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  1. #1
    Sim's Avatar
    Sim
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    Default Is a 2" worthwhile?



    All my EP's are 1.25" as I got them when I only had my 127SLT - now I've also got a 12"Skywatcher which will take a 2" EP - my question is, Is buying a 2" EP worth the additional cost - will the improvement be noticeable/worthwhile?

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  2. #2
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    Default

    Depends on which 2" eyepiece you buy.
    If you buy a good quality wide field 2" eyepiece the results can be nothing short of spectacular in a scope like yours.
    Cheap nasty 2" wide fields can leave you very disappointed indeed.
    Regards Steve
    Steve

  3. #3
    kencrowder's Avatar
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    Default

    You may want one for low mag wide field viewing.

  4. #4
    Bob327's Avatar
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    Default

    All of my lower powered eyepieces form 26 to 40 mm are 2 inch wide FOV (68-70 degree not the ultra wide 82 and 100 which I personally find uncomfortable to use ..I am in the minority on that count btw)

    I would see if you borrow one at a star party or from a friend ..I'm betting that you will then go out and buy one after you see what the do...

    Bob G
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  5. #5
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    Default

    For low magnification, wide field of view eyepieces - Yes, you can get much nicer 2" eyepieces than in 1.25". The reason for this is that your scope produces a circular image - and your eyepiece then magnifies that. For higher magnifications, you're only looking at the central part - so there's no benefit to a 2" eyepiece - but at low magnifications, or with ultra wide apparent field of view eyepieces at a bit higher magnifications, you're looking at much more of the image your scope produces - and then the 1.25" barrel becomes a limiting factor. You can see this in 40mm 1.25" eyepieces - they have a restricted field of view because of the barrel limit, and usually don't show much more true field than a 30mm. On the other hand, because a 2" barrel lets you see much more of the image that your scope produces, you can get really nice wide view 40mm eyepieces, and ultrawide 30 or 26mm or so ones.

    Things to be aware of: Because most scopes with 2" focusers come with a 1.25" adapter that goes in the end of the 2" focuser, you usually find that you need to rack the focuser out further, since the 2" eyepieces go further into the focuser - and tend to be longer focal lengths too, so need to end up a bit further away from the focal plane too. You may find you need to add a short extension tube, or clamp the 2" eyepiece when it isn't fully into the tube (but make sure its still secure :-) ) in order to get it to focus.

    Also, if you have a fast scope, you may need to invest in more expensive eyepieces to get good results - many budget designs work fine in slow scopes, but start showing problems round the edges in faster ones.

  6. #6
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    Default

    Same as Bob -- all of my eyepieces over 26mm are 2 inch -- it's the only way to get the maximum wide field low power view.

    Clear skies.
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  7. #7
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    Default

    On a larger Dob my vote would be for 2" eyepieces for low and mid power eyepieces. Mine are 1.25" from 5.2mm~13mm and 2" from 17mm~40mm. I would suggest that it is possible to have more apparent FOV with some designs than you can comfortably use, if you can try out different designs before you buy. Personally the Pentax XL 40 is my favorite low power eyepiece and the Nagler 22 and 17 are also very nice. What ever you choose I think you'll enjoy them. That said I still love my 32MM Televue Plossol.

  8. #8
    ChuckWalters's Avatar
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    Default

    On my DOB I always find myself grabbing for the 2" EP's. Favoring the 26mm and the 35mm. The wider views are worth it to me, but as stated above, cheaper 2" EP's won't be any better than the views in your 1.25" EP's.
    CHUCK WALTERS SCOPES: Celestron 1100 XLT; EdgeHD 800; Exp. Sci. ED80 APO; AR102; Orion 10" f/4 Astrograph; XT8 LE; Astro Tech AT72ED Coronado SolarMax II 60 BF15 MOUNTS: Celestron CGEM DX; CG-5GT; NexStar 6/8SE CAMERAS: JTW Ice Cube 650D BCF; JTW Ultimate 1100D v3; IS DBK21AU618; DMK21AU04 ZWO ASI120MC; ASI120MM SOFTWARE: StarTools 1.3; PixInsight; RegiStax 6; PHD; BYEOS; APT 2.0; FireCapture 2.2

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  9. #9
    Joe Lalumia's Avatar
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    Default

    EXCEPT for this one---------- cheap-----

    GSO Superviews
    GSO Product Reviews and Ratings - GSO (Guan Sheng Optical) - GSO 2" SuperView Eyepiece - 30mm from Agena AstroProducts

    GSO 2" SuperView Eyepiece - 42mm

    The next step in my opinion would be a Televue Paragon...... which is CONSIDERABLY higher in cost.
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