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Thread: AstroTortilla....need help

  1. #11
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    Default Re: AstroTortilla....need help



    I changed the sigma, minimum and maximum settings and had 2 good solves! Except they take almost 3 minutes to solve

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    Default Re: AstroTortilla....need help

    You can shorten the time up once you have had a successful solve by changing the 180 value to something smaller... like 45 or so. Basically 180 is telling it to search a huge portion of the sky to match it up. Once you've gotten "close" this is not necessary anymore. I think telling it to go to an image automatically uses 180, whereas if you use the main interface, you can alter this value at will.
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  4. #13
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    Default Re: AstroTortilla....need help

    Quote Originally Posted by AstroChuck View Post
    I changed the sigma, minimum and maximum settings and had 2 good solves! Except they take almost 3 minutes to solve
    Things that can dramatically affect the solve speed:

    1) move all indexes out of the folder except the one(s) you actually need
    2) Set the scale minimum and maximum parameters to match your FOV
    3) use jpeg files that do not have too many stars (usually a 5-6 second exposure at ISO 1600 will suffice) - the sigma setting can compensate to an extent for this...

    I can maybe help some more if you can post details/screenshots of what the logfile (in debug mode) says after a solve - see my screenshots for examples.

    In particular, pay attention to the "simplexy" score - this needs to be between roughly 20 and 200. If it is too low it won't solve and if it is too high it will take longer to solve...
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    Default Re: AstroTortilla....need help

    Quote Originally Posted by jmelz28 View Post
    You can shorten the time up once you have had a successful solve by changing the 180 value to something smaller... like 45 or so. Basically 180 is telling it to search a huge portion of the sky to match it up. Once you've gotten "close" this is not necessary anymore. I think telling it to go to an image automatically uses 180, whereas if you use the main interface, you can alter this value at will.
    I'm sure you are right but personally I always leave it at 180... I can still solve in <10 seconds (usually).

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    Default Re: AstroTortilla....need help

    For me, changing the scale to numbers close to what my camera and scope actually capture had the greatest improvement in resolution speed. Every setup will be different, but just as an example, I use a Canon T2i, with 1000mm, f4.9 Orion newtonian. This gives me a FOV of approximately 76 arcminutes wide by 56 arcminutes high. The diagonal dimension is about 94 arc minutes, so I set my minimum scale to 1 (degree) and the maximum to 2 (degrees). This is a prime focus and would, of course, be different if I used a barlow.

    Others have posted the formula for calculating the FOV for a particular camera/scope combination, or if you can get AT to resolve an image in the field, even if it takes along time, it will tell you what the FOV is, and you can adjust from there.

    One other thing, like some posters here, I had problems getting AT to work on saved or downloaded images. Probably something to do with AT adjustments, but I found that sometimes AT would resolve the example images that it includes, and sometimes it would not. My first real success with AT came when I took it to the field and had it resolve images captured with my scope and camera. So if AT seems quirky indoors, take it to the field and see if it works better. It did for me.

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    Default Re: AstroTortilla....need help

    Quote Originally Posted by AstroChuck View Post
    I actually solved several of my images using Astrometry.net on Flickr and it comes up with roughly the same FOV. I think I got the cart before the horse. It's worked to capture and image live, but no solve. I didn't have any indexes then. I'm downloading now, it's taken up to 50 seconds and still no solve. I've only downloaded 4011-4007 though. I hope this is right. I'll keep you posted
    Chuck,
    My resolution times are routinely in the range of 1 to 2 minutes, sometimes 3 minutes, sometimes less. When I was first learning AT, I had a couple of instances were it took 5 minutes or longer to resolve, but it eventually resolved. If it doesn't resolve in 50 or 60 seconds, give it some more time. If you can get it to resolve even in 180 seconds or longer, at least it gives you a starting point for fine tuning and speeding things up.

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    Default Re: AstroTortilla....need help

    Are you guys running slow PC's? ...
    Also, please note that even if you do set the min/max parameters correctly for your FOV you still have to move unused indexes out of the folder for best performance - because of the way that AT iterates through them.

    You really should be able to solve pretty much any image in rather less than 60 seconds. If it's taking longer than that, I'm certain you can do more tweaking!

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    Default Re: AstroTortilla....need help

    Quote Originally Posted by Phil Leigh View Post
    Are you guys running slow PC's? ...
    Also, please note that even if you do set the min/max parameters correctly for your FOV you still have to move unused indexes out of the folder for best performance - because of the way that AT iterates through them.

    You really should be able to solve pretty much any image in rather less than 60 seconds. If it's taking longer than that, I'm certain you can do more tweaking!

    I have wondered if the time to solve issue relates to the PC being used more than anything else once the AT parameters are adjusted to Phil's recommended settings. A couple settings/things I do different than Phil, I have indexes 205 thru 219 in the Astrometry data folder, search radius set to 45, Scale min = .8, scale max = 2, and most of my solves are in the 5 to 12 seconds time range, typically 6 ro 7 seconds to 1 arcminute accuracy.

    A first solve after a cold start after being shut down for a week or so and the computer being cold started may take as much as 45 seconds however the next solve will be about 6 seconds... This is by using "Snap" image files from BYEOS...

    The computer is a Intel i7 3.4Ghz CPU with 8Gig of RAM and Windows 7 Pro 64 bit operating system...

    It would be interesting to see what other folks are using for computers and corresponding resolve times are...
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    Default Re: AstroTortilla....need help

    Mitch,
    I could use some help using BYEOS with AT. I've tried capturing using the "preview" button on BYEOS, which saves the file in jpeg format. Each time I've tried to get AT to resolve such an image it fails. There's a lot at the bottom of the AT window that flashes by so fast I can't read it, but is seems like AT is having problems reading the jpeg file. The only way I've been able to get AT to resolve is through RAW files. Any thoughts on what I might be doing wrong?

    By the way, my laptop is an i5, 2.5ghz, 4 mb, running Windows Premium 64 bit, and have indexes 205 through 211, and it still takes 1 to 2 minutes to solve. Does the difference in processor speed account for the added resolution time, or is there something I'm missing?

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    Default Re: AstroTortilla....need help

    Quote Originally Posted by Phil Leigh View Post
    Hi - I downloaded both of your images and fed them into AT - they solved without a problem using index 200-09.fits - please see attached output screenshots...

    Note: I am still using the old indexes - also note the scale minimum =1 and scale maximum = 3 parameters and search radius=180. Also I am using a sigma value of 50 (which I nearly always use).

    I didn't alter your jpgs in any way.

    PS the first file took 49 seconds to solve because this was the first time I had run AT since the last reboot of my PC - a second solve of the same file took 9.1 seconds because the index data is now cached in my PC RAM.

    regards
    Phil
    Thanks Phil. After making the adjustments you said above, AT solves all my images in 12 sec or less. Now to get a clear night and and take it for a test drive! Again, thanks a lot Phil.
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