Page 1 of 2 12 LastLast
Results 1 to 10 of 18
Like Tree19Likes

Thread: Thinking about a new EP, and not sure

  1. #1
    Doug James's Avatar
    Doug James is offline Bronze Supporter
    Points: 8,099, Level: 62
    Level completed: 83%, Points required for next Level: 51
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!
    Join Date
    Nov 2011
    Location
    Whiteshell Lake, Mb. Canada
    Posts
    291
    Points
    8,099
    Level
    62
    Thanks
    135
    Thanked 52x 37 Posts

    Default Thinking about a new EP, and not sure



    I have some Orion Stratus EP's and am thinking of 5MM Stratus for use with my Celestron Omni XLT 120,f/8.33 Refractor.
    My question is will that max it out so it ends up being used only on the odd very clear night? The 8mm works Great so was thinking Maybe go for a little more.
    Last edited by Gabby76; 12-18-2018 at 12:35 AM. Reason: Fixed message context :)
    Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
    Shorty 2x Barlow lens, Orion Stratus 8mm,13mm,21mm, Baader 36mm, Meade 6.5mm,
    Binoculars, Nikon 10x50

  2. #2
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 173,431, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 97.0%
    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
    25,191
    Points
    173,431
    Level
    100
    Thanks
    6,660
    Thanked 14,988x 9,544 Posts
    Blog Entries
    3

    Default re: Thinking about a new EP, and not sure

    In average conditions, the maximum magnification you can realistically use will be 8.33mm. (Easy formula: the eyepiece focal length is equal to the scope's focal ratio.) You will likely get some use out of the 5mm, but you will only be happy with the view in excellent conditions. One exception is the Moon: the 5mm will probably be fine on the Moon.

    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.

  3. #3
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 84,412, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 79.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Slovakia
    Posts
    19,551
    Points
    84,412
    Level
    100
    Thanks
    3,712
    Thanked 6,028x 5,064 Posts
    Blog Entries
    5

    Default re: Thinking about a new EP, and not sure

    You mean EPs?
    You can enter all of your numbers into here and it will let you know if it is within usable range of your telescope. N.A.A. Telescope Math Calculator
    The 5mm will work for a lunar/ double star eyepiece quite well.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  4. #4
    Doug James's Avatar
    Doug James is offline Bronze Supporter
    Points: 8,099, Level: 62
    Level completed: 83%, Points required for next Level: 51
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!
    Join Date
    Nov 2011
    Location
    Whiteshell Lake, Mb. Canada
    Posts
    291
    Points
    8,099
    Level
    62
    Thanks
    135
    Thanked 52x 37 Posts

    Default Re: Thinking about a new EP, and not sure

    LOL yes EP's
    Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
    Shorty 2x Barlow lens, Orion Stratus 8mm,13mm,21mm, Baader 36mm, Meade 6.5mm,
    Binoculars, Nikon 10x50

  5. #5
    Bigzmey's Avatar
    Bigzmey is offline HYPER GIANT
    Points: 40,753, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 59.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Sep 2015
    Location
    Planet Earth
    Posts
    7,545
    Points
    40,753
    Level
    100
    Thanks
    1,801
    Thanked 3,185x 2,291 Posts

    Default Re: Thinking about a new EP, and not sure

    What ladies say. Seeing permitting, 5mm EP will be useful for Moon, planets and doubles.

  6. The Following User Says Thank You to Bigzmey For This Useful Post:

    Doug James (12-18-2018)

  7. #6
    Ozman13's Avatar
    Ozman13 is offline HYPER GIANT
    Points: 29,217, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 20.0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!365 Days+ Registered Achievement!50 Posts Achievement!
    Join Date
    Jun 2013
    Location
    Hopkinsville Kentucky
    Posts
    8,431
    Points
    29,217
    Level
    100
    Thanks
    170
    Thanked 2,238x 2,011 Posts

    Default Re: Thinking about a new EP, and not sure

    Personally, I would be more interested in a 6mm. It would match well with your f/6 Dob for high power and be useful more often in the refractor than a 5mm.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ACF 8"SCT,
    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.
    120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60,
    Oberwerk BT-82XL-ED, 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount
    Explore Scientific 82 degree and 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader Moon&SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.

  8. #7
    Don Alvarez's Avatar
    Don Alvarez is offline Bright Giants
    Points: 9,392, Level: 67
    Level completed: 14%, Points required for next Level: 258
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Mar 2017
    Location
    Coral Springs, Florida
    Posts
    1,550
    Points
    9,392
    Level
    67
    Thanks
    168
    Thanked 384x 284 Posts

    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Ozman13 View Post
    Personally, I would be more interested in a 6mm. It would match well with your f/6 Dob for high power and be useful more often in the refractor than a 5mm.
    Or go for the middle ground between 5mm and 6mm

    https://www.bhphotovideo.com/c/produ...BI%3A514&smp=Y
    Intrepid and Bigzmey like this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    10" SkyLine
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron Nextar GT90, Meade Infinity 80
    EP: The Five Fingers of Doom: 5.5mm, 8.8mm, 14mm, 20mm, 24mm Meade 5000 UWA's
    20mm, 26mm, 32mm, 40mm Meade 4000 Plossls, 30mm, 20mm, 15mm GSO Superview,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Expanse, Baader Classic Orthos, Various others.
    Binocs: 15x70 Celestron Skymaster, 10x50 Levenhuk Karma Pro, 10x42 Bushnell, 8x42 Sans & Streiffe

    Member, South Florida Amateur Astronomers Association

  9. #8
    jcj380's Avatar
    jcj380 is offline Bright Giants
    Points: 3,080, Level: 36
    Level completed: 20%, Points required for next Level: 120
    Overall activity: 36.0%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!
    Join Date
    Jun 2017
    Location
    Western 'burbs of Chicago
    Posts
    425
    Points
    3,080
    Level
    36
    Thanks
    16
    Thanked 136x 76 Posts

    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Gabby76 View Post
    N.A.A. Telescope Math Calculator
    LOL. My club is famous.
    j.gardavsky and Doug James like this.

    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.
    ST120 refractor, vintage Celestron C-8
    Mounts: ES Twilight 1, Celestron EQ fork with pod and wedge

  10. #9
    Doug James's Avatar
    Doug James is offline Bronze Supporter
    Points: 8,099, Level: 62
    Level completed: 83%, Points required for next Level: 51
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!
    Join Date
    Nov 2011
    Location
    Whiteshell Lake, Mb. Canada
    Posts
    291
    Points
    8,099
    Level
    62
    Thanks
    135
    Thanked 52x 37 Posts

    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Don Alvarez View Post
    Or go for the middle ground between 5mm and 6mm

    https://www.bhphotovideo.com/c/produ...BI%3A514&smp=Y
    It sure looks good with 82° field of view, and priced where I want to be as well. Do you not think it's drawing a fine line between workable and unworkable with the Omni XLT 120 ?
    Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
    Shorty 2x Barlow lens, Orion Stratus 8mm,13mm,21mm, Baader 36mm, Meade 6.5mm,
    Binoculars, Nikon 10x50

  11. #10
    Bigzmey's Avatar
    Bigzmey is offline HYPER GIANT
    Points: 40,753, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 59.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Sep 2015
    Location
    Planet Earth
    Posts
    7,545
    Points
    40,753
    Level
    100
    Thanks
    1,801
    Thanked 3,185x 2,291 Posts

    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Doug James View Post
    It sure looks good with 82° field of view, and priced where I want to be as well. Do you not think it's drawing a fine line between workable and unworkable with the Omni XLT 120 ?
    For the target we discussed (Moon, planets, doubles) and under good seeing conditions Meade UWA will work fine with your scope. Meade UWA and ES 68 and 82 have the same (great) optical quality.

  12. The Following User Says Thank You to Bigzmey For This Useful Post:

    Doug James (12-18-2018)

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. What was I thinking ??
    By derf in forum Astronomy Beginners Forum
    Replies: 5
    Last Post: 03-05-2016, 08:46 PM
  2. Thinking about a New Tab
    By Blackhorse11th in forum Astronomy Forum
    Replies: 0
    Last Post: 02-09-2013, 03:15 PM
  3. Technology Changes Thinking, Can Your Thinking Change Technology?
    By technologypost@yahoo.com in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 04-24-2006, 06:57 AM
  4. THINKING
    By Double-A in forum General Astronomy Forum
    Replies: 0
    Last Post: 11-15-2004, 06:55 AM
  5. Just Thinking:
    By Wfoley2 in forum Amateur Astronomy Forum
    Replies: 6
    Last Post: 06-28-2004, 04:29 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 09:39 AM.