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    Question 1 or 2 Inch Celestron Plossl Telescope Eyepieces



    Hi guys, I am wondering if i should eventually invest in eyepieces although I would rather get 2" ones. Any differences between the 1.25" and 2" eyepieces?

    Also there is a Celestron bundle here for $260 AUD is it any good?:

    • Five Superior Grade Plossl Eyepieces
      • 1.25"(31.7mm) - 4-element design with a 52 AFOV (32mm has a 44°)
      • Superb color, resolution, edge sharpness, and clarity.
      • All eyepieces are fully multi-coated for maximum contrast and resolution.
      • Included eyepieces are:
        4mm
        6mm
        9mm
        15mm
        32mm
    • Barlow Lens - 2x 1.25" (31.7mm)
      • Complements the Plössl eyepieces in this kit and gives you a total of ten power combinations. The highest grade glass optics with fully multi-coated lenses are used so there is no degradation of image.
    • Six Colored Eyepiece (Planetary) Filters - 1.25" (31.7mm)- Included are:
      • Kodak Wratten #12
      • Kodak Wratten #21
      • Kodak Wratten #25
      • Kodak Wratten #56
      • Kodak Wratten #58A
      • Kodak Wratten #80A
    • Moon Filter - 1.25" (31.7mm)
      • A neutral density filter which allows you maximum enjoyment of the moon especially during the brighter phases.
    • Impact Resistance Metal Carrying Case
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Default

    any ideas or should i save over the years for 2 " eyepieces
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Default

    Its a big question here Gus, so lets work through it a bit.

    I know off the top of my head that i am not quite accurate, but you won't gain much using 2" until you go to a longer F/L than around 25mm. Then what you do gain is wide AFOV with a lot of light but at low mag, and plenty of eye relief. big advantage for "faint fuzzies' but no gain at all for planetary/lunar or anything where you want to crank up the mag.

    Personally, and I know I am not the only one, I like to use a 2" light train (ie diag and barlow if required) as it lends much more sturdy physical support to the bulkier EP's that can be used in either 1.25" or 2" mode. Examples are the Baader Hyperions, and the Vixen LVW's. But there is no nett gain at your eye from using these types of EP through a 2" train as far as what you see is concerned, as opposed to using the same EP's in 1.25" mode.

    Re the EP package, I have to say that I am not familiar with this one, so I am using an educated guess.

    I am not a fan of these packages because although they appear cheap when you add up all the contents purchased seperately you do save a few bucks, but you end up with a lot of bits and pieces that you will never use. Better to selectively buy a few better quality oculars and maybe a filter or two.

    So lets look at this package.

    It provides a 2x barlow, so far so good

    Now barlow the 32mm and you have a 16mm, so take the 15mm off the list

    Now barlow the 9mm and you have a 4.5mm so take the 4mm off the list, and most importantly what is so often not considered is the eye relief with the lower end plossls. The 9mm barlowed will have more eye relief than the 4mm. no question, guaranteed. with these cheaper jobs your eyelashes will be brushing the glass to try to squint into the little hole in the middle.

    Filters. Well you will use all those wrattens two or three times to see what they are about, then put them in the box and forget the things. Maybe the 80 a will be useful on Jupiter and Saturn but don't forget that you have an ED scope.

    Lunar, well the ND Moon filter does work, but if you are serious with Lunar observing the purists will tell you every time that no filter is required. For mine, I do like to filter the moon but I find that a Variable Polariser is way more useful.

    So what do you buy?

    Your call. For your ED100 I could suggest that for top performance you need to pay at least $200 per EP, but to be realistic on your budget have a look at these.

    I am guessing that the scope came with a 25mm and 10mm plossl, so you will benefit with a half decent barlow, a 30mm EP and a 6mm EP. The Vixen NPL series are above average and offer 50 degree AFOV with acceptable eye relief. Chuck in a Lumicon VP filter for Lunar if you are keen on moon observing, and a half reasonable 2x barlow, say a GSO ED, or a Vixen, and you have spent about the same amount of bucks but you do have some reasonable quality instead of a box full of cheap bits that won't get used.

    Just my opinion, BTW

 

 

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