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Thread: Help w/ solar scopes

  1. #1
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    Default Help w/ solar scopes



    Hello, been loving all the solar images and videos and I am super jealous over your pst's and larger coranado scopes!

    I cant a Ford a 120mm coranado- but can I achieve same thing with a refractor and quark h alpha and say a 120mm refractor? If it was just for solar viewing what would be benefit of doublet or triplet. Would I be able to go with an achromatic refracyor and just get largest one I can and throw a quark h slpha on it? How can you mimic the coranado results with non solar scopes.

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    Default Re: Help w/ solar scopes

    Quote Originally Posted by Sierranevadamike View Post
    Hello, been loving all the solar images and videos and I am super jealous over your pst's and larger coranado scopes!

    I cant a Ford a 120mm coranado- but can I achieve same thing with a refractor and quark h alpha and say a 120mm refractor? If it was just for solar viewing what would be benefit of doublet or triplet. Would I be able to go with an achromatic refracyor and just get largest one I can and throw a quark h slpha on it? How can you mimic the coranado results with non solar scopes.
    Hi Mike,

    That's essentially what I did. I had a good 90mm refractor, and back this spring I purchased the Daystar Quark Chromosphere filter.

    FYI, Daystar just announced a 60mm scope with a *very* low price. Check out their web site.

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    Lowjiber's Avatar
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    Cool Re: Help w/ solar scopes

    Quote Originally Posted by Sierranevadamike View Post
    Hello, been loving all the solar images and videos and I am super jealous over your pst's and larger coranado scopes!

    I cant a Ford a 120mm coranado- but can I achieve same thing with a refractor and quark h alpha and say a 120mm refractor? If it was just for solar viewing what would be benefit of doublet or triplet. Would I be able to go with an achromatic refracyor and just get largest one I can and throw a quark h slpha on it? How can you mimic the coranado results with non solar scopes.
    I'm going to reply, respectfully, by disassembling your question.

    First off... Unlike DSO imaging, light is not an issue when imaging the sun. A 120mm "anything" is not needed, so save yourself some time and money by backing off that aperture.

    If you use a Quark in concert with any refractor whose aperture is larger than 80mm, you'll have to install a UV/IR-cut filter as the first thing the light "sees" upon entering the scope. I put mine in front of the diagonal. Additionally, very large apertures need an Energy Rejection Filter (ERF) installed in front of the objective lens to further reduce the amount of heat entering the scope. (More on this below.)

    You ask, "How can you mimic the Coranado results with non solar scopes." (Sic) I'm assuming you are not talking about a PST, but rather the SolarMax series. My question would be, "Why?" The SolarMax scopes are not the "favorite" of solar imagers for several reasons that, because of the forum rules, I won't mention here. The real answer is... You can (by far) surpass the Coranado SolarMax scopes with any decent refractor equipped with a Quark.

    To further respond to your post... Yes, you can "achieve the same thing" with a Quark on even a simple achromat... I have an old ST-80 (f/5) that produces great images with a Quark on the back end.

    Now, down to business...

    I use three Doublet (APO) scopes regularly with a Quark-Chromosphere.

    • Williams Optics Z-61 f/5.9
    • Skywatcher Pro 80ED f/7.5
    • Skywatcher Pro 100ED f/9

    The varying focal ratios give me varying fields-of-view, but the difference in brightness is negligible between the 61 and 100mm.

    Here are the three scopes listed above performing with a Quark-C...

    Z-61


    SW 80ED


    SW 100ED


    Stop and visit the solar-heads at the forum's Solar Imaging & Viewing Group
    Solar Viewing & Imaging - Astronomy Forums | Telescope Forums & Reviews | Astronomy Community

    We're a pretty friendly lot, and newcomers are always welcome.

    Hope that helps.

    Clear Skies
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    Default Re: Help w/ solar scopes

    In theory, a doublet or triplet ED/APO should not make any difference as light of a specific wavelength (such as hydrogen alpha) does not suffer from chromatic aberration.

    In practice, I expect the EDs and APOs are built to a higher standard than most achromats.

    I've never used a Quark, I've always been limited to a PST.
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    Default Re: Help w/ solar scopes

    You are correct, of course. As I pointed out in the above post, the three scopes that I use regularly happen to be ED scopes. However, my early reference to the many shots I've taken with a plain, old, cheap ST-80 were quite satisfactory.

    Clear Skies
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    Default Re: Help w/ solar scopes

    My favorite solar set up is with the Quark and a Celestron XLT 102 f/6.5 that is a really cheap achromat but it seems to be a sweet spot for me. I also use my ST80, SW80ST SW 100 f/9 and even my Celestron XLT120 f/8.3. I also have a Lunt LS50 DS and a LS80 which I lusted after but find I use the Quark more.

    the ST80 or SW80 are good for half disk shots and the XLT102 1/4 disk with the Quark for full disk I use the LS50 or LS80
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    Scopes: Celestron: EDGE 8" HD, 1998 Nexstar 5, XLT120, XLT102AZ, SW: ED100 APO, 102 Mak, SV: SV80ST APO, Orion: ST80, 120ST, 127 Mak,
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