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Amazing morning for Newbies

Discussion in 'Observing Celestial Objects' started by Pleiades, Sep 19, 2017.

Amazing morning for Newbies

Started by Pleiades on Sep 19, 2017 at 3:58 AM

9 Replies 1782 Views 1 Likes

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  1. Pleiades

    Pleiades Well-Known Member

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    Pleiades, Sep 19, 2017
    #1
    Amazing.
    The morning started at 4:00 with a pair of Celestron 10x50's. Plieadies, Hyades Cluster with Aldebaran and all her beauty. I split the double-double, in Lyrae, and spent time on the Andomedia Galexy. By now I had moved to the 60mm with a Svbony 40mm. Once zeroed in on Orion's Nebula, I switched up to the 20mm GSO. The Orion Nebula, what an incredible sight.
    Then I got over excited, and moved down to the dirt road, for a better view over in Cassiopeia. I completely forgot about the motion activated flood lights. No worries. It's almost six and the sky is getting light anyway. Time for coffee.

    Note: SvBony 40mm Not impressed I got what I paid for.
    GSO 20mm, Now this was a bargin! I'll be buying more GSO Eyepieces.
     
    Dave In Vermont likes this.
  2. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, Sep 19, 2017
    #2
    Sounds like a great night. So, what was it about the 40mm SvBony you disliked so much?
     
  3. Pleiades

    Pleiades Well-Known Member

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    Pleiades, Sep 19, 2017
    #3
    Too much eye relief. From what Man tells me, I probably just don't like 40's too much.
     
  4. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, Sep 19, 2017
    #4
    Yeah, they can be hard work. They're very useful with large SCT's, Celestron include a 40mm Plossl with most of their big cat's.
     
  5. Pleiades

    Pleiades Well-Known Member

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    Pleiades, Sep 19, 2017
    #5
    I'll keep mine as a finder eyepiece.
     
  6. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, Sep 19, 2017
    #6
    You'd probably be better off with a bog standard 32mm Plossl with a 50° AFOV. I find 40mm Plossls are useful if you really need an exit pupil wide enough to use certain filters. 40mm Plossls have a limited FOV.
     
  7. Pleiades

    Pleiades Well-Known Member

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    Pleiades, Sep 20, 2017
    #7
  8. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, Sep 20, 2017
    #8
    That's an awful Erfle pun ROTFL!

    Yes, a 32mm Plossl should give a TFOV of 2 arc degrees (approx 4 Full Moons) with your scope (25x). A 25mm, 68° EP should give 2°, 7“, 30' (32x).

    The exit pupil of the 32mm Plossl will be 2.4mm and the 25mm EP will give 1.9mm.

    There isn't much between the exit pupil sizes. Traditionally an exit pupil of between 2 ~ 4mm is best for DSO's. To utilise some broadband filters you would need at least a 3mm (or greater) exit pupil.
     
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  9. Pleiades

    Pleiades Well-Known Member

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    Pleiades, Sep 20, 2017
    #9
    thanks. huge help
     
  10. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, Sep 20, 2017
    #10
    You're welcome.
     

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