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Thread: Sun Ha Feb 7th 2018 Prom on East limb

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    Default Sun Ha Feb 7th 2018 Prom on East limb



    I was driving the mount over to AR 2699 this morning when I came across this little guy.

    Thanks for the peek.

    Clear Skies
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    Default Re: Sun Ha Feb 7th 2018 Prom on East limb

    Thanks John.
    I wanted to tell you that your comment in the other post on the WO refractor relative to how you use the three different focal lengths Scopes in solar Imaging was very enlightening to me. Even though we have talked about this I don't think I ever caught that detail before. Thank you for that. Which scope combination did you use for this image?
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    Default Re: Sun Ha Feb 7th 2018 Prom on East limb

    Another wonderful capture there John, maybe your winter is brightening! johnnyb
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    Default Re: Sun Ha Feb 7th 2018 Prom on East limb

    Quote Originally Posted by Eagleheaf View Post
    Thanks John.
    I wanted to tell you that your comment in the other post on the WO refractor relative to how you use the three different focal lengths Scopes in solar Imaging was very enlightening to me. Even though we have talked about this I don't think I ever caught that detail before. Thank you for that. Which scope combination did you use for this image?
    Brent, the answer to your question is that I used a SkyWatcher Pro 100ED APO (f/9) with the Quark. That gave me a focal ratio of f/38.7 which is really too much.

    I had to pull out every trick I know in decent seeing conditions just to get the above image in-focus. There are other issues when shooting at that long focal ratio that need to be considered too. As I told you once, gain is your enemy when capturing proms. One has to shoot with as little gain as possible to overcome the noise induced. That leaves one thing... exposure. If one blows the exposure too high to eliminate the necessity of gain, a prom can really suffer, as indicative of the image above.

    If you take an image into photoshop with either a blown out prom (exposure) or a lot of noise (gain), you'll have to make some compromises in the quality of the image just to make it half-way presentable. The image above is maybe six-out-of-ten when it comes to quality.

    That's one reason you'll see images with the surface blackened out. The "Committee" loves 'em, but solar imagers know it was just a dodge. (Boy, I'm going to get in trouble for that one.)

    I've battled the f/38.7 combo much of the winter to see how far I can push it. As I told Keith the other day, I don't recommend a beginning Quark imager using anything over about f/7.5, and even that is on the top end of sanity.

    I just noticed that one of the founders of the Solar Group, MG877 (Bill), has dropped in and posted his thoughts on focal ratios with the Quark. Bill is likely the best solar imager on the forum, and I'm anxious to read his thread and perhaps comment with my experiences.

    Clear Skies
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    Default Re: Sun Ha Feb 7th 2018 Prom on East limb

    Thanks John. :-)
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    Default Re: Sun Ha Feb 7th 2018 Prom on East limb

    I'm innocent! I swear.
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    Default Re: Sun Ha Feb 7th 2018 Prom on East limb

    Well, no dodging in this one! May be only a 6 out of 10, but it's a very good 6 out of 10.

    Clears,
    Joe
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