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  1. #1
    sedativechunk's Avatar
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    Default Buying new eyepieces for Orion telescope - suggestions?



    I need some help picking out the next right eyepiece for my telescope. So now I want to upgrade to some better eyepieces for my XT8i telescope. All I have now are the stock 10mm and 25mm eyepieces, with some great filters and a barlow lens for maximum power when the skies are right.

    Now I want to upgrade to something better for deep space objects. Primarily faint galaxies and nebula. The 25mm eye piece has worked good, but I think I can do even better with a higher quality eye piece. I was thinking upgrade to either 32mm or 40mm of the following eyepiece:
    TeleVue Telescopes Plossl Eyepieces - Telescope Eyepieces at Telescopes

    I'm looking at a budget of around $130.00 for one eyepiece. That's way more than what I want to spend, but I figure the more I spend, the better quality eye piece it's going to be. I will gladly go for something alot cheaper though if the quality is just as good!
    One thing I noticed now on these forums that are popular are the "zoom eyepieces." What exactly are these and would they work well for nebula and galaxy finding? If this would give me multiple levels of strength, then I may want to go for one of those instead!

    Any tips or advice is greatly appreciated. I research deep before buying anything so I get the right stuff.
    Orion XT8 w/ finder scope & laser site - OIII, S, UHC, 82a blue and 56 green filters, 3x barlow, 10mm, 25mm, 40mm eye pieces, Stellarium user
    Galaxies Found:
    M65, M66, Andromeda, M10, triangulum, sombrero
    Nebula found:
    Trifid, Eagle, Omega, Orion, Dumbell, Ring
    All 7 planets found

  2. #2
    caheaton's Avatar
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    Default

    Unless you're looking for wider FOV, I think I'd stick with the EP you have, use them with the barlows and learn which FL are of most use to you and then <maybe> upgrade to higher quality EP. I have an XT10i and have been using it with my Meade Super Plossls (on a par with the Orion Sirius as to quality, in my opinion). I honestly have no complaints about the view...except that the FOV is a bit narrow (I had been using them in an F5 80mm refractor where I came to take super wide FOV for granted ). I did buy a 30mm ultra wide for use as a finder and for taking in large objects such as the Veil, but keep in mind that unless you have very dark skies such a large exit pupil will give you gray skies and low contrast. This will wash out many faint galaxies and nebula.

    I've found that an exit pupil of about 2 to 2.5mm gives me the best contrast and hence the best views of DSO. This corresponds to an EP FL of around 13mm (give or take a mm) for your scope, so by barlowing your exisiting 25mm you should have just about the perfect ep (except for a narrower FOV).
    Craig

  3. #3
    Remus's Avatar
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    Default

    I have the XT6 Classic. It came with the same 10mm and 25mm EP.

    I Purchased this Eyepiece in a 32mm and a 17mm.
    Orion Highlite Plossl

    Since you have a 2 inch focuser you may like something more like this.
    Orion Q70

    I'm pretty sure the XT8i has a 1200mm focal length.
    I love my 32mm, crystal clear with pinpoint stars.
    The Q70 will give a much wider true field of view though.
    Probably would be nicer for clusters like the Pleiades.

    There is an eyepiece calculator for Excell here
    Eyepiece Calculator thread

    Nice for making comparisons between EPs

    Zhumell Z10 with Telrad
    25mm, 17mm, & 10mm Orion Plossls
    Agena Astro 26mm SWA 2" ** Love it!
    Meade 36mm 2"
    GSO 2" 2X ED Barlow
    10x50 Nikon Action Binos, Celestron 7amp Power Tank
    AstroZap Dew Controller and Accessories.

  4. #4
    MarkM's Avatar
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    Default

    Quote Originally Posted by caheaton View Post

    I've found that an exit pupil of about 2 to 2.5mm gives me the best contrast and hence the best views of DSO. This corresponds to an EP FL of around 13mm (give or take a mm) for your scope, so by barlowing your exisiting 25mm you should have just about the perfect ep (except for a narrower FOV).
    Craig
    That is what I determined using my 1200mm FL XT8i--a 13mm Nagler was about perfect.

    That being said, as I endeavor to observe very faint galaxies (eg, dimmer than mag 13) with the f4.5 15" many are just not visible until I crank up the magnification to 345x which corresponds to an exit pupil of 1.1mm using a 5 mm Nagler. The brighter, larger galaxies do look a bit better with the 9mm Nagler (exit pupil of 2)--as you say more contrast and hence more detail.

    When manually tracking, I prefer the wider view of a Nagler or Stratus/Hyperion so that i dont have to nudge as often, particular at high magnification. It's something to consider.
    Last edited by MarkM; 11-18-2009 at 09:58 PM.
    Location: 30° 19' N; 97° 54' W; elev 248 meters; yellow/green zone; NELM 5.7
    Instruments: Obsession 15" Dob; Orion XT8i; 2" refractor (Galileoscope); Televue EP arsenal; Bushnell 7X50 binos
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  5. #5
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    Default

    I have the XT6 and the only additional eyepiece I have is the 30mm Ultrascopic. It produces some pretty good images.
    "Folks are basically decent, conventional wisdom would say. Well we read about the exceptions in the papers everyday." -- Neil Peart

  6. #6
    ebusinesstutor's Avatar
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    Default

    I have the identical scope. Here are the eyepiece purchases I made that I am pleased with.

    Baader Hyperion 8-24mm Click Zoom
    2x Barlow
    36mm Siebert Observatory
    4.9mm Siebert Star Splitter (on its way so haven't tried it yet)

    The zoom gives me the equivalent of 17 eyepieces in the range from 8mm to 24mm. The 2x barlow gets me down to 4mm when I need higher magnification.

    The 36mm is used for low power wide angle views.
    Garland Coulson
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    http://NanaimoAstronomy.com

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    XT8i dob
    Hyperion 8-24mm Click Zoom

  7. #7
    ibase's Avatar
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    Default

    Will 2nd the Hyperion 8-24mm zoom and Siebert 36mm (mine's in transit) combo. The Hyperion zoom is one of the best value eyepieces today and is a boon to beginners and veterans alike, it has changed the landscape by proving that a zoom can stand up to the performance of good fixed-focal length eyepieces. The Hyperion zoom is my favorite #1 eyepiece in around 40 EP's in my collection which includes several TV Naglers.

    Best,

    Hernando

 

 

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