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Imaging over a multiple nights.

Posted: Sun May 12, 2019 11:10 am
by Rrowe
This weekend I am imaging the crescent nebula over Saturday and Sunday night. On Saturday when I was done i took my darks, Flats and Bias Frames. On Sunday I will do the same. My question is do you stack all the lights and calibration frames together? or seperate the stacking into each night then somehow merge the 2 master lights together?

Thanks
Randy

Re: Imaging over a multiple nights.

Posted: Mon May 13, 2019 7:17 am
by Doug
Hi Randy,

For what it's worth, I often image the way you do. . . spend a couple of nights imaging, then take one calibration set for both nights. The one exception is darks. If you have regulated cooling on your camera, then you can build a library of darks.

Here's what I typically will do, Image, Friday, and Saturday night. . . then on Saturday get up early and take my Flats and Bias on the last night.

Sure, if you're a purest, you could argue, dust could form on the objective each night, but, where do you draw the line? You could get new dust every minute.

I say do it once a weekend and you're good to go!

Doug

Re: Imaging over a multiple nights.

Posted: Mon May 13, 2019 1:25 pm
by Rrowe

Re: Imaging over a multiple nights.

Posted: Mon May 13, 2019 2:50 pm
by Doug
Hi Randy,

What were your exposure settings. . . etc?

Looks like a good image, but, it looks like there could have been some data that was clipped. Depending on your exposure settings, I think you could have pulled a little more detail out of the image.

If you want any suggestions, I'd be happy to help. But, I also know sometimes it's better to move on to the next image.

Doug

Re: Imaging over a multiple nights.

Posted: Mon May 13, 2019 3:11 pm
by Rrowe
Not a problem I am here to learn. 5 min @ ISO 800. I have 50 Lights. 30 Flats. 10 Darks. 50 Bias.

I am using an Unmodified Canon T6i. Orion ED80T CF. w/ orion FF. Skywatcher EQ6r mount. and an autoguider.

Re: Imaging over a multiple nights.

Posted: Mon May 13, 2019 3:13 pm
by Doug
What are you using to process the image? Photoshop?

I think the "black point" is too black and when you cut the black point off, you lose the fainter details.