Swan and Eagle in their natural habitat

[avandonk]

Clouds as usual stopped play. I processed what I had.

Canon 5DH. Canon 300mm F2.8L at f/5. All at 400 ISO fridge at -10.0 C.

10x( 4 & 8 min) and 2x16m exposures. Usual HDR method.

Large image here 11MB
http://d1355990.i49.quadrahosting.co...swan&eagle.jpg


Bert

[multiweb (Marc)]

That is really very nice Bert. Well framed and the details are still in there, even close up. Top work

[renormalised (Carl)]

After reading the caption for this thread I was waiting for David Attenborough to start commenting

Nice pic

[AlexN]

Well, despite clouds cutting the imaging short, this image is definitely up to your usual high standards Bert..

Well done.

[Octane (Humayun)]

Bert,

Pinpoint stars and great nebulosity detail.

However, there is a severe glow to the top left, and purple/green noise scattered throughout the image, especially at the lower edge and right edge frames. What is it? Is it a bi-product of HDR (LDR)?

Regards,
Humayun

[dpastern (Dave Pastern)]

Good shot Bert, Humayan has good eyes, he's right. Still, I'd be stoked with a shot like that, good stuff!

Dave

[tornado33]

A huge field there, lots of detail Like a schmidt telescope plate. Im thinking the glow might be gradient, as with such a wide area gradient is almost unavoidable.
Scott

[Jen]

nice work Bert

[avandonk]

Originally Posted by Octane

Bert,

Pinpoint stars and great nebulosity detail.

However, there is a severe glow to the top left, and purple/green noise scattered throughout the image, especially at the lower edge and right edge frames. What is it? Is it a bi-product of HDR (LDR)?

Regards,
Humayun

It is a combination of factors Humayun. With a full frame sensor at this focal length (290mm)there is vignetting. The vignetting can introduce gradients and increase apparent noise especially in the corners. As I had only two 16m exposures noise could not be minimised by median stacking. The HDR process is very good at showing the dim nebulosity at the same time as the very bright stars without saturating them. It also is very good at faithfully showing any noise that is present.

I did not use any noise suppression or GradientXterminator. More data is needed at the 16m exposure level. With luck the weather will allow me to get this data.

Here is a maximum quality jpg cropped to what a C sensor sized camera would give. 7MB
http://d1355990.i49.quadrahosting.co...08/swanegC.jpg

I have found nearly every optic I have both lenses and telescopes which perform very well with the Canon 20D are found wanting with the full frame of the Canon 5DH.

This proves again the first rule of the Universe. 'There is no free lunch.'

Bert

[avandonk]

The major trouble with widefields is colour gradients, Here is a crop from the RHS adjusted in PS to eliminate the purple cast due to the gradient.

Bert