[blueskies123_89 (George)]

Originally Posted by AlexN

Very nice mate!

I will say this, on M42, I find OIII gives better results than Ha anyway... Adding OIII as both a Luminance and blending it with your blue channel gives good results too.. Its always worth experimenting with these data sets.. But definitely give OIII R G OIII+B as L R G B a go...

You've shown great dedication capturing 10 hours of OIII data, and the data so far looks great.. Perhaps a tad noisy given 10 hours of exposure, how did you go about creating the monochrome image? did you just desaturate the image from the DSLR, or did you remove the green and blue channels and use them as a separate image? The red channel will likely be nothing but noise, it would be worth making sure you remove it from the equation...

Great work so far George! I can not wait to see final!!

I agree, it does seen quite noisy, I did do a unsharp mask but the original stack was still too much noise for a 10hr. Here is how I stacked it, see if you can find the problem:

-stacked in batches of ~2hr as that's how long each session was, such that each sub can be matched to the correct flat for that session
-stacked with kappa-sigma clipping in DSS, at 2x drizzle.
-Used the same 16 darks for each batch of 2hr
-Stacked the 5 resulting "autosave.tif" with the Average method and no drizzle.

I wonder if I should stack them all at once.. but then the flats wouldn't match; or that I used to few darks, but 16 darks for a batch of ~12-15 subs seems right.

EDIT: I did delete the red channel. It recorded a nice trapezium though...

Originally Posted by dugnsuz

Ooohh very nice George.
I like where this is heading!
Huge amount of data too
Doug

Originally Posted by multiweb

Sharp as a tak! Can't wait to see the final combined.

Thanks guys! I cant wait to do the colour -> looks outside -> rain

George