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  1. #1
    laupd's Avatar
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    Question Celestron 8" GPS Eyepiece advice



    Hi
    My first post!

    Just become the proud owner of theabove scope and have a Celestron 30mm eyepiece. I'm an avid beginner and no expert!

    I want to see as many objects as possible, but don't have a specific target type in mind. I'm considering a zoom eyepiece upto 200 pounds. Can anyone recommend the best one for this type of scope plz.

    Thanks,
    Paul

  2. #2
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    Default

    Have a look at the Baader Hyperion zoom. All the zooms I've seen have a smaller apparent field of view at the low magnification end (that is, the size of the circle you see the image in is smaller) but the baader manages to keep a decent size, unlike some of the cheaper zooms.

    You may also want to consider adding one of the f6.3 reducer/flatteners for a wider view, and/or a 2" diagonal and a 2" 40mm or 30 mm or so ultrawide. Not much point in looking at a 40mm in 1.25" since the barrel will limit you to around the same true FOV as your 30mm.
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
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  3. #3
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    Oh - and welcome to the forum

    SCTs are relatively slow scopes at f10, so most budget eyepieces will work well with them - fast scopes are more demanding.

    If you haven't already got one, a dew shield is probably a good idea too. The plastic wraparound ones are fine , or you can improvise something
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
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    Joe Lalumia (03-29-2012)

  5. #4
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    I'm not a zoom guy and I'll tell you flat out that the Hyperion and the Pentax 8-24 zoom are the best on the market (and the price of the Hyperion is ONLY 3 to 4 times the price of a Celestron,Meade, or Zhumell zooms and that price is only half of what the Pentax sells for...

    That said...I do own a C8 and a CPC1100 ...BUT I use a CHEAP Celestron Zoom to use in my 4 inch refractor at outreach events my club uses fro boy scout meetings and other public viewing we hold ... ( I do this because kids seem to love touching the glass of the eyepieces) .. ANYWAY it preforms "ok" in my C8 never used it in my C11 ...

    Bottom line..an inexpensive zoom will hold your attention until you can buy better individual eyepieces that suits you needs...

    BTW... with my C8 I find that I have a 26 31 or 35 mm (all wide field 2 inch eyepieces) in the diagonal 80 percent of the time... my next three most used eyepieces are a 13 and 17 mm and 20 ... it is extremely rare for me to use a 10 and the highest power eyepiece which gets used on very very occasionally on the moon only....

    Bob G.
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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  7. #5
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    Default

    Like Bob I also prefer individual eyepieces. But the Hyperion Zoom is a good one to own as it will get you going with almost a complete set of magnifications.

    However you will want to buy at least one low power wide field eyepiece in the 30mm- 40mm range eventually.

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    All,
    Thank you very much for your time and advice everyone! Clearly there isn't one simple answer and everyone's needs and views are different. I'm expecting to spend some time using this scope with my 10 year old daughter who has a keen interest. Seeing more quickly and keeping her interest was part of my 'zoom' thinking.

    I am going to look out for a Pentax or baader zoom to start with, but then add a 2" diagnosis and buy some 2" eyepieces of the lengths I use most. Sounds like a reasonable plan?

    A dew sheild.... Good idea! I think I can make one, will see how it goes.

    Currently away on business so can't try it out! Frustrating! Back next Wednesday.... Hope it's a Clearly nicht!

    Paul

  9. #7
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    Sounds like a reasonable plan; I'm another one who tends to prefer fixed eyepieces to zooms - while a zoom is convenient, there's less hassle involved in changing eyepieces with a driven scope than there is on something like a dob - you don't have to worry about your object drifting away while you're switching eyepieces . Probably worth pointing out that there's no optical advantage with 2" eyepieces at shorter focal lengths, since you're just magnifying the central part of the image and a 1.25" barrel isn't a limiting factor - but a number of brands have a 1.25" barrel with a 2" lower body so you can use them directly in a 2" focuser, which can be a bit more convenient than dropping the 1.25" adapter back in, but it's not a big deal either way.
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
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