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  1. #1
    Neophyte_Astronomer's Avatar
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    Smile EP Advice Needed 4 10" Dob–If U Could Only Purchase 1 EP, Which 1 Would It Be?



    Eyepiece (EP) Advice Needed for Dob 10 Inch – If You Could Only Purchase One EP, Which One Would It Be?

    I have read through some posts and there is so much information to disseminate.

    Hopefully, someone will take pity on me even though I am sure the answer is somewhere.

    If you had the money ($300 to $500) to purchase only one eyepiece for a 10 inch (254mm) Dob, what eyepiece and its magnification (10 - 40 mm) would you purchase?

    I thought about the Naglar, but a person tonight really likes the Panoptics.

    I was going to go with the 16mm Naglar, but now I am not sure.

    This eyepiece – hopefully – would bridge the gap between deep space viewing (probably 90% of my viewing) and planets as well.

    Any suggestions would be welcomed for the following telescope (thanks in advance ):

    Sky Watcher 10 Inch Dobsonian Telescope S11720

    Aperture (Diameter): 254mm

    Focal Length: 1200mm

    F-Ratio: F/5

    Highest Practical Power: 508x

    Faintest Stellar Magnitude: 14.7

    Resolving Power: .59 arc sec

    Focuser Diameter: 2", 1.25" adapter
    "Imagination will often carry us to worlds that never were. But without it we go nowhere.” ~ Dr. Carl Sagan
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  2. #2
    MarkM's Avatar
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    Default 13mm Nagler Type 6

    Check out this review and you will see this EP performs very well on a scope of 1200mm focal length: 13mm Nagler Type 6 Eyepiece: A Comparative Review

    Barlow the 13mm and you will get 184x which is quite nice for brighter galaxies and globs and planets. The unBarlowed 92x is perfect for observing fainter galaxies and for nebulae (particularly in conjunction with an UHC filter).

    Once you start enjoying 82 degree AFOV there is no going back--which is why I would go Nagler over Panoptic. Wont break the bank either.

    I think some may argue you should go 9mm Nagler--I cant comment on this as mine hasnt arrived yet
    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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    Neophyte_Astronomer (10-08-2009)

  4. #3
    Neophyte_Astronomer's Avatar
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    Default

    Thank you for the suggestion, your study, and the article.

    It helps immensely.
    "Imagination will often carry us to worlds that never were. But without it we go nowhere.” ~ Dr. Carl Sagan
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  5. #4
    ottUp's Avatar
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    Default

    I think your original choice of 16mm would also have been good. Probably my favourite eyepiece for my 10" (ish) scope is my 17mm type-4 Nagler. Those are about $400 new, $300 used.

    At 10" aperture, your Dob will shine at moderately deep-space objects, so your good eyepiece should be one that gives a nice wide field, relatively low power. A 17mm Nagler would give 70x power, great for many DSOs. True, it's not high power for planets, but this is a Dob, and manually tracking planets at high power is not what it's best at - studying clusters, nebulae, and galaxies is its strength.

    So my vote would be the best eyepiece you can afford in the 12mm (100x) to 20mm (60x) focal length range, with a wide field (like the 82mm of Naglers). These longer f/l eyepieces also tend to have better eye relief, which is more comfortable for long studies of objects, and permits visitors to your scope to view with their glasses on, so they don't have to re-focus.

    All things considered, I would recommend a 16mm type-5 or 17mm type-4 Nager if you can get your hands on one. Both are within your stated budget, and would quickly become your favourites.

    - Richard
    C9.25,AT8RC,SV105,SV80,Pronto,TV60
    on: ParamountMX,G11,GM8,DM6,HalfHitch,M4
    Ottawa, Canada

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  7. #5
    Lenbo's Avatar
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    Default

    Don't have Naglers but my favorite eyepieces are the 17mm and 13mm Hyperions. The Naglers in that range would have to be even better. Magnification and field of view versus my viewing conditions. If you were considering a zoom I've read really good things about the Hyperion.
    Len
    Astro Tech 150mm mak f/12 -
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    8 inch reflector f/4.9 - VRC8 (RC Mod for Mallincam)
    Orion Atlas EQ mount - EQMOD
    TV Radian 6 mm / Baader Hyperion Eyepieces 8,13,17,24 mm / Meade SWA 28,34 mm/ES 82 11mm

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  9. #6
    ebusinesstutor's Avatar
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    Default

    I would purchase the Hyperion 8-24mm Click Zoom. This would give you the equivalent of 17 different eyepieces in the 8-24mm range for only $215.

    I own one and love it. Add a 2x barlow and you can get up to 300x magnification on your dob.

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  11. #7
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    Default

    Absolutly nothing wrong with the Naglers, Or Panoptics ..heck I own and use a few myself along with my personal favorie a couple of Pentax XW's...

    HOWEVER... I get the feeling that you are new to astronomy and are operating (or trying to) on a budget (been there done that as most of us have)...

    The suggestion of buying a few Baader Hyperions is extremely good in my opinion.. Lets face it... at 1/3 the price of the high end glass they deserve a look... from my experience using them in both an f/10 Sct and an f/6 Refractor I know I will not quite match the big expensive eyepieces BUT darn if they do not come very close on axis they are fine then only real difference is at the extreme edge of the FOV ..and you have to look for it..

    For now I'd be looking at the Hyperions...(and I'd try to do just that at a star Party) then let you own eyeballs help you decide to buy 3 hyperions or one of the High end eyepieces...

    Bob G

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  13. #8
    LazyEyepiece's Avatar
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    Default

    If I couldn't do a Hyperion, I'd toss down on a Baader 2" @ 20mm.
    My God, It's full of Stars
    12" Zhumell Deluxe
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    32mm 2" GSO EP
    9mm 1.25" GSO EP
    4mm 1.25" Meade Super Plossl
    2X GSO
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    (2" - 1.25")
    Switching to Baader Ep's

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  15. #9
    Neophyte_Astronomer's Avatar
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    Default

    Thank you ottUp, Lenbo, ebusinesstutor, LazyEyepiece, and Bob327 for all of your suggestions.

    It is true I am new - purchased first scope in February from a hobby store and got the dob around the first of May.

    I forgot to mention that I did purchase the Celestron Telescope Eyepiece - Filter Accessory Kit - 94303 along with my Dob.

    I just figured that I would budget for one great eyepiece(s) to last me until about April of next year.

    It seems there are so many choices that it makes your head swim.

    Thanks again for all of the suggestions and I have started looking at all of the recommendations.

    "Imagination will often carry us to worlds that never were. But without it we go nowhere.” ~ Dr. Carl Sagan
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  16. #10
    Kevin Z's Avatar
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    Default

    The Baader Hyperion has been suggested, and I second the motion.
    As an example, look at the 21mm Baader Hyperion, 68 degree AFOV.
    Add the two fine tuning rings 14, 28 and a 2" baader filter.
    You have 6 effective eyepieces! The barrel comes off the bottom and the tuning rings can be added to change the focal range
    Put a 2 inch filter in and the lens becomes an 18.5mm
    Put the 14 tuning ring in and the lens becomes a 17.6mm
    Put the 28 tuning ring on and the lens becomes a 15.5mm
    Put both the 14 and 28 on and the lens becomes a 14mm
    And if thats not enough, leave the 1 1/4 barrel off and the lens becomes a 2 inch 32.2mm Extra wide
    All the series, (except the 24) have this flexibility.
    Not to mention the Hyperions compare favorably with EP's costing three times as much
    http://www.alpineastro.com/Hyperion-...n_Manual_1.pdf

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