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12-1-2021 Solar H Alpha Day (Eastvale, CA)

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#1 astroflak88

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Posted 02 December 2021 - 12:43 AM

get.jpg?insecure

get.jpg?insecure

 

I seem to notice an uneven coating. I tried to do the the calibration frames in other times (which by the way I didn't apply here) but it seems all it does is invert and doesn't really solve the problem. Any tips on how I can even out the frame thru software is much appreciated.


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#2 SgrB2

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Posted 02 December 2021 - 10:45 AM

It would be helpful if listed all the components in your image train.

Flats are usually effective when you take them right after your

solar images and make sure the power in the histogram is

nearly the same as your solar images.  Sometimes a changing

cloud cover can cause similar problems if you wait too long to

do the flats.

 

Cheers,

SgrB2



#3 astroflak88

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Posted 02 December 2021 - 12:41 PM

Here is the imaging train and it was a clear sky when I took this:

St80, uv/ir reject filter, 2" ext tube, quark gemini in chromosphere mode, asi174mm.

#4 SgrB2

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Posted 02 December 2021 - 05:25 PM

Here is the imaging train and it was a clear sky when I took this:

St80, uv/ir reject filter, 2" ext tube, quark gemini in chromosphere mode, asi174mm.

One thing is that you are not using a tilter or a 2" GSO Focal Reducer

either of which would reduce Newton's Rings altho (if rings there be)

they are huge in your setup.  The sky may look clear but the atmosphere

can be tricky with winds high above that plague your field of view.

 

Cheers,

SgrB2



#5 astroflak88

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Posted 07 December 2021 - 12:18 PM

I was under the impression that the tilter only gets rid of the newton rings. I wasnt aware that it could also fix what seems to be uneven coatings.


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