Nebula in Carina

[tanguan2001]

All,

Another image of a nebula in Carina - NGC3576, with the Artemis 285 camera and H-alpha filter - from my backyard in Perth. A fascinating part of the sky.

NGC 3576

TG

[Airconvent]

wow...excellent images as always.
if you have a WO refractor, I recommend you use it too.
Seems there is a promotion for the next few months. If you have your photo published in S&T using a WO refractor, they will give you one (of their choice) absolutely free! I'd loved to see your images in there....

[tanguan2001]

Hmm- don't have a WO, and really, I have no complaints about the Orion!

TG

[JY]

Hi TG,

Beautiful image you have here !
Nice details and round stars

Cheers

JY

[tanguan2001]

Just received a new set of RGB filters from Astronomik and this is first light - an H-alpha RGB composite here.


TG

[rcj]

very nice TG! Argh, my ccd has been plagued with frosting problems. waiting for new dessicant plug to arrive and have yet to take a single HaRGB composite or equivalent yet. <envy> BTW, notice there are weak blue halos for the brighter stars in the image. is this the consequence of the HaRGB combine due to varying star sizes? Or effect from slight focus change due to the blue channel? Interesting composite nevertheless!

[rcj]

Would normally encounter this with one of my telephoto lens as well, giving a high frequency of blue halos in most if not all of its images. I have been using the method described below to lessen or rid off the blue halo effect. You can perform this in PS.

1) From the Select/Colour Range menu, select the center of a bright saturated star and adjust its fuzziness factor so that most of the blue-halo stars appear in the preview.
2) Expand the selection by 2 pixels (experiment with the pixel number here) via the Select/Modify/Expand menu.
3) Apply the Minimum filter in PS under the Filter/Other/Minimum menu. Choose 1 pixel radius.
4) Now, if the resulting stars appear very small or not bright enough, you got to apply the Fade/Darken filter to lessen the effect of the Minimum filter. Lower the opacity to increase star brightness and size.

Hope this helps.

[Tachyon]

Beautiful! Can't wait for Eta Carina to rise!

[kochu]

Eta Carena is very much visible from 10 pm onwards in February. But this year the light pollution and high clouds in Singapore has sofar frustated my efforts to get a decent image.

Kochu/23-2-06
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[Tachyon]

Eta Carena is very much visible from 10 pm onwards in February.

I'm referring to New Mexico, where it is still too low to allow imaging.