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Thread: Eyepiece choice for 8 SCT

  1. #1
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    Default Eyepiece choice for 8 SCT



    Hi all, 2nd scope but First was a rubbish 114eq I was given as a gift. Fun but poor.

    Debating Celestron C8 SCT ON VX mount. Not ruled out the EdgeHD version.
    Think the nexstar 8se & Evo AltAz mount would annoy me re movement, & want occasional AP capacity so need to be able to mount DSLR (hence VX mount). Thisll come down to the Wife agreeing extra cash lol.

    Im totally lost on eyepieces though.
    I want one for planets (8-10mm) thinking ES 82 8.8mm or Celestron Ultima Duo 8mm. The latter easy for sticking DSLR on the back. The ES has wider AFOV (82 v 68) but does this really affect the TFOV? at 8mm??

    Then I need a midrange 14-16mm (maybe Luminos 15mm?) and a wide EP (ideally as wide as I can get on the 1.25 diagonal. This seems harder!! TeleVue 32 Plossl is apparently king of FOV at 1.25, but are there any others get me close to the maximum FOV possible? It seems on a 1.25 Im limited to what... 0.8 TFOV. Any lens suggestions to get as close as possible?? (In the 75-120 Range as the TeleVue is about 130 & other have suggested 300 lenses which is a no go!)

    Any SCT users with experience your input would be very helpful! Thanks!

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    Default Re: Eyepiece choice for 8 SCT

    Quote Originally Posted by Stave84 View Post

    I’m totally lost on eyepieces though.
    I want one for planets (8-10mm) thinking ES 82 8.8mm or Celestron Ultima Duo 8mm. The latter easy for sticking DSLR on the back. The ES has wider AFOV (82 v 68) but does this really affect the TFOV? at 8mm??
    Once you get beyond 68 degree you are paying for FOV you are not using. The basic design used by the Duo ( Baader Hyperion and Orion Stratus) do very well in SCTs. With higher powered eyepieces - especially for planetary viewing FOV is not a consideration. Even FOV as tight as 40-50 degrees will frame any planet very nicely.

    To get wider FOV I went with the Celestron focal reducer. This largely made a 32mm eyepiece irrelevant, and allowed me greater flexibility with smaller eyepieces to achieve the same views. At 1.25 barrel size, there were not many options in the 32mm range.
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    Default Re: Eyepiece choice for 8 SCT

    I rarely use an EP in the 6-8mm range in my C8s. Seeing conditions must be very favorable to do so. Most of the time I am using 17 -13mm for high magnification and for a FOV EP somewhere in the 21-35mm range. I also have the standard C8 and the Edge HD and the Edge HD is definitely the better of the 2 scopes. If you can afford the extra expense, I don't think you will be disappointed.

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    Default Re: Eyepiece choice for 8 SCT

    For my C8, the primary EPs I use are the Baader Planetarium 10mm Hyperion, the Explore Scientific 18mm 82deg, and the Orion 38mm SWA all using a 2" Williams Optics SCT diagonal. I also have the .63 focal reducer which I use occasionally. The Baader Hyperion works in 1.25" or 2" diagonals, the other 2 are strictly 2" EPs. I also use an illuminated crosshair EP for alignment. I have EPs in the 4mm-8mm range but have never had sufficiently excellent conditions to get anything out of them, the 10mm is the smallest I have had good luck with.

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    Default Re: Eyepiece choice for 8 SCT

    I use Radians with mine along with nice Ortho pairs of 32-8mm with binoviewers. Really quite amazing views. For superwide I use a 56mm Russel Optics Plossl
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    Default Re: Eyepiece choice for 8 SCT

    If it were me, I'd get a focal reducer, a 2" SCT diagonal, and a few ES 82 degree EPs (nothing shorter than the 8.8mm) The three I would want to be sure I had would be the 11mm, 18mm, and 24mm. The 30mm is HUGE but VERY wide and my 14mm sees lots of use as well.

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    Default Re: Eyepiece choice for 8 SCT

    The used market can stretch you budget and eyepieces have no moving parts, so they simply need to be in good shape to be a safe bet as a used purchase. Narrow versus wide views is more of an individual preference than a quality issue, but the wider views only hold all aspects of image quality in the highest price models. Unless you need to view extended objects as complete entities (which is not the forte of a CAT), I would be content for a first set of quality EP's to go for three good KK or Baader Orthos (a 10mm to 12mm, a 16 to 20mm, and 26 to 32mm)which will serve you forever as maximum sharpness, contrast, and throughput eyepieces.

    Once you have used them for a while, pick the focal length that you find most frustrating for its lack of field size, and get that length as a 72, 76, or 82 degree model. Remember also that a 1.25 inch eyepiece that is longer than 32mm will not increase the field size, but it will reduce magnification to reveal fainter targets even if they are difficult to pick out of the lighter background sky. This is why the ultimate solution will be a 2" dielectric diagonal, but the 40 or 50mm 1.25" Plossl is cheap and can serve well as a stop gap measure for seeing extended objects.
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    Default Re: Eyepiece choice for 8 SCT

    I find I get the most use from two eyepieces. I have a GSO 30mm, 2" and a GSO 9mm. Along with those two eyepieces I use barlows. This effectively gives me 6 eyepieces:

    -30mm, 2" (great for sightseeing and for nights of fair seeing)
    -20mm, 2" (Take the lens from the 2" barlow and attach it to the 30mm. I use this for sightseeing on nights of good seeing.)
    -15mm, 2" (I find this is the sweet spot for power.)
    -9mm, 1.25" (Mostly Lunar and planetary.)
    -6mm, 1.25" (Use the lens from the barlow on the eyepiece. I use this mostly on doubles.)
    -4.5mm, 1.25" (Use for tight doubles and fine collimation on an artificial star.)

    *I have found that this f10 scope is very forgiving of modest quality eyepieces. I've done shootouts with some friends very high quality eyepieces. They provide my old eyes only a slightly better view. I find the same is true for my Meade 10" sct and my c102mm (f9.8) refractor. My ES 152 (f6.5?) appreciates the difference in quality a little more.

    Tom
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