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Thread: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

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    Default Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!



    Hi All,
    I was incredibly lucky and scored a used Orion Skyview Pro 127mm Maksutove-Cassgrain to use while I am rebuilding the 10" Dob I recently acquired. Everything works and it is in excellent condition, with a couple very minor scuffs. Missing the toe-saver but a trip to Home Depot got me a stainless screw and a couple fender washers. Also missing the Dec knob, so I ordered one on ebay.

    I had been trying to decide between the Astromaster 130EQ and other similar scopes that go for $200 new. I thought I was stuck getting a new scope on Amazon (using gift cards) but I figured a way around that. Now this massively mounted scope (it's rated for up to a 20 lb OTA) is sitting next to me.

    I had never used an EQ mount and I also really struggled to align the viewfinder. After downloading the manual, I happened to notice from the photo that the viewfinder mount (not the finder itself) was on backwards! Reversed it and got it re-aligned in 5 minutes! I worked that EQ mount around the sky for an hour or two and WOW this is a NICE scope! I spent some time with the manual and youtube and can use the mount a lot easier now.

    So... questions: What eyepieces do you use with this scope? I'd really like a nice low-power eyepiece that will also work in my Dob. I have a 27mm but it is a very cheap one that was included with an $80 (new) telescope. Nevertheless it gave me a really impressive view of the Orion nebula.

    Someone posted that 28mm is max possible with this scope but I was wondering about a 32mm. I'd like to keep it under $50. I also have a Celestron Omni 15mm, and a Gosky 8mm.

    My money is extremely tight, so I'll probably only buy one EP and then spend any money I have on finishing the 10" Dob I'm working on. Eventually, I'll save up $140 for the drive motors for this. My daughter wants to snap some very basic photos. (Real AP is way beyond my budget, knowledge and interest level for now.)
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    Default Re: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    Hi lign, a very nice telescope Give this a read to help figure out some ideal focal lengths for your telescope.
    http://www.astronomyforum.net/astron...telescope.html
    lign likes this.
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
    Mounts: Manfrotto 055PRO, Celestron SLT, Celestron CG-5/ Argo Navis, Vixen SXP Binoculars: Celestron Eyepieces: A-Z

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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/Achro 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: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    Wow! All that for $200? Nice score!
    Macrob1 likes this.
    Bryan
    Scopes: Apertura AD12 f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; ES AR102 f/9.8; iOptron MC90 f/13.3; Orion ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Meade NG60 f/10
    Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen Polaris
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    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett Gemini 12×60 LW, Gordon 10×50, Apogee 20×100
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    Default Re: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    Wow, Nice find! I have never used that style of scope so am in no position to advice on EP's, I would love to hear how it works once you upgrade your ep's.

    Jimi
    10in Skywatcher Dob, Celestron C8 Sct, C6-NGT Celestron, Celestron 80mm EQ, Celestron 60mm AZ
    Celestron Neximage 5/ Canon T3 Rebel, 32mm, 25mm,,20mm,10mm,9mm,6mm Omni Plossal, 21mm 8mm Orion stratus

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    Default Re: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    Hi Gabby, That's an awesome article and definitely helps me a lot! Unfortunately it doesn't really answer my question. I have a decent handle on the high magnification side for my scope but I'm not trying to do that right now. Eventually I'll pick up a 6mm which will be about the limit (and will probably require rare, perfect conditions). What's the lowest magnification (longest focal length) EP I can get for my scope? Using your formula and plugging in a max exit pupil of 7mm yields an 85mm eyepiece. Obviously that won't work and I realize your article was not implying that it would.

    Someone posted that anything over 28mm in my scope will show the barrel of the scope in the view. I have no clue how to calculate this.

    My scope is 127mm diameter, 1,540mm focal length, and F/12.1. Will 32mm work? 40mm? Or would that require a 2" EP? Would 2" EP's work in my scope? I know this scope is best for lunar and planetary use (and I'm thrilled about that). I'd just like to also have the lowest power EP to make it as versatile as possible.

    Thanks so much!
    Last edited by lign; 01-14-2018 at 03:44 AM.

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    Default Re: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    The answer to your question will depend on the design of EP you intend to buy. The widest plossl design EP useful is a 32mm in the 1.25" format. Considering your future Dob in addition to using it in the Mak, I would get an ES 24mm 68. It would give you the widest possible field of view, would work wonderfully in the Dob, but is considerably above your budget.
    Macrob1 likes this.
    LX200 ACF 8"SCT, Apertura AD12, Celestron C6A SCT, SkyWatcher 120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60, Oberwerk 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount, Canon T5, Meade DSI2 Pro, Phillips cam, Explore Scientific 30mm, 24mm, 18mm, 14mm, 11mm, 8.8mm, 6.7mm 82 degree EPs, ES 24mm, 20mm, 16mm 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader Moon&SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.

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    Default Re: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    Wow, I see I have a LOT to learn! After thinking about this a bit and remembering that there are 25.4mm's in an inch, I don't understand how a 32mm EP can physically fit into a 1.25" hole! Ozman, is that why you said the 24mm would give the widest possible FOV?

    I don't know what design of EP I want. I guess I want the widest possible true FOV. A wide apparent FOV would be nice but my budget is really low.

    How can I tell the widest that is possible in my scope? Is it limited to the 1.25 or would a 2" let me go lower?

    Any thoughts on the Celestron Omni 32mm?

    https://www.amazon.com/Celestron-Omn...+1.25+eyepiece

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    Default Re: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    It has to do with the eyepiece field stop size and AFOV of the eyepiece. The 24mm has almost the same TFOV as a 32mm but the magnification of the 24mm will give you a larger image.
    The maximum FOV of the telescope is 1.03° and as far as I know your telescope is limited to 1.25" eyepieces.

    For the price/ quality of the Celestron Omni I would go with the GSO Plossl: https://agenaastro.com/eyepieces/1-2...grees/gso.html
    Last edited by Gabby76; 01-14-2018 at 04:43 AM. Reason: Added information
    Macrob1 likes this.
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
    Mounts: Manfrotto 055PRO, Celestron SLT, Celestron CG-5/ Argo Navis, Vixen SXP Binoculars: Celestron Eyepieces: A-Z

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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/Achro 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: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    For a budget EP, the 32mm plossl will work fine and give you as wide a field possible in 1.25". Unfortunately your scope will not benefit from 2" EPs because of the size of the baffle at the rear cell.
    Gabby76 likes this.
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    Default Re: Got an Orion Skyview Pro 127 Mak-Cass for $200 and have some questions!

    Good advice from Gabby and Ozman. I have a Skywatcher 127 Mak and the 32mm Plossl provides very pleasant wide-field views, but because of the scope design there will be some objects that are just too big.

    Enjoy your bargain buy scope
    Bob

    Scopes: Skywatcher Star Discovery Mak 127 + SW 9x50 RACI on SynScan alt/az go-to mount; Saxon ST80; Bintel (GSO) 8" dob Eyepieces: SW kit 25mm, Starguider Dual ED 8mm and 15mm, SW 19mm flat field, SW 32mm Plossl, Vixen NLV 20mm, Svbony 12.5 mm illuminated reticle Barlows: SW 2x, Celestron Omni 2x Binoculars: Acuter 15x70, Olympus 10x50 DPSI

 

 
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