NGC7000(HOO) from Pier3

Hi Shane, 

That is really an excellent image and a good choice of framing of such a vast nebula. There is a lot of detail in there and I guess adding some sulphur data probably wouldn't make a significant improvement. Really nice colour from a bi-colour image Shane. Now so looking forward to processing the data from that pier I've been receiving, but what to do first? 

Thanks for sharing, 

Cheers, 

Ray 

Hi Ray
Thanks for your kind words! 
As far as I know, there is a line of bad pixels in Oiii flat frames and Ha flat frames(Shown as the photo below), so you need to do cosmetic correction for both of the flat frames. Also, the Oiii flat frames are not so well, so you may want to take extra care of the Oiii data

Cheers! 

Hi

We usually do extra frames for customers for cases such as this, did you receive extra frames with the order?

none the less a very nice image and well processed

Can you let us know which frames had issues and we will double check your order.

Hi Shane, for us this is an ongoing thing with Flats and pier 3, its just mega fussy with narrowband flats

We now have flat panels fitted so dont have to rely on  a short dusk period so this will improve things for sure

Steve

Hi Shane, 
Thanks for the heads up. I did a quick check on a couple of light frames and unless my eyes deceive me am seeing  issues on columns 1287 and 1727 in addition to the one in the flat frame at column 1388. I just assume that these will calibrate out, if not I'll add to cosmetic correction. 
Cheeky of me to ask, but was that a straight HOO image or did you use some skulduggery in something called pixel math for the third colour contribution. Note to oneself, read up on pixel math. No need to answer my cheeky question obviously. 

Cheers, 
Ray 

Hi Ray
I used the Pixel math instead of LRGBCombination to combine my Ha and Oiii data, with the G channel taking a blend of 40% Ha and 60% Oiii data, I don't know if you call that skullduggery
R/K: Ha
G: (0.4*Ha)+(0.6*Oiii)
B: Oiii
This way you can get richer colour layering and avoid the appearance of green-ish stars caused by simply using HOO combination (although it can be removed by SCNR)

Shane 

Hi Phil

Thanks for replying to me. The last 5 subframes of Ha and last 3 subframes of Oiii were out of focus, and they have double spikes or some... onion rings... 

Shane

Hi Shane, 

That's brilliant, thank you so much. That example you gave was a major piece of the jigsaw and believe I can now start to make good use of it. Watch out for some garish images from me in the future though.

Thank you and cheers, 

Ray 

Hello Shane,Yes,  This was an older issue with the narrow band offset settings that has now been resolved. please let me know which frames you had an issue with and I will get some replacements done for you no problem.
Regards
Peter

Dude,
The last 5 subframes of Ha and last 3 subframes of Oiii were out of focus, and they have double spikes or some... onion rings...

Great image Shane, and I am pleased to see you on here! Take care mate.

Simon

Love the info re PixelMatrhs.  I have been using NRGBCombination script with mixed results.  I'll go back and try this on some of my other data...

Regards

Mark