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Thread: deal alert and questions

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    Default deal alert and questions



    For anyone looking for a good deal for eye piece investments, B&H is currently offering the ES 82º set for $670, instead of the usual $850 price. Very significant discount (although you'll have to pre-order, they're not in stock yet).

    After lots of discussions and feedback, I think I decided to get some of these myself, to work better in my (on the way) 8" dobsonian. I don't think I'll go for the whole set though. I was thinking of getting the 24mm, which would likely turn into a wide field work horse (50x magnification, 1.64º FOV), and one other. There in lies the tricky decision: which other one? This is a silly question, but do most people end up using as there "medium" magnification? I am thinking mostly hunting for DSOs. Right now I am debating between the 14mm (~ 85x) and 11mm (110x). And I am considering the option to Barlow it for high power, which would be an additional consideration. But realistically I would probably end up using it a lot at native FL, for more detailed DSO looks. Anyone want to share their experience on what they find the most rewarding as their medium magnification? Understanding much of it is personal preference.

    Thanks!
    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.

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    Default Re: deal alert and questions

    And to show that your advice is not wasted on me, I did then realize that it was more about exit pupil. 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 - probably what I mostly need to target. In an f/6 scope, that likely gets me to about 10 mm, so I think the 11 would be good. And Barlowed it would give me 5.5, so about a 0.9mm pupil, for higher mag. Does this sound about right?
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    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.

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    Default Re: deal alert and questions

    I have the complete set of these. My favorites in the series with my 12” dob are the 18mm (84x) and the 11mm (138x).

    These two get the most use by far with my dob. The 14mm and the 8.8mm come in behind those other two. 24mm is wonderful as sees use as well.

    The 30mm kicks up a large exit pupil in the dob, but makes a wonderful eyepiece in my short 5” refractor.
    Bryan

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    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
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    ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
    Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen
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    Eyepieces: GSO Super Plössl 40mm, 32mm, 15mm, 9mm; ES 82° Series; GSO Superview 30mm; Celestron Plössl 26mm, 20mm; ES 70° 25mm; ES Plössl 25mm; Vite Aspheric 23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; KK Ortho 18mm, 12.5mm; Bresser 70° 15mm; Coulter Optical 12.5mm; BCO 10mm; ES 62° 9mm; Zhumell Z Series 5mm
    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett
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    12×60 LW, Gordon 10×50, Apogee 20×100

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    Default Re: deal alert and questions

    That looks pretty good rocdoc. Did I ever send you that article on exit pupil/ targets?
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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    Default Re: deal alert and questions

    If I could deal with the low eye-relief and the field of vision issues I would be all over that.

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    AD8 w/HALO
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    Default Re: deal alert and questions

    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".
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    Default Re: deal alert and questions

    Thank you all! Gabby, I don’t think you did - and I would be most grateful!
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    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.

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    Default Re: deal alert and questions

    Sent you a PM
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    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: deal alert and questions

    Quote Originally Posted by Gabby76 View Post
    That looks pretty good rocdoc. Did I ever send you that article on exit pupil/ targets?
    I think that article should really be stickified so it's readily available. Just do it, please?

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    Default Re: deal alert and questions

    Quote Originally Posted by rocdoc View Post
    And to show that your advice is not wasted on me, I did then realize that it was more about exit pupil. 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 - probably what I mostly need to target. In an f/6 scope, that likely gets me to about 10 mm, so I think the 11 would be good. And Barlowed it would give me 5.5, so about a 0.9mm pupil, for higher mag. Does this sound about right?
    Well I rather DO think my advice is wasted. As I remarked 2mm exit pupil is the critical one for optimizing resolution and contrast. So good luck.

    https://www.astronomics.com/eyepiece-exit-pupils_t.aspx
    Last edited by not_Fritz_Argelander; 02-15-2018 at 06:51 PM.
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    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
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