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Thread: Second hand saxon 90mm replacement diagonal

  1. #11
    Gabby76's Avatar
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    Default Re: Second hand saxon 90mm replacement diagonal



    Some extra information starting in post #4 here: Fast achro...mirror diagonal vs prism??
    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
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    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)
    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  2. #12
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    Default Re: Second hand saxon 90mm replacement diagonal

    Quote Originally Posted by Gabby76 View Post
    Love my Zeiss/ Baader prism for planetary. The views are outstanding.
    I've thought about a prism for the Tasco 10TE f/16. But the scope is rarely used so I haven't made a move. It sure does a great job on the planets though.
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  3. #13
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    Default Re: Second hand saxon 90mm replacement diagonal

    Quote Originally Posted by Gabby76 View Post
    Love my Zeiss/ Baader prism for planetary. The views are outstanding.
    I'm quite partial to my own as well. I use the Celestron for my achromats. The Zeiss is for the 4" refractor.
    "Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy!
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    ! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.


    Alan - Refractors: Takahashi FS-102 f/8, Meade 90mm f/10, Antares 80mm f/6, Celestron 70mm f/13, Sears 50mm f/12; Newtonians:
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    6" f/5, Meade 114mm f/8, Zhumell 100mm f/4; Mounts: "Deluxe" CG-2, EQ-2, AT Voyager I; eyepieces, barlows, and diagonals

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    Default Re: Second hand saxon 90mm replacement diagonal

    I have gone with the gso, if I find it serves my purpose I will keep using it. My main is a 16" lightbridge which isn't always handy for a quick look. It is still my preferred scope. I will use the refractor when time pressed or take away for the weekend. As originally stated, what i have is useless so this one should be a vast improvement. I will post with my thoughts when I have used it. Can't wait to use my starguiders with this scope but haven't got it home yet.
    16" Lightbridge
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    on eq mobile platform. 30mm 10mm 7.5mm Celestron plossls, 26mm 2" Meade qx, 30mm 42mm 2" GSO SV. 8mm 12mm 18mm 25mm Starguider, 1.8x Televue 1.25"
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    . 10x50 Tasco binoculars, 15x70 Celestron binoculars. Saxon 909 f10 refractor AZ3

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    Default Re: Second hand saxon 90mm replacement diagonal

    Quote Originally Posted by Gabby76 View Post
    Some extra information starting in post #4 here: Fast achro...mirror diagonal vs prism??
    Your link dead-ended. Here it is...

    Fast achro...mirror diagonal vs prism??

    Although, it is important to note that at f/10, an achromat is considered to be rather slow, than fast.
    "Look, son! Up there!" His son shouted back, "I see it! What is it?" The father regaled, "The galaxy!
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    ! Our origin, our destiny!" And so the boy was hooked, and for the rest of his natural life.


    Alan - Refractors: Takahashi FS-102 f/8, Meade 90mm f/10, Antares 80mm f/6, Celestron 70mm f/13, Sears 50mm f/12; Newtonians:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    6" f/5, Meade 114mm f/8, Zhumell 100mm f/4; Mounts: "Deluxe" CG-2, EQ-2, AT Voyager I; eyepieces, barlows, and diagonals

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    Fleegal (08-28-2018)

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    Default Re: Second hand saxon 90mm replacement diagonal

    Just an update, I purchased the gso mirror diagonal. I spent a bit of time checking the collimation of this refractor. The focus tube was drooping significantly. I corrected this and then put the diagonal in. Collimation was quite a bit out. This one has a mirror glued to a plastic backing plate. I loosened the 4 screws and shimmed one corner until the collimation was really close.

    This morning I turned the telescope towards the moon. Looking at the terminator, craters were sharp, shadows were vivid and I couldn't detect any aberration. In all, I am very happy with this purchase. The telescope is now performing close to it's potential.
    Ozman13 and Gabby76 like this.
    16" Lightbridge
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    on eq mobile platform. 30mm 10mm 7.5mm Celestron plossls, 26mm 2" Meade qx, 30mm 42mm 2" GSO SV. 8mm 12mm 18mm 25mm Starguider, 1.8x Televue 1.25"
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    . 10x50 Tasco binoculars, 15x70 Celestron binoculars. Saxon 909 f10 refractor AZ3

  8. #17
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    Default Re: Second hand saxon 90mm replacement diagonal

    Quote Originally Posted by SkyRover View Post
    Your link dead-ended. Here it is...

    Fast achro...mirror diagonal vs prism??

    Although, it is important to note that at f/10, an achromat is considered to be rather slow, than fast.
    Any achromatic telescope should be checked before spending the money for a prism and yes I understand a f/10 refractor is slow. Just not as slow as my f/15 refactor
    SkyRover and Fleegal like this.
    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
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    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)
    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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