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Thread: Meade Adventure 80mm F/5 Optics Question

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    Default Meade Adventure 80mm F/5 Optics Question



    I purchased this scope as a wide angle finder. I am fine with 12.5 magnification. However, at 66 magnification stars have a flare/tail to them. Is this normal for a f/5 refractor scope? I know with fast scopes a better/more elements eyepiece should be used. Just want to make sure my optics are ok.

    https://www.amazon.com/Meade-Instrum.../dp/B06XR5L9TK

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    Default Re: Meade Adventure 80mm F/5 Optics Question

    The focuser draw tube may need adjustment or the entire focuser may be slightly out of alignment.
    The shorter the f/r the easier for misalignment.
    Also check the diagonal is not causing the issue.
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    Default Re: Meade Adventure 80mm F/5 Optics Question

    I changed to another diagonal and 6mm eyepiece, same problem. The focuser was lose. So I tightened it a little, which improved the star image. However, at 66 magnification the star did not look as tight/pinpoint as it should be. Every star is different. I will try a few other stars tomorrow night. I think it might be the focuser.

    Thanks Gabby76

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    Default Re: Meade Adventure 80mm F/5 Optics Question

    Gabby76:

    Images really improved with the included aperture mask. My thinking is with a f/5 scope, higher quality eyepieces are needed. What does your experience tell you about this?

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    Default Re: Meade Adventure 80mm F/5 Optics Question

    That it works very well as a 50mm f/8?
    The Sidgwick Standard of the focal length being at least 3x longer than the telescope aperture in inches should give views with minimal CA, the Conrady Standard of 5x aperture in inches to focal ratio is clearer still.
    There is a calculation to establish the basic chromatic blur you will see in a refractor depending on lens material.

    What is the measurement of the aperture stop on the 80mm?

    Good quality eyepieces will always improve the views as well as a good quality diagonal.
    The trying to stay on a budget the GSO Plossl is the minimum I recommend as the quality vs price is quite surprising. If wanting to go to a higher grade the Vixen or TeleVue Plossls are hard to beat.

    I have been informed that the aperture stop is 40mm on that telescope so it is operating as a f/10 telescope.
    Last edited by Gabby76; 03-24-2019 at 03:31 AM. Reason: added information
    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: Meade Adventure 80mm F/5 Optics Question

    You likely can significantly improve your performance with the simple DIY modifications. You can ensure the focuser is aligned with the objective with the collimating EP. https://agenaastro.com/agena-1-25-co...efractors.html

    You can make sure the drawtube is snug, has no play, and travels smoothly with some Teflon tape. https://www.ebay.com/itm/1Pc-10mm-Wi...UAAOSwT~9WkSqV

    Flock the tube. ScopeStuff

    Blacken the edges of the objective lenses with a black sharpie. Make sure to re-install the lenses in the same order. Handle them gently with a soft lens cloth.

    While the focuser is off the tube, clean off the stock grease (GOO!) smooth the gear teeth with a hand file, re-grease LIGHTLY with white lithium, and re-install using the collimating EP as you tighten the screws holding the focuser in place.

    I would say most of the effects you are seeing is coming from the focuser not being square to the objective.

    I was very pleased with the Celestron X-Cel LXs in the ST80. The GSO plossls were good too, but there was a noticeable improvement with the X-Cels.

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    Default Re: Meade Adventure 80mm F/5 Optics Question

    Quote Originally Posted by Gabby76 View Post
    Good quality eyepieces will always improve the views as well as a good quality diagonal.
    The trying to stay on a budget the GSO Plossl is the minimum I recommend as the quality vs price is quite surprising. If wanting to go to a higher grade the Vixen or TeleVue Plossls are hard to beat.
    I like my GSO Plössls with my ST80.
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    Default Re: Meade Adventure 80mm F/5 Optics Question

    Quote Originally Posted by Gabby76 View Post
    Good quality eyepieces will always improve the views as well as a good quality diagonal.
    .
    Absolutely! I use only my good EP's on this scope. Although my three Expanse EP's were ok, they reside in a "sock drawer" someplace

    Abb
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    Default Re: Meade Adventure 80mm F/5 Optics Question

    Great, and thanks for all the help.

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    Default Re: Meade Adventure 80mm F/5 Optics Question

    I picked recently Meade Adventure 80mm for solar scope. It performs quite nicely. Even the stock 1.25" focuser is not bad, once you tidy it up.

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