Four High Dynamic Range Widefields

[avandonk]

I have reprocessed a couple of these

Carina 3.7MB
http://avandonkbl.bigblog.com.au/dat...0713085325.jpg

Lagoon & Trifid 2.5MB
http://members.optusnet.com.au/~trlee8/LAGTR_L.jpg

Corona Australis 2.1 MB
http://members.optusnet.com.au/~trlee8/corA_ehdr07.jpg

Omega Cent and Centaurus A 2.8 MB
http://members.optusnet.com.au/~chee.../OC&CA_HDR.jpg

I am going to remove them soon as I am running out of webspace.

Bert

[iceman (Mike)]

What's the focal length on the last one? Just wondering what I'll fit in the FOV when I start piggyback stuff.

Great shots Bert, very sharp though they still look a bit purpleish to me

[avandonk]

Sorry Mike I should have said they were all taken with the Canon 5DH and the Canon 300mm lens. The field of view in all is near 6.8x4.5 degrees.
A 200mm lens would get the equivalent FOV with a C size sensor (24x15mm).

I am starting to think that the blue cast is due to light pollution and if I eradicate it I lose any faint blue nebula. If you notice
the blue nebula on M20 it is all there. Thats why I have started dabbling with narrowband imaging. The solution to this is dark skies and unfortunately we cant all live in the outback. We are still more fortunate than our North American, European or Asian brothers as we have nowhere near their light pollution or air pollution.

Fast apertures f/2.8 will very quickly show any gradients no matter what the source. I had a set of exposures with very strange coloured gradients and I figured out it was due to fireworks from the opening of a nearby (1k away) Bunnings store!

When I do long say 15min exposures I try to do this with the target object as near to the zenith as possible.

Bert

[Dr Nick (Nick)]

Wow! They're all incredible! I will have to try a fw widefield shots one day...

[Rob_K]

Amazing shots Bert! Love the last - lots of dim galaxies in the NGC5128 group showing through, particularly dwarf elliptical NGC 5206 below & slightly right of OC. Triffid/Lagoon shows globs NGC6544 & 6553 shining strongly through the dense starfield! Awesome, would that we could see the night sky like this!!

[h0ughy (David)]

love the collection Bert! especially corona australis