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Thread: GSO 42mm Superview vs. Orion Q70 32mm

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    Default GSO 42mm Superview vs. Orion Q70 32mm



    The 42mm GSO has been tested to be 53 degree. The 32mm Orion Q70 is a 70 degree. I will be using a 120mm f/8 refractor 1000mm. Which of the two will give me a wider view? I like the superview, because it is 4 ounces less in weight.

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    Default Re: GSO 42mm Superview vs. Orion Q70 32mm

    How did you come up with 53°AFOV? It is listed as a 65°AFOV and though they are sometimes 1-2° outside spec, that is a very large difference.
    Using the numbers you posted the FOV is 2.3° for both eyepieces.

    N.A.A. Telescope Math Calculator
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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
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    Default Re: GSO 42mm Superview vs. Orion Q70 32mm

    How did you come up with 53°AFOV? It is listed as a 65°AFOV and though they are sometimes 1-2° outside spec, that is a very large difference. Using the numbers you posted the FOV is 2.3° for both eyepieces.

    A reviewer/purchaser did a test that showed 53 degrees. Another reviewer/purchaser test showed 54 degrees.

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    Default Re: GSO 42mm Superview vs. Orion Q70 32mm

    Can you post a link to those reviews?
    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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    Default Re: GSO 42mm Superview vs. Orion Q70 32mm

    Quote Originally Posted by Gabby76 View Post
    Can you post a link to those reviews?
    Size of the diagonal issue.
    Attached Images Attached Images

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    Default Re: GSO 42mm Superview vs. Orion Q70 32mm

    Well I am not sure what his issue with the diagonal was other than he may have been using a prism which typically has a smaller clear aperture compared to a mirror which has 48mm clear aperture for a 2" and 27-28mm for a 1.25"
    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
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    Default Re: GSO 42mm Superview vs. Orion Q70 32mm

    Based on what I know of the relevant equations ....

    TFOV = AFOV/Magnification
    TFOVmax = 57.3*FieldStop/FocalLength. (max tfov possible for a particular fieldstop).
    MinimumOf(TFOV,TFOVmax) is what you want.

    Scope 120mm/1000mm

    EP FS TFOV TFOVmax Min
    GSO 42/65 41.5 2.73 2.38 2.38
    Q70 32/70 40.0 2.24 2.29 2.24





    GSO does not list the FS, but it is 41.5mm (EP retaining ring) as per user reports.

    You could also input your data (including FieldStop) in the Stellarium Ocular Plugin and check what they show.
    It will give you a better feel of the difference.
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