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#1
July 8th 03, 02:35 PM
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Stacking...?
Hi Chaps
I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Thanks Rob -- ________________________ http://robert.thegeakes.co.uk/ 51:21N 00:23E 
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#2
July 8th 03, 03:53 PM
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Stacking...?
On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake"
wrote: Hi Chaps I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Can you give any idea what they look like? Ideally, a link to them? -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#3
July 8th 03, 03:53 PM
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Stacking...?
On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake"
wrote: Hi Chaps I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Can you give any idea what they look like? Ideally, a link to them? -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#4
July 8th 03, 04:33 PM
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Stacking...?
Both tries are linked below...
Most images are at least half a meg..Sorry! Result = 0result.jpg for both cases... http://robert.thegeakes.co.uk/astro/m27/ http://robert.thegeakes.co.uk/astro/m13/ Rob "Pete Lawrence" wrote in message ... On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake" wrote: Hi Chaps I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Can you give any idea what they look like? Ideally, a link to them? -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#5
July 8th 03, 04:33 PM
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Stacking...?
Both tries are linked below...
Most images are at least half a meg..Sorry! Result = 0result.jpg for both cases... http://robert.thegeakes.co.uk/astro/m27/ http://robert.thegeakes.co.uk/astro/m13/ Rob "Pete Lawrence" wrote in message ... On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake" wrote: Hi Chaps I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Can you give any idea what they look like? Ideally, a link to them? -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#6
July 8th 03, 04:56 PM
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Stacking...?
On Tue, 8 Jul 2003 15:33:58 +0000 (UTC), "Robert Geake"
wrote: Both tries are linked below... Most images are at least half a meg..Sorry! Result = 0result.jpg for both cases... http://robert.thegeakes.co.uk/astro/m27/ http://robert.thegeakes.co.uk/astro/m13/ M27 or M57? If I don't get the call of the pub tonight (heh heh heh - unlikely) I'll have a look - I've downloaded them all... -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#7
July 8th 03, 04:56 PM
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Stacking...?
On Tue, 8 Jul 2003 15:33:58 +0000 (UTC), "Robert Geake"
wrote: Both tries are linked below... Most images are at least half a meg..Sorry! Result = 0result.jpg for both cases... http://robert.thegeakes.co.uk/astro/m27/ http://robert.thegeakes.co.uk/astro/m13/ M27 or M57? If I don't get the call of the pub tonight (heh heh heh - unlikely) I'll have a look - I've downloaded them all... -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#8
July 8th 03, 08:58 PM
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Stacking...?
"Rob Pollard" wrote in message ... Hi Rob, Check your inbox  Just had a go at processing the M13 images and I'vesent my results. Overall the images are quite noisy, which limits what you can do with them. I found the best way of stacking it was to use a Median combine and not a sum combine. This way the noise levels are vastly reduced. Also if you look at the histograms of the images on your website, there is room for improvement simply by moving the black and white points. Hope this helps. BTW M27 looks suspiciously like M57!! Doh! -- Regards Rob Pollard My Astro CCD page is: http://www.robpol.demon.co.uk "Robert Geake" wrote in message ... Both tries are linked below... Most images are at least half a meg..Sorry! Result = 0result.jpg for both cases... http://robert.thegeakes.co.uk/astro/m27/ http://robert.thegeakes.co.uk/astro/m13/ Rob "Pete Lawrence" wrote in message ... On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake" wrote: Hi Chaps I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Can you give any idea what they look like? Ideally, a link to them? -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#9
July 8th 03, 08:58 PM
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Stacking...?
"Rob Pollard" wrote in message ... Hi Rob, Check your inbox Just had a go at processing the M13 images and I'vesent my results. Overall the images are quite noisy, which limits what you can do with them. I found the best way of stacking it was to use a Median combine and not a sum combine. This way the noise levels are vastly reduced. Also if you look at the histograms of the images on your website, there is room for improvement simply by moving the black and white points. Hope this helps. BTW M27 looks suspiciously like M57!! Doh! -- Regards Rob Pollard My Astro CCD page is: http://www.robpol.demon.co.uk "Robert Geake" wrote in message ... Both tries are linked below... Most images are at least half a meg..Sorry! Result = 0result.jpg for both cases... http://robert.thegeakes.co.uk/astro/m27/ http://robert.thegeakes.co.uk/astro/m13/ Rob "Pete Lawrence" wrote in message ... On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake" wrote: Hi Chaps I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Can you give any idea what they look like? Ideally, a link to them? -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy
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#10
July 8th 03, 09:01 PM
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Stacking...?
"Robert Geake" wrote in message ... Hi Chaps I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Here's my attempt on M57 only, lifes too short to wait for M13 on a dial up :-( http://www.leadbeaterhome.fsnet.co.uk/M57_temp.htm Aligned and stacked with k3ccdtools Low histogram point set to reduce noise High histogram point set to stretch contrast Gamma increased to 1.8 to stretch faint detail Red curve tweaked in photoshop to bring out colours in ring Robin
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