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    Default M81 weird streaks



    I have gotten my tracking down where I am hardly losing frams. However I have weird streaks. Image in 40 mins at 35 seconds each at ISO 1600.
    10 Flats, 10 bias, 10 darks

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    Default Re: M81 weird streaks

    Did you use the flats twice? If not, you might try without them since they didn't work well.
    Dan Crowson - O'Fallon MO

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    Default Re: M81 weird streaks

    Man, that actually looks pretty cool and artistic!
    -Oliver

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    Default Re: M81 weird streaks

    With exposures of only 35 seconds, your noise level is going to be pretty high. Try longer exposures. You should also try using more darks. 20 is a good number.

    Your flats aren't working. Do you shoot new flats every session?

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    Default Re: M81 weird streaks

    A lot of the streaking is caused by your use of very shot light frames. If you increase the exposure time it will help a lot. In my experience the streaks are caused by stretching the image to much. If you have more data to work with you can stretch the data more without the streaking or at least less of it. Increase your Bias frames to at least 100 and use Flats. 50 or so would be a good start. Flats will go a long ways to help eliminate the vignetting you are getting in the image and the halo effect you see in it. There also appears to be either some dust bunnies or smears on your camera sensor or your optics or both. Flats will also help you get rid of them.

    Good luck,
    Richard

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