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Thread: Which eyepieces are the best? Plossl, Baader, Kellner, etc?

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    Default Which eyepieces are the best? Plossl, Baader, Kellner, etc?



    I purchased some Olivon eyepieces and they work grerat. Are there better eyepieces in that same price range?

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    Default Re: Which eyepieces are the best? Plossl, Baader, Kellner, etc?

    Which specific Olivon eyepieces did you purchase? There are the Olivon 58 degrees and the Olivon 70 degrees. Just wanting to see because it will help in narrowing down the price range. Also, what telescope are you using? Again, it will help with recommendations.
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    William.

    Telescopes - 203mm (8") F/5.9 Skywatcher Dob, 102mm F/9.8 Celestron C102-HD refractor
    Eyepieces - Agena SWA 70 deg 38mm, Agena SWA 70 deg 26mm, Celestron Luminos 82 deg 15mm, Celestron X-Cel LX 60 deg 12mm, 9mm, ES 82 deg 8.8mm, Orion 55 deg Edge-On 6mm

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    Default Re: Which eyepieces are the best? Plossl, Baader, Kellner, etc?

    "Best" is one of those four letter words that i don't like to use in polite company. There are so very many attributes of eyepieces (focal length, apparent field of view, eye-relief, exit pupil size, etc.) that it's very hard to just say "this is the best one".

    While it is difficult to argue that there's a "best" for everyone... but one might be able to argue that there's a "best" for a given scope or given user. And then of course there's the question of price... if money is no object, there are some amazing eyepieces. Unfortunately money usually is a factor.

    Kellner and Plossl are optical design types. Baader (Baader Planetarium) is a brand name.

    Kellner is a fairly simple, low cost, but also lower optical quality design (a simple achromat design). A low-end telescope might include Kellner eyepieces.

    Plossls are also fairly low cost, but have an optical design that's a little better than a Kellner and also a slightly wider apparent field of view (between 50-55º), but usually not a very long eye-relief (which can be a problem for people who view while wearing glasses.) The eyepieces that are often included when you buy a new scope are usually Plossls. Lots of companies make Plossl eyepieces.

    There are some very high-end eyepieces available... if you want to shell out $800 for a single eyepiece, there are a couple of vendors who have some choices for you (yes... really!)

    There are quite a few eyepiece choices on the market these days... and of note are that there are quite a number of choices that offer a fairly wide (to ultra-wide) apparent field of view.

    A simple Plossl design probably offers an apparent field of view which will be somewhere between 50-55º. At that point your eyes will see the edges of the field of view (so it will appear the you are looking through a tube.) As you get into wider eyepiece designs.... 68º... 82º... 100º... 110º the field of view becomes "immersive". You can't see the edges of the field of view (it does not look like you are "looking through a tube" anymore. It's sort of like going to watch a movie on the IMAX screen... you really have to look around to take in the view.

    At 68º you won't notice the edges unless you look around... and then you'll see them.

    At 82º*you'll really have to look harder to see the edges.

    At 100 or beyond... it's actually hard to see all the way to the edge of the eyepiece field of view even when you're really trying.

    There are also some choices with particularly long eye-relief (great if you need to wear glasses while viewing -- the TeleVue Dioptrix line is specifically designed for long eye-relief). If you don't need prescription lenses to correct for astigmatism, then you can remove your glasses while looking through the telescope and just adjust the focus to compensate for your prescription lenses. But normally the telescope cannot correct for astigmatism... for that you *usually* need to wear glasses. I say *usually* because it turns out TeleVue makes adapters that fit on several of their eyepiece models that can even correct for astigmatism (the catch is they don't just fit on any eyepiece... you have to own the right model eyepieces.)

    ALSO... some eyepieces are designed to be "parfocal" with other eyepieces. Normally when your telescope is focused for one eyepiece, if you switch eyepieces you'll need to re-focus the scope. But if the eyepieces happen to be "parfocal" to each other then it means you can switch between eyepieces and not need to adjust focus. (You can also get something called parfocal rings... it's a ring that goes around the eyepiece barrel and it has a set-screw... it prevents the eyepieces from being inserted into the telescope completely... it's basically "shimming" up the eyepiece so that it is parfocal with your other eyepieces.
    Tim Campbell


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    Default Re: Which eyepieces are the best? Plossl, Baader, Kellner, etc?

    OTA: Celestron Astromaster 130EQ and Orion Astroview 90mm refractor. I got the 58 degree HD Olivon.

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    Default Re: Which eyepieces are the best? Plossl, Baader, Kellner, etc?

    Quote Originally Posted by Orlando View Post
    OTA: Celestron Astromaster 130EQ and Orion Astroview 90mm refractor. I got the 58 degree HD Olivon.
    I have four of the Olivon HDs (20, 15, 6, and 4mm). Between them and my two X-Cel LX EPs I was pleased for quite a while before I decided to start upgrading. For the price the Olivons are good EPs, as are the X-Cels and the Zhumell Z series. My 17.3mm Delos cost more than 5 times what one of my Olivons cost, and while there is a noticeable difference it's certainly not 5 times better. That's definitely no knock on the Delos, it's a fantastic EP and I'd recommend it to anyone who has the funds for it without hesitation. I'm just saying it is possible to get good quality views without breaking the bank, and in my experience the Olivons delivered nicely for what I paid. The Celestron X-Cel LX EPs are also good, in the event you're looking to add another EP or two to your collection.
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    Default Re: Which eyepieces are the best? Plossl, Baader, Kellner, etc?

    Thanks! I'll check out the Zhumell Z. Right now I am in the process of upgrading my OTAs. Maybe then!

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