmos63 (01-16-2016)

  4. #3
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 111,912, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 34.0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,419
    Points
    111,912
    Level
    100
    Thanks
    14,422
    Thanked 8,798x 5,726 Posts

    Default Re: Ok...I did something stupid. Which way does the EP glass go?

    Hello Jim,

    don't worry, if it is a Plössl, it looks like it is.

    Open the link, and go to Fig.213 Telescope eyepiece 2
    It shows the optics design of some eyepices, including the Plössls.
    Now, you can see that the Plössl has two cemented doublets, symmetrically placed to each other, and that the nearly flat concave surface looks out of the eyepiece.
    And here you are, how to place the lens back into the barell.

    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  5. The Following 3 Users Say Thank You to j.gardavsky For This Useful Post:

    Cosmos63 (01-16-2016),MoosBros (01-19-2016),Smonohan (01-16-2016)

 

 

Similar Threads

  1. Replies: 7
    Last Post: 07-29-2015, 07:20 PM
  2. ED glass
    By photographer in forum Astronomy Beginners Forum
    Replies: 2
    Last Post: 02-28-2012, 12:52 PM
  3. What is ED glass?
    By TMA in forum Amateur Astronomy Forum
    Replies: 52
    Last Post: 12-16-2004, 07:44 PM
  4. stupid woman writes stupid article
    By Allison Kirkpatrick in forum Amateur Astronomy Forum
    Replies: 82
    Last Post: 08-19-2004, 11:28 AM
  5. There Are No Stupid Questions, Only Stupid People...
    By Ed O'Neill in forum Amateur Astronomy Forum
    Replies: 1
    Last Post: 08-28-2003, 01:01 PM

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 04:57 PM.