Veil - First in a long time

[JonH]

So, think this needs more work but i'm out of practice, I think there is more data to be pulled out yet and some of the colours are a bit off. But it's a a start and my first in way too long so might take me a few tries 

Taken from Mark's the other week



Big one here: http://farm8.staticflickr.com/7323/9791370334_5d861f1e26_o.jpg


Jon

[MarkS]

That's a great result Jon.  You must be well pleased with that great looking Veil.

There's lots of stars there!

What scope, flatterner, filters and camera did you use?  Exposure times?

Mark

[JonH]

Thanks Mark, although I'm pretty sure there is too much green/cyan where it should be more blue. Thought it wasn't too bad last night but with fresh eyes this morning I can see it's not as close as I first thought!

Thanks for pointing me in the right way with the setfindstar command, you can see now why Iris was having issues with it.... 


40 x 300 sec @ 800iso
SW Equinox 80
Televue field flattened
Modified Canon 450D
CLS Filter
NEQ6
QHY5 on SW Startravel 80
Captured with APT
Stacked and processed in Iris and PS CS5

[MarkS]

The CLS filter always gives a colour cast to stars.

The oiii wavelength falls in the blue/green overlap of the Canon RGB matrix.  My old 300D used to present it as blue but the 350D and subsequent Canons present it as greeny blue.  I think the passbands were altered between the 2 models.

You can achieve a good compromise by boosting the B-channel.