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Thread: Deep Sky Stacker and calibration frames

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    Default Deep Sky Stacker and calibration frames



    I've been using dark frames only until now. In DSS, after registering, I select all darks and the lights for one specific filter then stack.
    I'm trying to incorporate flats and bias frames now.
    I bring everything into DSS (lights,darks,bias, flats). I register all frames together.

    Does the stacking process include selecting all darks, all bias, flats for a specific filter, lights for the same filter?

    The research I've done talks about adding, subtracting and dividing calibration frames. Does DSS know what to do or do I have to use intermediate steps?

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    Default Re: Deep Sky Stacker and calibration frames

    DSS uses all calibration frames that are on the Main group on all lights. With the other groups it uses any calibration frames only on the lights in that group.

    If you include all the calibration frames per filter, DSS knows what to do with them. But you do need to stack only one group at a time. DSS does not know which filter a frame belongs to.

    What I do is to place the master dark on the main group. Since all my exposure times are the same that is valid. YMMV. You could do the same with master bias. And if you don't yet have a master dark and master bias, load up all the darks and bias into the main group. When done you will have a master dark and master bias for next time.

    Then I place the lights, flats and dark flats for each filter on subsequent groups. Sometimes (often actually) I cheat and use a master flat only.

    Then register everything but don't stack. Once everything is registered I choose a reference frame, check just the frames in the main group and the group for one filter and then stack that.

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    Default Re: Deep Sky Stacker and calibration frames

    I’m not clear on the meaning of “group”.

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    Default Re: Deep Sky Stacker and calibration frames

    Ken, this is just what I was looking for although I'm still a bit fuzzy. Until now I haven't had to deal with "File Groups" so I need to study these.
    Looks like "Flats" cannot be included in the "Main Group" because a different master flat is required for each filter.
    So....first thing I do is load up everything but the flats into DSS and register. At this point the master dark and bias are created.
    Now (I'm thinking) I create new lists by filter and include in each list ... the master dark, master bias, and the individual flat frames. Register and stack each filter separately.
    You say "place the lights, flats and dark flats for each filter on subsequent groups". At what point do "Flats" become "Dark Flats".
    Thanks!

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    Default Re: Deep Sky Stacker and calibration frames

    Dark flats are more properly named flat darks but the name dark flats his more commonly used. They are darks that you apply to your flats just as you apply normal darks to lights. They can take the place of bias frames for some cameras.
    You can use them if your camera has glows even with short exposures or bias frames are unreliable. They are recommended for the ASI1600 camera.
    If all your flats use the same exposure time you can use one master dark flat. Otherwise there will be a master dark flat for reach master flat. Note that once you have created a master flat, you don't need to include the master dark flat in DSS as it has already been included. DSS looks after this by only applying the master dark flat when there is more than one flat in the list.

    If you register and stack each filter from separate lists, you'll need to remember which frame is the reference frame and include it (unchecked) with each other filter when you register and stack them.
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