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Thread: Does anyone strictly use 2" EP's?

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    Default Does anyone strictly use 2" EP's?



    A few weeks ago, I posted a slightly negative review on my opinion on the ES 24MM 82* 2"in comparison with the stock 25mm 50* 1.25 EP that came with my scope. I felt the ES wasn't that much better. The next session my views changed somewhat and was liking the 2" better. It was brighter/crisper. Then the clouds rolled in for the last three weeks.

    Last night and early this morning, I got lucky with clear sky's. I was doing lens comparisons and NOW was blown away at the vast improvement the ES 2" had over the 1.25". EVERYTHING and I mean EVERYTHING had a much brighter and crisper view. I saw Beta Mono triple star with my 1.25" 10mm . Then I put in the ES 18mm 2" and was stunned that, overall, it was better than the 10mm. Of course brighter but so much cleaner/crisper. The 10mm 1.25" could split the stars a little better but the view was just better with the 18mm 2".

    The rest of the session, I just kept grabbing the 2" EP's.

    My question is, forgetting FOV, cost and planets, are the 2" lens just better in general? I would assume the better TV's would be on par with these 2" ES and maybe even better (not trying to start a TV debate). But they are much more expensive. Comparatively speaking, are 2" EP's better than 1.25"? And does anyone use 2" ONLY? And am speaking more about DSO's, not planets.
    Last edited by My 2 Stars; 01-02-2016 at 01:38 PM.
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    Default Re: Does anyone strictly use 2" EP's?

    I made the switch to 2 inch eyepieces 1-1/2 years ago. I never pick up my 25mm 1.25 inch eyepiece for anything any longer. I will use a lighted par focal 1.25 inch eyepiece for alignment purposes.

    I think the answer comes down to you getting what you pay for. I bought the 2 inch Celestron eyepiece kit, which I have found is delightful to use. My biggest focus at the time was the larger FOV and brighter image. (striving to get closer to the 7mm exit pupil figure). From what I've read, for small exit pupil high magnifications (short focal lengths), there is no benefit to using 2 inch eyepieces. Exit pupils on the order of 0.7 to 1mm are used for planetary and other high magnification situations. Since my focus is primarily imaging I have foregone the shorter focal length eyepieces for the time being, but, when I do have the money freed up, I will be investing in high quality 1.25 inch short focal length eyepieces (target exit pupil around 1mm with my SCT).
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    Default Re: Does anyone strictly use 2" EP's?

    "Better"? No, you can't make this generalization. 2" eyepieces are bigger only. You can get crap 2" eyepieces, just as you can with 1.25" eyepieces.

    What makes an eyepiece better is the brand name (TV, ES, etc) and the design. A Nagler is better than a Panoptic, even though both are Televue, and both are better than a Plossl. And a Televue Plossl is likely better than a Celestron Plossl.

    However, if the question is, would I reach for a 2" eyepiece if I am viewing DSOs, the answer is, heck yes!! For DSO hunting, I want a bright, low-magnification view with a large field of view. The large field of view is only available in 2" eyepieces.
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    Default Re: Does anyone strictly use 2" EP's?

    Lol..Oh boy... Eyepieces are very personal for instance:
    Keith said Naglers were better the Panoptics although both are made by Televue...

    In my opinion... as a guy.... who sold his few Naglers and replaced them with Paranoiacs I can not agree with Keith on this one..I just find the Naglers were more uncomfortable for me to use since I had to shift my eyeballs all over the place to "see" the entire FOV... although Naglers cost a little more then Panoptics They are NOT better for all of us...

    Now every one of my 25 mm and HIGHER power eyepieces are 1.25 inch Eyepieces...and ...
    every one of my 26 mm and LOWER power Eyepieces are 2 inch eyepieces...

    2 inch are not better and honestly do not offer a darn thing over a similar design eyepiece that is higher power then a 25...what a 2 inch eyepiece offers is the ability to give you a wider FOV which is what most of us want (up to a point) when viewing DSO's...when view planets conversely most of us do not want NOR need a very wide FOV ...

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    Default Re: Does anyone strictly use 2" EP's?

    Agree with the others that the answer to your basic question is absolutely not. The only thing a 2 inch barrel does is give one the ability to squeeze more AFOV through. You could design a Plossl into a 2 inch barrel at 25mm if you wanted, but it wouldn't gain you one iota over your 25mm 1.25 Plossl as far as the view is concerned. It would cost you more because of the extra glass and metal, but you would be paying extra for zero return on performance.

    My ES 82 18mm is a 2 inch barrel in order to accommodate the wider AFOV. In my 10 and 12 inch dobs it is my DSO hunting eyepiece of choice because of the wide view and the bump up in magnification over my ES 82 24mm. But, I don't spend a great deal of time actually observing the DSOs with it. I of course make notes of what I see in the 18mm, but my bread and butter eyepieces for pulling out details are my 14, 11 and 8.8mm in the 1.25 format. Its also not unusual to not see DSOs in the 18mm (depending on the object of course), thus I am forced to push on to the 14mm for the added magnification to pull some out. I will say in the 17.5 inch, the ES 82 24 is my primary DSO hunting eyepiece, again because of the wide view and adequate magnification to facilitate the hunting process.

    John, I think the reason you are just now seeing the better view of the ES 82° 24mm is because you are getting more experience behind the eyepiece. Your comment about not seeing any real difference between it and your stock 1.25 inch EP initially has nothing to do with barrel size, but all to do with experience. Often times those with minimal experience of looking through different eyepieces can't see the subtle and sometimes not so subtle differences between various types and levels of eyepieces. The more you observe, the better your eye becomes at picking out things, whether that be objects and details in them, or the views through various eyepieces.
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    Default Re: Does anyone strictly use 2" EP's?

    I only have 2" EPs, but that, as others have said, is simply preference. I like the huge views I get, and I don't use high mag much. It's what you like and how much you want to spend. I collected EPs over time, and finally gave away the last 1.25" EPs a few years ago.
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    Default Re: Does anyone strictly use 2" EP's?

    I only own one 2" ep. (described in my sig). I am saving to get some more but have other items to address first.

    But typically I will use the 2" to view wide field objects such as open clusters and such. It gives a pretty decent view sort of panaramonic but for details and dustlanes etc I switch to the 1.25's that I have.

    When someone invents the cloud penetrating eyepiece I will get it regardless of size!!
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    Default Re: Does anyone strictly use 2" EP's?

    One disadvantage of the 2" eyepieces is that they are generally heavier. So I will take a 2" eyepiece in a fight any day over a 1.25".

    I have to agree that sometimes the wide fov eyepieces can be an acquired taste.

    Although I really enjoy my 13mm 100 degree Ethos, which is both a 1.25" and 2" eyepiece in one. In particular on my knew 98mm APO refractor.
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    Default Re: Does anyone strictly use 2" EP's?

    Although I am limiting myself to 1.25" eyepieces for the moment, due to cost concerns alone, as I slowly build my stable of 'better' sub-premium eyepieces this is what I think.

    Sometime, in the not to distant future, when my 1.25" stable is sufficiently populated, I'd be very keen to try a 2" eyepiece but only if I could find a 2"-to-2" Howie Glatter Parallizer type adapter for it.

    The bore on my existing OEM extended length 2"-to-2" adapter is so over sized, I'm afraid that even a pineapple sized 2" eyepiece would fall through it.

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    Default Re: Does anyone strictly use 2" EP's?

    I'm using all 2" eyepieces (Explore Scientific). My last 1.25" eyepiece was replaced with a new 100* 5mm ES. The only advantage I see is not having to swap in an adapter. But that's an expensive option for a little benefit. My main reason for getting them was the large field of view. It means less adjusting of the manual dob. I probably would be happy with the quality of the ES 82 line just as much.

    For the downsides, they're more expensive, more massive, and will require a large barlow. Quality-wise, it's probably easier for a manufacturer to make a high quality 1.25" than it is a 2". More surface area means more opportunities for mistakes.
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