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Lunar Halo (04 Jan)

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Author Topic: Lunar Halo (04 Jan)  (Read 3667 times)
brianb
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« on: January 04, 2009, 07:05:21 pm »

Very poor sky for observing tonight but an unusually complete lunar halo

1803 UT 04 Jan 2009. Canon 5D, 17mm, 4 sec at f/4, ISO 800

Edit: The bright "star" at the lower right is Venus .... you really do get a wide field of view with a 17mm lens on a full frame camera! Note also alpha and beta Arietis just inside the halo at the top left.
« Last Edit: January 04, 2009, 07:08:18 pm by brianb » Report Spam   Logged

rjgjr
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« Reply #1 on: January 04, 2009, 07:21:15 pm »

Beautiful shot Brian, that is a complete halo. You're right about the full frame, big difference.
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Roman White
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« Reply #2 on: January 04, 2009, 09:30:52 pm »

Nice halo, Richard  Smiley
Unfortunately, I have just the same sky on the 'clear' nights, so I don't know when I'll get a chance to see comets.
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« Reply #3 on: January 04, 2009, 10:33:12 pm »

I really think this is a great and dramatic shot for several reasons...

1) It's a complete 22 degree halo around a first 1/4 Moon...with subtle colour.

2) Venus shares the frame with the halo with great intensity with the Pleiades on the opposite side.

3) The structure of the clouds appearing to radiate to the lower LHS with folds is the icing on the cake.

All this with such a wide angle lens looks fantastic!.  Smiley
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Paul
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« Reply #4 on: January 04, 2009, 10:41:29 pm »

Brilliant shot Brian! Boy do I miss my wide angles since I gave up using film!
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jgs001
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« Reply #5 on: January 04, 2009, 11:00:02 pm »

Superb capture Brian.
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brianb
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« Reply #6 on: January 05, 2009, 12:09:19 am »

Thanks guys. I didn't think it was all that great as there is more noise in the image than I would have liked. However I did a time lapse sequence of 10 frames at 2 min intervals (should have made the interval shorter) showing the halo dying away, here it is. Please download, I'm not embedding it as  as it is 2.4 megabytes.
http://www.bbhvig.uklinux.net/Halo-Animated.gif
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Tyler
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« Reply #7 on: January 05, 2009, 05:10:58 am »

wow! that is a great wide field shot! now try putting a 10mm sigma on there! lol that would be crazy
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brianb
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« Reply #8 on: January 05, 2009, 09:06:30 am »

Quote
now try putting a 10mm sigma on there!
The Sigma 10-20mm zoom is a good lens at a very reasonable price, but on a 5D the vignetting would be far, far too much - it's designed for crop sensor cameras. For a real wide angle (not fisheye), Tokina do a 12-24mm which covers full frame. The lens I used was the Canon EF 17-40 f/4L; I've never felt the need to go wider than 17mm, had a Tamron 17mm f/3.5 in Olympus OM fitting for years & only used it a few times.
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