Deep Ha ngc 3576 and surrounds, under a full moon.

tornado33 · #1 13-06-2006, 12:42 AM

Howdy all
With the moon full I thought Id break out my Ha filter again, with Bert's 300mm lens.
5x5 mins 300mm f2.8, 7 Nm Baader H alpha and Idas uv/ir filters, processed in Iris and Photoshop.
Gee the Ha filter cuts through moonlit skies like a hot knife through butter

it loves anything emitting hydrogen alpha light.
modded 350D used.
Scott

strongmanmike (Michael) · #2 13-06-2006, 01:33 AM

Ah!... the H-alpha filter - the ansewr to every hopelessly addictad imagers needs!

Nice work but from experience it will still be better with less or no moon...although, I use a 13nm filter, a 7nm may be better...?

Mike

h0ughy (David) · #3 13-06-2006, 12:25 PM

YAWN, oh what an ordinary effort Scott

. my goodnes me, I like the ordinary

simply amazing mate

tornado33 · #4 13-06-2006, 12:47 PM

I should give it a go again without the moon up

Scott

PhotonCollector (Paul) · #5 13-06-2006, 01:07 PM

Hi Scott,

that is quite a good image. I was suprised to see RCW57 (top left) in the field ! In fact their is nebula across the entire field. Also the stellar bubble is very well defined. Is it a wolf-rayet star doing that ?

Paul

seeker372011 (Narayan) · #6 13-06-2006, 01:11 PM

wonderful image Scott.

tornado33 · #7 13-06-2006, 02:54 PM

Thanks.
Yes I imagine theres some very hot stars pouring out a scorching stellar wind, both forming and illuminating the bubbles of nebulosity. Gee what would a wolf rayet star look like close up (heavily filtered of course)?.
Scott

avandonk · #8 13-06-2006, 03:18 PM

Where do I get a Ha filter? All jokes aside, very nice clear image. I would be interested in the difference with no Moon as well. I suspect it would not be far different. If spectral width is a rough indication of lunar light pollution with 7nm/300nm = 2% of full spectrum lunar light pollution.Where 300nm is roughly full spectrum of lunar reflected light.
The Ha filter would be better than 90% transmission for Ha.
What does the image look like if you leave at as red Scott?
Bert

tornado33 · #9 13-06-2006, 10:24 PM

My Ha filter is a Baader one, 7 Nm. Alpine Astro sell them in the States
http://www.alpineastro.com/filters/filters.htm#H-Alpha has a transmission chart too.
I think theres also some dealers in Australia that sell Baader stuff too. Custom Scientific in the States make them as well.
Heres a similarily processed image but without removing the other 2 channels and leaving it red.
Scott