Results 1 to 5 of 5
  1. #1
    caheaton's Avatar
    caheaton is offline Bright Giants
    Points: 15,855, Level: 86
    Level completed: 88%, Points required for next Level: 45
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!365 Days+ Registered Achievement!First 1000 Experience Points100+ Threads Achievement!750 Days+ Registered Achievement!
    Join Date
    Jun 2009
    Location
    SW Ohio, USA
    Posts
    532
    Points
    15,855
    Level
    86
    Thanks
    18
    Thanked 254x 138 Posts

    Default Finder for an XT10 (F4.7)



    Hello, I recently ordered an XT10 and am now browsing around for a nice, wide finder EP. I've been spoiled by the 3.3 degree fields my ETX-80 gave me when used with the 26mm EP, so I'm looking for something that might get me close to that with the XT10 while still being inexpensive (I can't see spending much on an EP whose primary purpose is to be a finder (and the occasional wide, dark nebula)...distortions are okay...just aid me in getting on target ).

    So, after looking around here are some I'm considering:
    -- GSO Superview 50mm
    This one offers the widest FOV at about 2.5 degrees, but the whopping 10.6mm exit pupil will cause me to lose a lot of light; will the dimming be too detrimental to it's purpose?

    -- Owl Ultra Wide 30mm
    This one offers a 2 degree FOV and a more acceptable 6.3mm exit pupil (nearly perfect), but I think I might miss that extra half a degree.

    -- GSO Superview 42mm
    This one offers slightly oversized exit pupil of 8.9mm, but has a nice FOV at 2.28 degrees.

    -- Garrett Superwide 38mm
    This one also has a slightly oversized exit pupil of 8mm, but a nice FOV of 2.19 degrees.

    -- Meade 56mm Super Plossl
    This one also has a huge exit pupil of 11.9mm, but is very wide at 2.43 degrees, plus a simpler design.

    Given these choices and intended pupose, which would you go with?
    Craig
    Last edited by caheaton; 10-22-2009 at 04:58 PM.

  2. #2
    DigitalNinja's Avatar
    DigitalNinja is offline Bright Giants
    Points: 9,921, Level: 68
    Level completed: 91%, Points required for next Level: 29
    Overall activity: 0%
    Achievements:
    10 Days registered365 Days+ Registered Achievement!200+ Posts Achievement!Got three FriendsFirst 1000 Experience Points
    Join Date
    Mar 2009
    Location
    Halifax, Canada
    Posts
    474
    Points
    9,921
    Level
    68
    Thanks
    95
    Thanked 145x 95 Posts

    Default

    I'd go with something between 40 and 30mm. In my opinion anything above that you may as well just be using a finderscope or the like :P
    Also they light loss wont be as bad as a 50mm.

  3. #3
    WWPierre's Avatar
    WWPierre is offline HYPER GIANT
    Points: 64,445, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    10 Days registered3 Years + Achievement400+ Posts AchievementGhost Achievement! Averaging 5+ posts a day!1000 Days+ Registered Achievement!
    Join Date
    Jun 2009
    Location
    Squamish B.C.
    Posts
    6,948
    Points
    64,445
    Level
    100
    Thanks
    1,095
    Thanked 2,953x 1,808 Posts

    Default

    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

    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.

    We have been broadcasting our presence to the Universe for 100 years now. If there is a detachment of Galactic Pest Control within 100 light years, they are already on the way.

  4. #4
    DigitalNinja's Avatar
    DigitalNinja is offline Bright Giants
    Points: 9,921, Level: 68
    Level completed: 91%, Points required for next Level: 29
    Overall activity: 0%
    Achievements:
    10 Days registered365 Days+ Registered Achievement!200+ Posts Achievement!Got three FriendsFirst 1000 Experience Points
    Join Date
    Mar 2009
    Location
    Halifax, Canada
    Posts
    474
    Points
    9,921
    Level
    68
    Thanks
    95
    Thanked 145x 95 Posts

    Default

    that looks like a great eyepiece Now I wanna get one...

  5. #5
    caheaton's Avatar
    caheaton is offline Bright Giants
    Points: 15,855, Level: 86
    Level completed: 88%, Points required for next Level: 45
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!365 Days+ Registered Achievement!First 1000 Experience Points100+ Threads Achievement!750 Days+ Registered Achievement!
    Join Date
    Jun 2009
    Location
    SW Ohio, USA
    Posts
    532
    Points
    15,855
    Level
    86
    Thanks
    18
    Thanked 254x 138 Posts

    Default

    The Siebert looks interesting, but the FOV isn't as wide as I would like. I think I'll probably end up getting the Owl, as it has had mixed reviews (some people find the EP edge distortions acceptable in fast scopes, others can't stand them). Given that's it's primary role is as a finder (I expect the 26mm Meade or Orion 25mm Plossl to become my primary low power EP), I feel that I can live with the distortions. Plus, the exit pupil looks to be just about perfect, so no wasted aperture.

    I'll let the group know how the EP works out, but it may be awhile since I think I'm going to wait and just put it on my Christmas wish list
    Craig

 

 

Similar Threads

  1. Finder Scope versus Telrad/Celestron finder
    By pedalmasher in forum Celestron NexStar Telescope Forum
    Replies: 29
    Last Post: 05-10-2013, 09:20 PM
  2. Help with a XT10
    By AJinUT in forum Dobsonian Telescopes Forum
    Replies: 11
    Last Post: 12-02-2009, 09:58 PM
  3. Orion Skyquest XT10 Classic vs. XT10 Intelliscope
    By Jim Rainfordson in forum Amateur Astronomy Forum
    Replies: 9
    Last Post: 06-28-2008, 03:18 AM
  4. got my XT10!
    By Jay in forum Amateur Astronomy Forum
    Replies: 15
    Last Post: 10-26-2005, 10:58 AM
  5. GEM for an XT10
    By Joe Peterson in forum Amateur Astronomy Forum
    Replies: 4
    Last Post: 12-24-2004, 12:19 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 09:26 AM.