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Thread: Help me finialize my next EP purchase

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    Default Help me finialize my next EP purchase



    So I'm down to either getting the ES 14mm or 18mm 82 deg as my next EP. Given my 9.25", F/10 SCT anyone want to push me in one direction or the other? I know I'm probably splitting hairs here but I've read that an optimum exit pupil for DSO hunting is about 2.0 but also you'd like a mag around 150 or more. These 2 EPs produce mags of 130x - 167x & exit pupils of 1.8 & 1.4 respectively so I'm not really sure which aspect is more important, if either?
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    Default Re: Help me finialize my next EP purchase

    I'm guessing that since I already have a 12.5mm Ortho & a 'cheap' 25mm that came with the scope the 18mm would be a better choice?
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 1989
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    UO 4mm Ortho, KK 9mm & 12.5MM Orthos, Delite 7mm, Delos 10mm, 14mm, Panoptic 19mm, 24mm, Baader 8-24mm Mark IV Zoom, Nikon D5300 & a bunch of NV stuff

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    Default Re: Help me finialize my next EP purchase

    You can tell by my signature how I feel about these EP's.
    The 18mm is a great EP. I do not have your scope so can't give you an opinion. But when I purchased my EP's, I tried to separate them as I felt necessary.
    I usually hunt with my 30mm (wow, what an EP), then switch to the 18mm, then down to the 11mm and then 8mm.
    Many will separate their EP's even tighter, but for me, I use the above. Personally, I don't feel it necessary to have an 18mm, 14mm and then 11mm. Too close for ME. Depends on how serious you want to view.

    You mention having a 12 Ortho and although a great EP, it's not 82* which makes a big difference in my opinion.
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    Default Re: Help me finialize my next EP purchase

    Any plans to add a focal reducer to your SCT? I wonder if that might impact your final decision?

    Just thinking out loud. I have minimal SCT experience...

    I do love my ES 82º eyepieces, though.
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    Bryan

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    Default Re: Help me finialize my next EP purchase

    not really. I was advised that if I planned to go with a 2" prism diagonal so I could use 2" EPs that I wouldn't need a FR since 2" EPs would give me all the wide FOV I would need. I was told either a FR or 2" capable diagonal but no need for both .... was that good advise? Also, I already have a one 2" EP, the GSO 42mm Superview ...however, it nmay not really be high enough mag for hunting DSOs?
    Last edited by Nimitz; 05-30-2017 at 08:41 PM.
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 1989
    What do I have? A M.S. degree in AstroPhysics w/minor in planetary geology
    XX14g SkyQuest GOTO Dob; WO 81GT APO triplet; SkyWatcher EQ-6R Pro
    UO 4mm Ortho, KK 9mm & 12.5MM Orthos, Delite 7mm, Delos 10mm, 14mm, Panoptic 19mm, 24mm, Baader 8-24mm Mark IV Zoom, Nikon D5300 & a bunch of NV stuff

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    Default Re: Help me finialize my next EP purchase

    I guess another way to ask this question is what magnification do people tend use for DSO hunting?
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 1989
    What do I have? A M.S. degree in AstroPhysics w/minor in planetary geology
    XX14g SkyQuest GOTO Dob; WO 81GT APO triplet; SkyWatcher EQ-6R Pro
    UO 4mm Ortho, KK 9mm & 12.5MM Orthos, Delite 7mm, Delos 10mm, 14mm, Panoptic 19mm, 24mm, Baader 8-24mm Mark IV Zoom, Nikon D5300 & a bunch of NV stuff

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    Default Re: Help me finialize my next EP purchase

    Quote Originally Posted by Nimitz View Post
    not really. I was advised that if I planned to go with a 2" prism diagonal so I could use 2" EPs that I wouldn't need a FR since 2" EPs would give me all the wide FOV I would need. I was told either a FR or 2" capable diagonal but no need for both .... was that good advise? Also, I already have a one 2" EP, the GSO 42mm Superview ...however, it nmay not really be high enough mag for hunting DSOs?
    I use a Televue Panoptic 35mm for DSO's on My Nexstar 8SE I also have used the GSO 42 I have for wider fields when I was looking at the Leo Triplet and wanted to see a bunch of DSO's. You will find that if you want to view more then try the 42 GSO to find it and when you see what you want center it then switch to say an 18mm. That ratio of difference does have some advantages. If the skies are very dark this is particularly effective. Clear skies and good hunting.

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    Default Re: Help me finialize my next EP purchase

    There is a 2.5 mm difference in eye relief, so if that is an issue for you be sure that the 18 won't be too tight (13mm) for you to use comfortably over long periods of observation. There are several threads in our eyepiece forums that have extensively discussed the ES 82 degree eyepieces, so you might check them out too.

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    Default Re: Help me finialize my next EP purchase

    Quote Originally Posted by Nimitz View Post
    I guess another way to ask this question is what magnification do people tend use for DSO hunting?
    It depends on the DSO! The size and degree of contrast with respect to the sky background determines optimum magnification. But it is best to think in terms of exit pupil since that transfers from scope to scope. For instance the Horsehead Nebula needs a 5mm exit pupil. So on my 9.25 Edge that means a 50mm focal length. My Takahashi 50mm LE pseudo Masuyama is ideal (and an H beta filter helps).

    For small galaxies a 10 mm eyepiece is best. One eyepiece does not fit all DSOs. So if I want a wide field I'll use the ES100 9mm, a TV Plossl 11 mm (especially if it might be hard to detect), a 10mm BCO if I want to see as much internal detail as possible, or (now that I have them) the KK Orthos at 12.5 or 9mm at the high end. If I want wider field than an Ortho or Plossl provides the 10mm Delos is excellent.

    Many people like the 82 degree format. I don't. I had two sets of Naglers and couldn't stand them. So I'll stick to Plossls and Orthos for detection (more light throughput) or if I want a bit wider for framing purposed I'll go for Delos or Panoptic which don't distort as much as the 82s or I'll really go wide for the 100 degree format.

    Lower magnification is often useful as well. Buy one, sure. But you'll need more down the road when you realize that one is not suited for every object.

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    Default Re: Help me finialize my next EP purchase

    Quote Originally Posted by not_Fritz_Argelander View Post
    It depends on the DSO! The size and degree of contrast with respect to the sky background determines optimum magnification. But it is best to think in terms of exit pupil since that transfers from scope to scope. For instance the Horsehead Nebula needs a 5mm exit pupil. So on my 9.25 Edge that means a 50mm focal length. My Takahashi 50mm LE pseudo Masuyama is ideal (and an H beta filter helps).

    For small galaxies a 10 mm eyepiece is best. One eyepiece does not fit all DSOs. So if I want a wide field I'll use the ES100 9mm, a TV Plossl 11 mm (especially if it might be hard to detect), a 10mm BCO if I want to see as much internal detail as possible, or (now that I have them) the KK Orthos at 12.5 or 9mm at the high end. If I want wider field than an Ortho or Plossl provides the 10mm Delos is excellent.

    Many people like the 82 degree format. I don't. I had two sets of Naglers and couldn't stand them. So I'll stick to Plossls and Orthos for detection (more light throughput) or if I want a bit wider for framing purposed I'll go for Delos or Panoptic which don't distort as much as the 82s or I'll really go wide for the 100 degree format.

    Lower magnification is often useful as well. Buy one, sure. But you'll need more down the road when you realize that one is not suited for every object.
    Ignore this. I'm tired and made many errors writing.
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