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  1. #1
    jeff greer's Avatar
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    Default 2" eyepiece VS 1.25" eyepiece



    What are the main advantages of a 2" eyepiece over a 1.25" eyepiece? Is it really worth the money to upgrade too the 2" eyepieces.

  2. #2
    pederv's Avatar
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    Default

    Two inch has larger true field of view limit.
    Depends on how much of the sky you want to see at a time.
    Read somwhere that the two inch can see about 2.5 degrees of the sky, a 1.25 less.
    Name - Verne / Call sign - KF7UHL

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    Atlas 10 EQ-G
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    / Orion 130ST on an AstroView Mount with RA Drive
    EPs - Orion Plossl (10mm, 25mm, 32mm, 40mm), Tele Vue Plossl (32mm), Orion Stratus (5mm), 12.5mm Orion Illuminated, 7-21mm Orion Explorer II, set of Orion Q70's
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  4. #3
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    Default

    It depends on what kind of telescope you have and what focal length the eyepiece is. The two inch eyepieces are only really needed at the lower end of your magnifications, and they also become more worthwhile (necessary) for ultra-wide field of view eyepieces at the longer focal lengths. What type of telescope do you have?
    Name: Sam
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    12” Collapsible Dob w/Telrad, Explore Scientific 30mm 82*, and 20mm, 14mm, & 9mm 100* EPs, Tele Vue 4X Powermate & Paracorr T2, 2" Lumicon UHC and ND13 (
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    ) Filters, 2" Astronomik OIII filter, dew heater system, and Nikon Action 7x50 EX Extreme ATB 6.4* binoculars & Celestron 15x70 binoculars.

    I'm enjoying learning the sky by star hopping; just charts, my binoculars, and my Dob!

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  6. #4
    deaman49's Avatar
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    Default

    Knowing what equipment you have will help in giving you advice.
    Lee

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  8. #5
    jeff greer's Avatar
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    Default

    I have a nexstar 8 se, focal length 2032mm, focal ratio f/10. Thanks.

  9. #6
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    Default

    Get a Televue Panoptic 35mm


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    9x50 RACI, Canon EOS T3
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    Eyepieces: 5mm, 10mm and 24mm Hyperion 1,25", 36mm Hyperion-Aspheric 2"
    Other: Celestron 2" XLT Diagonal, Celestron Ultima 1.25'' 2x
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    , Celestron UHC/LPR Filter - 1.25"


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  11. #7
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    Default

    Jeff,
    For me it's the 2". The main reason is the comfort and that emersion and swimming in the sky view you get with the wide angle lenses. But you do need a rather larger scope/mount as they are quite heavy.
    Are they better than the 1.25"? That's a question with a million opinions.

    Clear skies

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  13. #8
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    Default

    Quote Originally Posted by spouk3 View Post
    Get a Televue Panoptic 35mm
    LOL...Yep that is a good but kind of expensive eyeiece ...I run a CPC1100 in addition to an 8i (earlier model of the 8SE which the Original poster has)...

    I do use a 35 mm Pan when I am observing from home in my observatory in both scopes...


    BUT I also do a lot of outreach sessions for school kids etc and use a CHEAP ( under 100 bucks) 34 mm Meade SWA eyepiece and leave the good stuff at home...Meade discontinued these a few years ago but you can still find them on the used market ...

    In a SLOW f/10 SCT the MEADE almost is a good as the Pan ...by almost I'd say it is 98 percent as good...BUT costs much much less...

    BTW...all of my eyepieces I use in my SCTS that have a focal lenfht below 25 are in 1.25 inch format and all of my eyepieces above 26 mm are in 2 inch format...

    Bottom line you do not need high end glass (expensive) in the 8Se ...or any other f/10 SCT ..

    Bob G.
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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  15. #9
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    Default

    I agree with Bob. Telescopes with higher focal ratios don't need the high-end eyepieces nearly as much.
    Name: Sam
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    12” Collapsible Dob w/Telrad, Explore Scientific 30mm 82*, and 20mm, 14mm, & 9mm 100* EPs, Tele Vue 4X Powermate & Paracorr T2, 2" Lumicon UHC and ND13 (
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    ) Filters, 2" Astronomik OIII filter, dew heater system, and Nikon Action 7x50 EX Extreme ATB 6.4* binoculars & Celestron 15x70 binoculars.

    I'm enjoying learning the sky by star hopping; just charts, my binoculars, and my Dob!

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  17. #10
    AbbN's Avatar
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    Default

    I got the Celestron 2" EP set on sale a while ago ( Eyepiece and Filter Kit - 2 in (item #94305) / Accessory kits / Accessories / Products / Celestron.com ) and am happy with it. No, they're not super high quality EP's and I didn't expect them to be, but they do the job and they're much better than I was honestly expecting - if they were crappy I would have sent them back, sale or no sale price. I've used them only on my 8" Dob. It's like looking through a porthole as opposed to a small round window. A few nights ago I finally got to see the entire double cluster though the 40mm lens - absolutely amazing!

    Good luck with whatever you decide
    Telescopes: Celestron Omni XLT 120, Explore Scientific AR102,
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    ST80 Refractors; 8"
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    Dob; Orion Apex 102 Mak; Coronado PST. EP's: ES 4.7, 6.7, 11, 18 and 30mm 82° EPs; Baader 24mm 68°; Luminos 15mm 82°; Meade 8-24mm Zoom. Other: CG4+16" Orion Pier Extension; Celestron 20x80 binos etc;

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    The Bible tells us God created the Universe; Science tells us how He did it; And through my telescopes I marvel at His handiwork

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