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Thread: Startools "Repair" for Eggish Stars

  1. #1
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    Default Startools "Repair" for Eggish Stars



    Hi All,

    I will probably spend hundreds of hours trying to learn image processing (I am a slow learner). Actually, probably more than that, but at least I have some success and that motivates me.

    I came across an interesting method in Startools to help round egg shaped stars. I works pretty well and I am sure that the settings and mask can be tweaked for better results.

    I am imaging with a ED ED102 on an AVX mount. I am just getting into guiding and the AVX is challenging for me to get nice round stars. They are pretty good and much improved with guiding, but are not perfectly round under magnification scrutiny. Especially using 300 second exposures. Also, I am not using a field flattener, so even with a cropped sensor dslr, I do have considerable field curvature on the corners.

    I know that we have quite a few Startools users on this forum. Maybe some folks like me that have had some success sometimes, and not so successful other times, can use this method to help round their stars. I works pretty well. If you are interested, check out the link below.

    StarTools • View topic - Repair Module Use

    After weeks of overcast, rainy, and foggy night skies, I had to get out the laptop and play with processing. Just an hour or two of the hundreds of hours that I need to put in to improve my skills.

    Below are links to a single 300 second image at iso 200 (just testing) and converted to jpg format.

    The link below is the top right corner of the image magnified 150 percent in Startools. The original unprocessed image.

    https://drive.google.com/file/d/1hkY...ew?usp=sharing

    The link below is the original image with repaired stars following the instructions in the link above.

    https://drive.google.com/file/d/1GhB...ew?usp=sharing

    I am sure that there are many ways with many applications to help accomplish this, but for a quick fix, this method is pretty cool.

    Thanks,
    Jim
    Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
    EP: 12 and 32 mm Plossl, 5 mm Celestron X-Cell, Agena Starguider ED8mm & ED12mm, ES 32mm 2” 62 degree, 2x Barlow
    Mounts: Celestron AVX with Orion MM Autoguider, SLT; Binoculars: Bushnell 10X50;
    Camera: Nikon D3300, DigiCamControl, PHD2, SharpCap v3.2, StarTools, PE14
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  3. #2
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    Default Re: Startools "Repair" for Eggish Stars

    Anyone who has done more than cursory AP, will have spent 100's of hrs as well.
    The ones who are really good at it, just make it look easy.

    I am using an almost identical setup as yours... Get the flattener. Or get the focal reducer/field flattener, or both like I did!
    Getting the field flat, with nice stars all the way out, makes life a lot easier.
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    Jim
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    Default Re: Startools "Repair" for Eggish Stars

    I hear ya Jim!

    You see, last month, I spent $350 of the remaining $150 of my retirement scope budget on the guider. Definitely money well spent. Unguided with the AVX is most challenging. Goodies will come along, but much more slowly now.
    Yes, the FF/FR is next on my list.
    Looking at your sig, Looks like you are using the Astro-Tech on your refractor. They are very reasonable. Maybe not too distant future.

    Thanks,
    Jim
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    Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
    EP: 12 and 32 mm Plossl, 5 mm Celestron X-Cell, Agena Starguider ED8mm & ED12mm, ES 32mm 2” 62 degree, 2x Barlow
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    Default Re: Startools "Repair" for Eggish Stars

    I have used the Repair Module in the past to fix coma from my reflector. It is pretty easy to use and works quite well for that purpose. Putting a Baader MPCC into the optical train has since made this unnecessary.

    I agree with Jim, get the optics to fix the problem if you can see your way to it, and spend more time bringing out the details in the photons you have so painstakingly collected!

    Bob
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    href="http://clearoutside.com/forecast_image_small/41.70/-72.67/forecast.png" rel="lightbox[signatures]">
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    Default Re: Startools "Repair" for Eggish Stars

    The Stellarvue 0.8 Flattener/Reducer works great with the ES 102ED. I know because that is what I use!
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    Default Re: Startools "Repair" for Eggish Stars

    Jim - thank you for posting. As a new user of ST you just saved me some of those 100's of hours.

    Side note - I'll a load of questions for you - should they be posted here or in the StarTools group?

    THX SKE
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    Default Re: Startools "Repair" for Eggish Stars

    Hi SKI,

    Glad that you might use the info. I was just bored and was reading a book while playing around with Startools with my laptop. Needless to say, I got more into Startools and did get much reading done. Not sure how this technique will effect nebulosity.
    Very powerful tool that works great with a proper star mask.
    Anyway, I did think about it and take Jim’s recommendations (jimminCT) about the FF/FR and just ordered one. The ST Repair tool will still be helpful if I pull the FF for a smaller target that I plan to crop.
    As far as your posting question, not sure. I joined the ST group, but have not posted to it yet. There are many ST users here though that might be of help. I know that Hondo has a ST workflow thread that helped me a lot.

    Thanks,
    Jim
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    Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
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