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Thread: deal alert and questions

  1. #11
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    Default Re: deal alert and questions



    Quote Originally Posted by Don Alvarez View Post
    The Superview that comes with your scope will probably serve well as a widefield EP for some time. It's going to give you an exit pupil of 5 and a generous true field (I hope I'm using that right I get true vs apparent mixed up) of about 1.7° at 40x, if this online calculator I'm using can be believed. I'd recommend you at least use this first before you consider replacing it.

    So... (didn't we just have thread about sentences that begin with so?)

    THEREFORE, I would focus more for now on the EP thats probably going to get the second most use and a role that more immediately needs filling, which would probably be medium power. For me personally I use a 14mm which gives me about 89x. However I think the universal understanding of the ES 82° line seems to be the 18mm is the cream of the crop, so I'm not sure you'd want to skip that one. I've heard it labeled a "galaxy killer".
    So, I'm sitting here thinking that I agree with you. Therefore, I suggest that RocDoc stick with that Superview for a wide angle eyepiece for a while.

    So, now it comes time for my mid-range EP suggestion...

    If God pointed a gnarly finger down from the clouds and decreed, "John, from this day forth you may only have one eyepiece for your Dob." I would pick the 2" ES 82 degree 18mm and be a happy camper. That one is a keeper for sure.

    So, I wish you all clear, dark skies.
    John (Urban Astronomer) Apertura AD10 Dob; XLT 150 Dob; XLT 120EQ; Lunt Solar 60 PT/B1200; ES AR102; SW Pro 100ED; 2 SW Pro 80ED's; 90mm Eq; WO Z-61; SW 90mm Virtuso Mak; 2 Orion ST-80's; Quark-C; Cams: ASI120MM-S, ASI174MM & ASI174MM-cooled

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  2. #12
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    Default Re: deal alert and questions

    Not to gloat, but Gabby's article is indeed awesome, and now I have it!
    n_F_A, ouch, why do I feel like I'm back in high school suddenly? I don't think I was that far away from that, and the two EPs I'm debating between straddle the 2mm mark - 1.83 and 2.33 respectively.
    It's interesting, within a range that everyone lists, I wonder if the TFOV of the EP can balance the choice (in addition to one's own pupillary dynamics, obviously), from the standpoint of the view at the eyepiece, not the exit pupil (which we have established is the first factor to consider). Meaning, since I am looking at fields on the wider side (82º), would it then make sense to err on the side of higher magnification, since I don't trade off as much of the FOV in that case? Or is this another nonsensical proposition on my part?
    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
    Other instruments: Skyline 8" Dobsonian; Celestron Omni XLT 120 w upgraded focuser and diagonal on Stellarvue M2C mount; Oberwerk 25x100 IF; Celestron SkyMaster 8x56. Main EPs: ES 82º 24mm and 11mm, Celestron Luminos 19mm, Meade UWA 14mm, Meade HD-60 6.5mm. Filters: UHC, 13%, blue. Finders: RACI, Telrad, RDF, reticle.

  3. #13
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    Default Re: deal alert and questions

    Quote Originally Posted by rocdoc View Post
    n_F_A, ouch, why do I feel like I'm back in high school suddenly? I don't think I was that far away from that, and the two EPs I'm debating between straddle the 2mm mark - 1.83 and 2.33 respectively.
    Perhaps you feel like you are back in high school because you are making an ad hominem remark? That qualifies for high school. The 1.83 is perhaps close enough for a game of horseshoes but the 2.33 isn't.

    The remark that I find indicative that I have wasted too much time is
    It seems that most people think around 5 is good for wide field views, and around 1.5 or a bit more for low surface brightness small objects
    Most people think 2mm as I indicated not 1.5mm. There is some science to it. Then there is this:

    It's interesting, within a range that everyone lists, I wonder if the TFOV of the EP can balance the choice (in addition to one's own pupillary dynamics, obviously), from the standpoint of the view at the eyepiece, not the exit pupil (which we have established is the first factor to consider). Meaning, since I am looking at fields on the wider side (82º), would it then make sense to err on the side of higher magnification, since I don't trade off as much of the FOV in that case?
    The answer is no. So as to spend minimal time.

    Or is this another nonsensical proposition on my part?
    Yes.
    Last edited by not_Fritz_Argelander; 02-15-2018 at 07:33 PM.
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  5. #14
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    Default Re: deal alert and questions

    Quote Originally Posted by rocdoc View Post
    Not to gloat, but Gabby's article is indeed awesome, and now I have it!
    n_F_A, ouch, why do I feel like I'm back in high school suddenly? I don't think I was that far away from that, and the two EPs I'm debating between straddle the 2mm mark - 1.83 and 2.33 respectively.
    It's interesting, within a range that everyone lists, I wonder if the TFOV of the EP can balance the choice (in addition to one's own pupillary dynamics, obviously), from the standpoint of the view at the eyepiece, not the exit pupil (which we have established is the first factor to consider). Meaning, since I am looking at fields on the wider side (82º), would it then make sense to err on the side of higher magnification, since I don't trade off as much of the FOV in that case? Or is this another nonsensical proposition on my part?
    Definitely 1.83mm. I have 8" telescope (SCT) and EPs to produce 1.8, 2.0 and 2.4mm exit pupil. It is a tough call between 1.8 and 2.0, but I can definitely tell, that on faint galaxies both deliver better contrast then 2.4mm.

    Also, ES82 11mm is one of the best in ES82 line, but 14mm is the weakest. In fact if you decide to go after 14mm I suggest to get Meade 5000 UWA instead of ES82.
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    Default Re: deal alert and questions

    Quote Originally Posted by not_Fritz_Argelander View Post
    Perhaps you feel like you are back in high school because you are making an ad hominem remark? That qualifies for high school. The 1.83 is perhaps close enough for a game of horseshoes but the 2.33 isn't.

    The remark that I find indicative that I have wasted too much time is

    Most people think 2mm as I indicated not 1.5mm. There is some science to it. Then there is this:



    The answer is no. So as to spend minimal time.



    Yes.
    Very grateful to everyone posting helpful advice of course.
    I will politely disagree with my response being an ad hominem remark, but I believe yours could definitely qualify. Again, I appreciate any time, minimal or a lot more, that you (and anyone else) have spent replying to any of my posts, but I certainly don't want to cause an inconvenience, and I certainly don't appreciate when that inconvenience manifests itself as an escalating or confrontational tone. I will therefore politely ask that you not reply further to any of my threads. Much appreciated, as always.
    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
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  8. #16
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    Default Re: deal alert and questions

    Quote Originally Posted by rocdoc View Post
    Very grateful to everyone posting helpful advice of course.
    I will politely disagree with my response being an ad hominem remark, but I believe yours could definitely qualify. Again, I appreciate any time, minimal or a lot more, that you (and anyone else) have spent replying to any of my posts, but I certainly don't want to cause an inconvenience, and I certainly don't appreciate when that inconvenience manifests itself as an escalating or confrontational tone. I will therefore politely ask that you not reply further to any of my threads. Much appreciated, as always.
    It's OK. I reject the idea that your "high school" remark was not an ad hominem. You raised the point of wasting time yourself with
    And to show that your advice is not wasted on me, I did then realize that it was more about exit pupil.
    No worries about further responses. You are on my "ignore list". I choose to avoid wasting time.

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    Default Re: deal alert and questions

    Quote Originally Posted by not_Fritz_Argelander View Post
    I think that article should really be stickified so it's readily available. Just do it, please?
    If the other mods agree to it I will sticky it in the eyepiece section.
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  10. #18
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    Default Re: deal alert and questions

    Quote Originally Posted by Gabby76 View Post
    If the other mods agree to it I will sticky it in the eyepiece section.
    Great!

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    Default Re: deal alert and questions

    Quote Originally Posted by Gabby76 View Post
    If the other mods agree to it I will sticky it in the eyepiece section.
    Should have been made a sticky long time ago! Thanks Gabby.

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    Default Re: deal alert and questions

    The ES 18mm 82 degree eyepiece is my favorite as well, though the 30mm SuperView Erfle still logs a lot of time in the Z10.
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    Michael
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