View Full Version here: : Saturn 31-3-2009
rat156
01-04-2009, 09:54 PM
Hi All,
Saturn from last night.
I cheated and stacked some separate stacks to make a composite image. Didn't have any detail of the clouds on the ones I've checked so far and this smooths the image out a bit.
Added the best of the single images. An animation showed differences between the images due to exposure and framerate, but little or no difference in the planet itself.
Cheers
Stuart
mental4astro
01-04-2009, 10:22 PM
Fine image Stuart,
I don't do any imaging, just good old eyeballing.
Curious, how does atmospheric turbulance affect the ability to take a sufficent number of 'photos' at high power.
Question might be 'amateurish', but more awkward. I guess I'm sort of asking, you must take a heck of a lot of shots?
Alex
rat156
01-04-2009, 10:55 PM
Hi Alex,
I, like most of the guys here use a webcam to take video, then software to stack the individual frames into one still picture.
This one is a combination of 5 movies, each of 1500 frames, of which the best 500 to 1000 are selected and stacked.
I use a monochrome ccd to get the luminance, then add the colour from another webcam that takes colour movies.
Cheers
Stuart
iceman
02-04-2009, 06:49 AM
Lovely sharp image, Stuart. Good colour. Nice job.
rat156
02-04-2009, 08:02 AM
Hi Mike,
Thanks. I was a bit concerned about the colour, looking at Bird's great pics, but then I saw the Hubble shots of the Titan transit, so they are supposed to be pastels. I tried to bring a little more colour out in the image, but It looked overprocessed.
The blue fringe is the hardest bit to get rid of, the skies down here have been terrible lately, a slow moving weather system giving us very smoggy skies, which I suspect are the cause of the problem.
Cheers
Stuart
lacad01
02-04-2009, 11:35 AM
Nice one, very impressive!:thumbsup:
rat156
02-04-2009, 09:32 PM
Added best single image. Which do you prefer?
Cheers
Stuart
Screwdriverone
02-04-2009, 09:42 PM
Door number one please Stuart,
Both are pretty damn good though.
Great work!
Regards
Chris
mental4astro
02-04-2009, 10:11 PM
Hi,
They both tell slightly different stories, first more polished, second more as you might see it through the eyepiece.
Another Q. In using webcams, is polar alignment as critical when using todays' modern mounts , or the GPS style fork mounted SCT?
Eyepiece projection?
Alex
rat156
02-04-2009, 10:18 PM
Hi Alex,
Polar aligment is not important, it's irrelevant. You can do this Alt-Az or even untracked, though at long focal length it'll move out of frame pretty quickly.
Can't answer the eyepiece projection question, never tried it. I try and keep as little glass between the object and the CCD, cheap glass doesn't work at high magnifications, and expensive glass is, well, expensive.
Cheers
Stuart
Inmykombi
03-04-2009, 08:03 PM
Very nice details there Stuart.
Am I correct in saying that the rings look like they are opening up a bit again ?
Keep em coming.
Geoffro.
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