Orion at 85mm and HDR Now improved with more data.

[avandonk]

Large image 2.5MB. The FOV is 24x16 degrees.
http://members.optusnet.com.au/~cheekyfish/OR_85mm.jpg


Details
Canon 5DH. Canon 85mm F1.8, Hutech LPS filter, all at ISO500.

At f/2.8, 5X(2min, 4min)
At f/4 , 5x( 30s, 1min, 2min)

Converted from RAW to TIFF and corrected for flats with ImagesPlus. Stacked and aligned wiith Registar. Used EasyHDR to produce a LDR image from these five images.

If you look carefully you can just see the Witches Head Neb. at top right.

Bert

[iceman]

Beautiful widefield, Bert. I'd have preferred to have Betelguese a little more in frame for better composition.

Amazing view of the Orion constellation.

Have you done any h-a work?

[leon]

I'll go along with Mike, Bert not half bad at all, Nice lens too.

Leon

[vash]

nice shot.

You can see Barnard's loop as well, I've always wanted to try and capture it. More exposure or higher ISO would be good to see it brighter would be nice

[browndog]

Well done Bert. :thumbsup:
This is a really nice wide-field image of this section of Orion. You can see nebulosity throughout this image. I didn't know that it was so extensive.
Great image.

[sheeny]

Superb, Bert! ...as we've come to expect!;):thumbsup:

Al.

[avandonk]

Thanks all. Mike I have not collected any HA yet but I think it would ruin the balance and maybe obscure the dark or dusty nebs. I wanted to keep Barnards Loop in the centre to dodge any vignetting. HDR is a whole new game and any further HA or O3 would have to be collected the same way.

I think we are all to used to images that are stretched to unrealistic intensity levels. Whilst this adds to the clarity of the image it tends to lose either the very faint or the bright intensity information and at 12 bits would not even be recorded. You either get the faint stuff and lose the bright information or the bright stuff and the faint information is lost in the noise.

Leon the Canon 85mm F1.8 is as good as any L series lens in image quality. It does not qualify as one as it is not dust and moisture proof. It is one of Canons best kept secrets and is only (gulp) $600 Aus.

I am just having fun experimenting and sharing anything that might help others with their imaging. I know that I have learnt a lot from others.

Bert

[tornado33]

gee well done, especially barnards loop, and in no way looks overprocessed, but quite natural. Glad to see some are geting good weather, been socked in here for weeks now
Scott

[Ric]

A truly lovely widefield Bert, very nicely done.

Cheers

[ballaratdragons]

Holy Cow!!!!!! :eyepop: :eyepop: :eyepop: :eyepop: :eyepop: :eyepop:

[netwolf]

Very nice widefiled, this area of the sky has so much more to it than meets the eye and you have done well to catch it.

[avandonk]

Managed to collect more data to increase the signal to noise ratio.

Large image 2.7MB, FOV 16x24 degrees.

http://members.optusnet.com.au/~cheekyfish/OR_85mm.jpg


Details
Canon 5DH. Canon 85mm F1.8, Hutech LPS filter, all at ISO500.

Current data
At f/2.8, 5X2min, 10x4min, 12x8min
At f/4 , 5x( 8s, 15s, 30s, 1min, 2min)

Converted from RAW to TIFF and corrected for flats with ImagesPlus. Stacked and aligned wiith Registar. Used EasyHDR to produce a LDR image from these eight images. The dynamic range is potentially 20 bits.

I also rotated the image to thhe orientation we are all used to. I am sure it has improved.

Bert

[sejanus]

Bert thats a big call mate, as good as any L lens? :rofl:

nice pic though

[avandonk]

Sorry Sejanus I should have said of similar focal length whether zoom or prime.

See here for info about Canon lenses especially MTF diagrams and check out the 85mm F1.8 about $600 vs the 85mm F1.2L costing thousands of dollars.

http://www.usa.canon.com/consumer/controller?act=ProductCatIndexAct&fcategoryid=152

The 85mm F1.2L is only slightly better at f/1.8 than the 85mm F1.8 is at f/1.8. At higher apertures the differences are almost indistiguishable.

By the way Canon Super Telephotos are not lenses they are in a class of their own. They have two ED elements and a Fluorite element that makes them super APO's.

Not many people know that Canon make the Fluorite elements for the upmarket APO telescopes. They know who they are!

Bert

[sejanus]

Hi Bert,

What the MTF charts don't show you is that the 85 1.2 has better contrast and colour at the wide apertures. In fact the 85 1.8 doesn't really kick in contrast/colour wise until relative to the 1.2 unless stopped down a bit but the 1.2 has excellent colour and contrast right from wide open. The bokeh is also better on the 1.2 though thats irrelevant for astro of course but is important for weddings/fashion which is what I shoot. Typically you don't buy the 1.2 for any sharpness increase, but for other reasons.

cheers

[avandonk]

You are dead right if I was shooting terrestial, weddings, portraits etc with the 5DH the 85mm F1.2L would leave anything far behind. The build quality contrast and circular aperture and bokeh means nothing else is in the race.
I would buy one in a heartbeat if I could justify it. So stop tempting me!


Bert

[tornado33]

What would this lens be like
http://photosig.pcphotoreview.com/cat/pcphotoreview/digital-accessories/lenses/35mm-primes/canon/PRD_83381_3111crx.aspx
F1.0. wow thats fast

Just read a review at http://photosig.pcphotoreview.com/cat/pcphotoreview/digital-accessories/lenses/35mm-primes/canon/PRD_83381_3111crx.aspx
says it isnt that good, soft images.

[sejanus]

You don't really buy the 50/1.0 to get sharp images, it's for shooting pitch black handheld. Canon did it more as a lens mount demonstration than anything else. I havent used the 1.0, but I have the 50/1.2 and it's a cracker