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Thread: 2'' Eyepiece question

  1. #1
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    Default 2'' Eyepiece question



    I have a Celestron CPC 1100, will be using for just visual use, DSO's and Planets. I do have a focal reducer, will there be any visual benefit using 2'' diagonal and eyepieces or should i just stick to the 1 1/4''? If so what would be a good 2 eyepiece choice for my needs as far as mm wise. Thanks

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    Default Re: 2'' Eyepiece question

    It all depends on the intended targets. A 2" diagonal will certainly add a lot of versatility to the 1100. It has such a long focal length that it becomes almost necessary at times when aiming at larger/extended DSO's. Being coupled with the focal reducer when needed adds even more versatility. Just a personal opinion, but I say most definitely yes.
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    Default Re: 2'' Eyepiece question

    In terms of eyepiece choices, I would be looking to get one with the maximum possible field, to maximise the 2" possibilities. If you have a look at the Televue "eyepiece calculator" (Tele Vue Optics: Calculator ) you will see that the biggest field is with either a 41mm Panoptic or a 55mm Plossl: both of which give you 0.94 degrees true field (without the focal reducer), and at 68x and 51x respectively. The 55mm plossl also gives you an exit pupil of 5.5mm, which will maximise the light coming into your eye for dso's. There are obviously lots of brands out there, so you can use that calculator as a good starting point .

    For higher power views, once you get shorter eyepieces than 24mm or so (around 120x), 2" eyepieces make no difference, and you might as well go for 1 1/4" eyepieces.

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    Default Re: 2'' Eyepiece question

    PS: The Televue eyepieces are not cheap, but I have a Parks 50mm plossl, which is a very nice eyepiece and one that you might be able to find second-hand. An excellent and great value option for long FL eyepieces is to try Russell Optics (Russell Optics & Machine ). I wanted to try some of his offerings, but he doesn't ship outside the US... You should have no problem though. I remember some good comments about his optics in general, I think from not_Fritz_Argelander amongst others (you might like to confirm or deny this not_Fritz! )

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    Default Re: 2'' Eyepiece question

    As far as 1 1/4'', i already upgraded my diagonal and i have a 10mm celestron lumius. Might just pick up a good 1 1/4'' 18-20mm and a 2'' diagonal and 1 nice low power eyepice.
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    Default Re: 2'' Eyepiece question

    The main and only benefit of 2" EPs is that they provide wider field of view compared to 1.25" Since SCTs have relatively narrow FOV stepping up to 2" EPs definitely helps to address it.

    One or two 2" EPs should be enough. My favorite and most used 2" EP for SCTs is Baader Aspheric 36mm. The good thing is that been F10 scope SCTs are not fussy about EPs. Anything from Antares Erfles, Orion Q70s and GSO Superviews between 26mm and 56mm would deliver. I tried them all at some point in my SCT and they all work quite well. But my favorite once again is Baader Aspheric 36mm.

    Also, as Dean mentioned it is nice to have 55-56mm Plossl for extra large targets. I tried so far TV Plossl and Russel Optics Super Plossl. Both works to the same degree. I kept Russel Optics.

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    Default Re: 2'' Eyepiece question

    Thanks all for the input.

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    Default Re: 2'' Eyepiece question

    My personal picks would be a good 10mm (60-82 degree wide), 13-14 ( same), 20-22 (80-82 wide), and a 31mm Nagler or 41mm Panoptic equivalent if not the real deal. All without the reducer.
    My actual eyepieces for this spread are 10mm Pentax, 14mm Delos, 22mm Nagler, and 41mm Panoptic for comparison.
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