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  1. #11
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    Carole,

    In regards to being out of focus, it may very well be, but if I look at the original light frames they seem quite a bit sharper than the finished stack, could that be what you are seeing too?

    Allan

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    This is what I got with a single image Allan.
    It was very noisy in comparison to the stacked image of 13 lights subs. I actually only did 1 iteration of levels on this and 1 of curves, there was no point in trying to stretch it any further. I would expect a single image to appear like this and not like the single image your processed. Are you sure it was only a single image?



    Going out now, so no more replies likely for the next few hours.

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  4. #13
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    In regards to being out of focus, it may very well be, but if I look at the original light frames they seem quite a bit sharper than the finished stack, could that be what you are seeing too?
    sorry missed this as it was on page 2.

    I am not quite sure I understand what you are asking me.

    I honestly feel from what I have found is that the 13 frames stacked together are a vast improvement on the single sub and this is how it should be. More subs less noise.
    Zooming in and crops will always enlarge any focus issues.

    Carole

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  5. #14
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    Hi Allan,

    I'd gladly try PixInsights integration tool to see what it will produce. Would you mind sharing the uncalibrated image files and possibly the calibration frames as well?
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    Carole,

    I am sure it was a single image...here are some enlarged crops so we can more clearly see what I am talking about.

    Here is the original stacked version from Maxim DL (I like it's output better than what I got from DSS so I will use it for comparison):



    Note that it comes close to the stack you made with DSS. Next, here is the edited version of that file:



    Next, here is the single light image I used for editing, note the file name is 102811-011 which should match with one of the lights you downloaded from dropbox so you can pull it up and check to make sure this looks just like the light frame you have:



    Now I took that file and ran it through Lightroom, Photoshop and Topaz DeNoise (same as I did for the stacked version):



    I must confess that I did do one extra step with the single image that I did not do with the stack, and that was to try and remove the blue halos around a few stars.

    Looking at these enlargements I can honestly say I like the stars in the single image better, the ones in the stack are more bloated and more yellow. I also think the detail in the nebula is slightly, very slightly, better.

    In addition, the stars look sharper which is what I was refering to with the out of focus problem. Since the single image seems sharper, it seems that stacking them is either making the in-focus image appear out of focus, or making the slightly out of focus image look more out of focus than it really is.

    Now noise is handled through my noise reduction software so the fact that stacking reduces that really does not matter to me.

    What I thought I understood is more frames meant more exposure time, and more detail captured. I am not seeing any more detail, in fact, what I am seeing I like less than what is on the single frame.

    That is where I must be missing something. I can not understand how a single image can look even remotely close to 30 lights, 15 darks, 15 bias and 15 flats stacked. From what I keep reading, it should not even be in the same ballpark.

    Allan

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  8. #16
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    Quote Originally Posted by toolmaker View Post
    Hi Allan,

    I'd gladly try PixInsights integration tool to see what it will produce. Would you mind sharing the uncalibrated image files and possibly the calibration frames as well?
    Dave,

    If you send me your email in PM I will invite you to my dropbox folders which have all the lights, darks, flats and bias files in TIF format.

    Thanks!

    Allan

  9. #17
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    I have a question for ya. Do you by chance have the hot and cold pixel fix checked? If you do, they amount to little more than a blur tool to remove them. This will make your stars less pinpoint and have a fuzzy appearance. If you have them checked, uncheck them and stack them again to see what you get.

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  10. #18
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    Quote Originally Posted by jimt View Post
    I have a question for ya. Do you by chance have the hot and cold pixel fix checked? If you do, they amount to little more than a blur tool to remove them. This will make your stars less pinpoint and have a fuzzy appearance. If you have them checked, uncheck them and stack them again to see what you get.

    Jim
    Had to look for that one Nope, both unchecked. Thanks for the suggestion though!

    Allan

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    Carole,

    Also, about the focus, I start by using live view on a bright star and zoom all the way in, then make the star as small as I can with the telescope focus. Once I am happy with that, I lock the focus and shoot through a mask to make sure I am dead on. Here is the result of the mask shot from the night I shot the NGC6992 images (massively cropped from an original 4928x3264 image):



    Does this look correctly in focus? Did I miss something? Is there a better way?

    Thanks!

    Allan

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    It's very close Allan - the ray that runs from 11 o'clock to 5 o'clock and splits the two 'V's is just a touch off to the left side when it should ldeally be centered. It looks like the basic technique is solid, just needs a bit more finesse on the final adjustments.

    BTW even with all of the problems I really liked you're image(s) of the Veil. Hopefully you'll get everything worked out soon on the processing end.
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