Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1
    Carbone's Avatar
    Carbone is offline Junior Member
    Points: 7,159, Level: 59
    Level completed: 5%, Points required for next Level: 191
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!2 Posts Achievement1000 Days+ Registered Achievement!
    Join Date
    Mar 2009
    Location
    Czechia
    Posts
    1
    Points
    7,159
    Level
    59
    Thanks
    0
    Thanked 0x 0 Posts

    Default Which eyepiece for DIOPTRX?



    First of all, I'm new to this. I'm buying my first telescope (Orion SkyQuest XT8 Classic Dobsonian Telescope) and it comes with 25mm Sirius Plossl eyepiece.
    However, I have bad astigmatism (-3) and i'm considering buying TeleVue Dioptrx Astigmatism Correcting Lenses.
    Code:
    skiesunlimited.net/index.php?CategoryID=66
    
    Long Eye-Relief Tele Vue Eyepieces that Accept DIOPTRX™:
    Plössl - 55, 40, 32mm
    Radian - 18, 14, 12, 10, 8, 6, 5, 4, 3mm
    Panoptic - 41, 35, 27, 22mm
    Nagler Type 4 - 22, 17, 12mm
    Nagler Type 5 - 31, 26mm
    
    With adapters, Dioptrx now fit the 19mm and 24mm Panoptic as well as all TeleVue Type 6 Naglers. Also fits the 8mm and 13mm Ethos Eyepeices with no adapter.
    I figured out that it probably won't fit to the 25mm Sirius Plossl eyepiece.

    Questions:
    1) am I right?
    2) could I use some kind of adapter?
    3) if not which equivalent eyepiece is suitable for me?

    I certainly don't want to spend more than $100 and Tele Vue eyepieces seem to be pretty expensive.

    Thak you for your help.

  2. #2
    roverich's Avatar
    roverich is offline Moderator
    Points: 41,419, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Jan 2009
    Location
    virginia .usa
    Posts
    7,913
    Points
    41,419
    Level
    100
    Thanks
    2,009
    Thanked 1,963x 1,528 Posts

    Default

    Hi carbone , welcome aboard . I believe you can just focus the scope to your eyes . Unless you are using a camera in the eyepiece , i think this will work . Its like a big pair of glasses .
    16in Night sky
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    F4.5 , 90mm refractor 500mm FL , 7in
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
    If you cant stand behind the american soldier ,
    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.
    Please stand in front of one ...

  3. #3
    Vinnie's Avatar
    Vinnie is offline Guest
    Points: 24,260, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Sep 2008
    Location
    Queensland, Australia
    Posts
    3,474
    Points
    24,260
    Level
    100
    Thanks
    41
    Thanked 683x 362 Posts

    Default

    Hi carbone , welcome aboard . I believe you can just focus the scope to your eyes . Unless you are using a camera in the eyepiece , i think this will work . Its like a big pair of glasses .
    Rich that works for most eye problems, like near or far sight or just plain old age. Astigmatism is the big exception. A person with astigmatism is either stuck with wearing glasses while observing, or using a corrector like the Dioptrx.

    Carbone,

    Welcome to AF!

    I have done a lot of searches on this issues and as far as I can determine the Dioptrx only works with TeleVue eyepieces. Of course it might work with other brands but I can't find any info to suggest this.

    Otherwise you will need to get EPs with the longest Eye Relief that you can, 15mm at least, 20mm better, so that you can comfortably observe while wearing your glasses

  4. The Following User Says Thank You to Vinnie For This Useful Post:

    roverich (03-19-2009)

  5. #4
    roverich's Avatar
    roverich is offline Moderator
    Points: 41,419, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Jan 2009
    Location
    virginia .usa
    Posts
    7,913
    Points
    41,419
    Level
    100
    Thanks
    2,009
    Thanked 1,963x 1,528 Posts

    Default

    thanks for that vinnie , i did not know this .
    16in Night sky
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    F4.5 , 90mm refractor 500mm FL , 7in
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
    If you cant stand behind the american soldier ,
    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.
    Please stand in front of one ...

  6. #5
    Vinnie's Avatar
    Vinnie is offline Guest
    Points: 24,260, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Sep 2008
    Location
    Queensland, Australia
    Posts
    3,474
    Points
    24,260
    Level
    100
    Thanks
    41
    Thanked 683x 362 Posts

    Default

    Quote Originally Posted by roverich View Post
    thanks for that vinnie , i did not know this .
    Yeah, like thousands of us older guys I have glasses for reading, and a different script for the computer screen and working with my hands, and none needed for long distance.

    When observing the focus of the scope compensates for this no problem, but if someone else wants to look through the EP after I have focused they have to adjust the focus a little.

    What bugs me is that although I don't need to use my glasses at the EP, I can't read a chart or even the numbers on an EP without them so I always have a pair perched on my head that invariably end up on the ground (in the dark). Tried a cord around the neck but that invariably gets tangled around an EP or focuser knob or something.

    Ah the joys of getting old......

  7. #6
    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

    Hi Carbone,

    Welcome to Astronomy Forum.

  8. #7
    Live_Steam_Mad's Avatar
    Live_Steam_Mad is offline White Dwarf
    Points: 7,691, Level: 61
    Level completed: 47%, Points required for next Level: 159
    Overall activity: 0%
    Achievements:
    10 Days registered365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!
    Join Date
    Mar 2009
    Posts
    12
    Points
    7,691
    Level
    61
    Thanks
    0
    Thanked 2 Times in 1 Post

    Default

    Hi, there are quite a few other brands of eyepieces that fit the Dioptrx apart from Televue. 30mm GSO Superview , the Baader Hyperions , the Orion Stratus , and the 30 and 40mm Pentax XW (see Astromart astromart.com/articles/article.asp?article_id=612, some Axiom , they also fit Meade Series 4000 SWA and UWA eyepieces (I know of 1 person that has the dioptrx and finds that it fits their 8.8mm UWA and 32mm SWA ).

    Unfortunately like you I have -3.5 diopters of astigmatism in my left eye and -3 in my right eye. I am 35. My favourites are the Televue Radians as I can use them with reasonable comfort and still see all of the field, even with 1.5 index bog standard plastic lenses in my spectacles (ATM my spec's are an old prescription of -1.75 and -1.5, so thet're not too thick) I'm just waiting for my new spec's to be manufactured at present, the'll be ready on the 19th June, and this time I went for 1.6 High Index plastic lenses otherwise they will have to be quite a lot thicker this time round since my astigmatism has doubled in both eyes from 5 years ago. I always get Anti Reflective coatings (NOT just a hard coat, so you pay a little extra) on my spec's. Avoid polycarbonate lenses if you can since they are the worst for Chromatic Abberation since they have the lowest Abbe number (dispersion) (Abbe 58 for bog standard resin, 42 for High Index, approx, 28 for polycarbonate) unless you like seeing red and blue edges around the Moon!

    As soon as I get a mount for my C11 and Meade 7" Mak I will be acquiring the Dioptrx for my Radian.

    Because I have quite severe astigmatism (2 dioptres is moderate, 3.5 to 4 is severe, I have 3.5) I need glasses even with a 1mm or possibly smaller exit pupil, so I can just about never remove my glasses unless I use Dioptrx.

    Cheers,

    Alistair G.
    Last edited by Live_Steam_Mad; 06-08-2009 at 10:47 PM. Reason: added link, corrections

  9. The Following 2 Users Say Thank You to Live_Steam_Mad For This Useful Post:

    RussL (06-09-2009),Vinnie (06-08-2009)

  10. #8
    Vinnie's Avatar
    Vinnie is offline Guest
    Points: 24,260, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Sep 2008
    Location
    Queensland, Australia
    Posts
    3,474
    Points
    24,260
    Level
    100
    Thanks
    41
    Thanked 683x 362 Posts

    Default

    Thanks for that info Alistair. definitely worth filing for future reference

  11. #9
    Live_Steam_Mad's Avatar
    Live_Steam_Mad is offline White Dwarf
    Points: 7,691, Level: 61
    Level completed: 47%, Points required for next Level: 159
    Overall activity: 0%
    Achievements:
    10 Days registered365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!
    Join Date
    Mar 2009
    Posts
    12
    Points
    7,691
    Level
    61
    Thanks
    0
    Thanked 2 Times in 1 Post

    Default

    Another thought occurs along these lines, someone needs to ask Televue to bring out a pair of Astro Binoculars which have Dioptrx compatibility (does anyone know if there are any bino's on the market that are definitely Dioptrx compatible?). I would ask them but they have no e-mail address and I am in UK so can't really 'phone them. If someone in USA could 'phone Televue up and suggest this we would all be most grateful I suspect. Then finally we could all observe with binoculars without wearing our glasses!

    BTW I found the info. about other brands / models / focal lengths of eyepieces being compatible with Dioptrx by searching for several hours on Google!!

    Cheers,

    Alistair G.

  12. #10
    RussL's Avatar
    RussL is offline Guest
    Points: 15,907, Level: 87
    Level completed: 2%, Points required for next Level: 343
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Nov 2008
    Location
    Cayce, South Carolina
    Posts
    1,931
    Points
    15,907
    Level
    87
    Thanks
    220
    Thanked 353x 209 Posts

    Default

    Thanks to all for the info here. I've worn glasses for 50 years now. I have astigmatism, but I don't know the numbers. I can do without my glasses when observing, but usually leave them on. Back in the days before you could get wide-view eyepieces I developed this fancy way of taking them off and quickly rotating the stem in my hand so that the lenses layed back upside down on the back of my hand. That way, when changing eyepieces I could get a look fast before the object disappeared from the field of view. I'm still good at it, when needed with a short Plossl.

    I've worn my present pair for 8 years now and I'm beginning to really need new ones. The info about different types of plastic will come in handy when I go in this time. Thanks, Alistair.

    I must say that this time I'm worried about news of cataracts and glaucoma developing. Yep, Vin, it's fun getting old.

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Eyepiece or Eyepiece + Barlow?
    By kingmeow in forum Telescope Eyepieces Forum
    Replies: 7
    Last Post: 09-15-2010, 02:58 AM
  2. my eyepiece bag
    By sockswthsandals in forum Telescope Eyepieces Forum
    Replies: 12
    Last Post: 08-17-2010, 10:46 PM
  3. decent cost eyepiece for eyepiece projection?
    By Jon Ives in forum Amateur Astronomy Forum
    Replies: 1
    Last Post: 09-07-2009, 07:44 PM
  4. Which Eyepiece ....
    By Alex Vukasin in forum Amateur Astronomy Forum
    Replies: 3
    Last Post: 09-02-2003, 09:40 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 03:53 AM.