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ASTRO: First light Atik 383: NGC 4274 area
Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The
same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan |
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ASTRO: First light Atik 383: NGC 4274 area
You're going to have a lot of fun with that big chip! Can't wait to see
more. Stefan Lilge wrote: Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan -- Adriano http://www.edmar-co.com/adriano/ 34°14'11.7"N |
#3
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ASTRO: First light Atik 383: NGC 4274 area
"Stefan Lilge" wrote in message ... Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan very nice Stefan Can your camera read more pixels than are actually on a line? So can you tell it to read 3500 pixels from a line? if so we can get it to overscan and I can walk you through how to do a photon / dark transfer curve characterization you will measu 1) read noise 2) full well 3) camera gain 4) photo response non-uniformity 5) dark signal non-uniformity 6) linearity no special tools or calibrated light sources are needed. If you can do this, it would be great to add to my collection of other 8300-based cameras. I have measured the U8300, ML8300, QSI583 and today am working on the ST8300 from SBIG. The ATIK383 would be a nice addition to the list rdc |
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ASTRO: First light Atik 383: NGC 4274 area
On 4/21/2010 3:13 PM, Stefan Lilge wrote:
Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan That covers a lot of real estate very nicely! How does its dark current compare to your Sony chip cameras? BTW, the wolves I hear howling aren't fenced in nor the black bear that took out my neighbors bird feeders she forgot to take in. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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ASTRO: First light Atik 383: NGC 4274 area
Richard,
I would be interested in this, but I did not find an option in the drivers or software to read the overscan area. Also I have to send the camera back for repairs as the shutter does not work reliably any more, so I will probably not have the camera at my disposal for some weeks (which is a pity as I am going on a two week astro trip to the Austrian mountains on May 8). Stefan "Richard Crisp" schrieb im Newsbeitrag m... "Stefan Lilge" wrote in message ... Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan very nice Stefan Can your camera read more pixels than are actually on a line? So can you tell it to read 3500 pixels from a line? if so we can get it to overscan and I can walk you through how to do a photon / dark transfer curve characterization you will measu 1) read noise 2) full well 3) camera gain 4) photo response non-uniformity 5) dark signal non-uniformity 6) linearity no special tools or calibrated light sources are needed. If you can do this, it would be great to add to my collection of other 8300-based cameras. I have measured the U8300, ML8300, QSI583 and today am working on the ST8300 from SBIG. The ATIK383 would be a nice addition to the list rdc |
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ASTRO: First light Atik 383: NGC 4274 area
Rick,
five minute darkframes have three ADU higher background than bias frames at -20degrees, so I would say that dark current is neglegible. The Kodak chip has a lot more "warm" pixels than the Sony chip of my SXV-H9 camera though, but they usually can be taken care of with a hot pixel filter in AstroArt. Stefan "Rick Johnson" schrieb im Newsbeitrag . com... On 4/21/2010 3:13 PM, Stefan Lilge wrote: Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan That covers a lot of real estate very nicely! How does its dark current compare to your Sony chip cameras? BTW, the wolves I hear howling aren't fenced in nor the black bear that took out my neighbors bird feeders she forgot to take in. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#7
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ASTRO: First light Atik 383: NGC 4274 area
With all the subs you take I'd think dithering and a sigma stack would
remove the warm pixels without needing a filter. Sorry about the shutter issue. What does it use, a leaf shutter? I've never had an issue with the rotating shutter in the STL and it gets a lot of use all night long most clear nights when the moon isn't too strong. At least it is under warranty. Rick On 4/23/2010 11:06 AM, Stefan Lilge wrote: Rick, five minute darkframes have three ADU higher background than bias frames at -20degrees, so I would say that dark current is neglegible. The Kodak chip has a lot more "warm" pixels than the Sony chip of my SXV-H9 camera though, but they usually can be taken care of with a hot pixel filter in AstroArt. Stefan "Rick schrieb im Newsbeitrag . com... On 4/21/2010 3:13 PM, Stefan Lilge wrote: Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan That covers a lot of real estate very nicely! How does its dark current compare to your Sony chip cameras? BTW, the wolves I hear howling aren't fenced in nor the black bear that took out my neighbors bird feeders she forgot to take in. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#8
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ASTRO: First light Atik 383: NGC 4274 area
Rick,
the camera has a rotating shutter which is supposed to give useful results down to 0.2 second exposures. It worked well the first three nights, but now it tends to stay open. Of course I could do a "manual shutter" by covering the scope during readout ;-) Stefan "Rick Johnson" schrieb im Newsbeitrag . com... With all the subs you take I'd think dithering and a sigma stack would remove the warm pixels without needing a filter. Sorry about the shutter issue. What does it use, a leaf shutter? I've never had an issue with the rotating shutter in the STL and it gets a lot of use all night long most clear nights when the moon isn't too strong. At least it is under warranty. Rick On 4/23/2010 11:06 AM, Stefan Lilge wrote: Rick, five minute darkframes have three ADU higher background than bias frames at -20degrees, so I would say that dark current is neglegible. The Kodak chip has a lot more "warm" pixels than the Sony chip of my SXV-H9 camera though, but they usually can be taken care of with a hot pixel filter in AstroArt. Stefan "Rick schrieb im Newsbeitrag . com... On 4/21/2010 3:13 PM, Stefan Lilge wrote: Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan That covers a lot of real estate very nicely! How does its dark current compare to your Sony chip cameras? BTW, the wolves I hear howling aren't fenced in nor the black bear that took out my neighbors bird feeders she forgot to take in. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#9
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ASTRO: First light Atik 383: NGC 4274 area
For decades in my film days I used an Exa camera body that had a shutter
that would open but not close. Since you couldn't flip the mirror prior to exposure I used the hat trick both to open and to close the exposure. Once capped I could advance the film which did close the shutter, and drop the mirror of course. I don't want to go back to those days! Good luck on the trip, at least you still have the old cameras I hope. Rick On 4/23/2010 7:01 PM, Stefan Lilge wrote: Rick, the camera has a rotating shutter which is supposed to give useful results down to 0.2 second exposures. It worked well the first three nights, but now it tends to stay open. Of course I could do a "manual shutter" by covering the scope during readout ;-) Stefan "Rick schrieb im Newsbeitrag . com... With all the subs you take I'd think dithering and a sigma stack would remove the warm pixels without needing a filter. Sorry about the shutter issue. What does it use, a leaf shutter? I've never had an issue with the rotating shutter in the STL and it gets a lot of use all night long most clear nights when the moon isn't too strong. At least it is under warranty. Rick On 4/23/2010 11:06 AM, Stefan Lilge wrote: Rick, five minute darkframes have three ADU higher background than bias frames at -20degrees, so I would say that dark current is neglegible. The Kodak chip has a lot more "warm" pixels than the Sony chip of my SXV-H9 camera though, but they usually can be taken care of with a hot pixel filter in AstroArt. Stefan "Rick schrieb im Newsbeitrag . com... On 4/21/2010 3:13 PM, Stefan Lilge wrote: Last Friday I received my new Atik 383L+ camera (Kodak KAF8300 chip). The same night I went for a two night outing to dark skies (which unfortunately had mediocre transpareny and bad seeing). We were imaging in a deer park with two packs of wolves howling in nearby fences. At least night temperatures fell below zero, so we were not attacked by any mosquitoes. First image was the region around NGC 4274 in Coma. As usual exposure time for RGB was not long enough to give good colours, so they are only hinted at in this picture. Distance between reducer and camera was 6mm too large, which led to distorted stars near the edge. I'll take better care next time. Taken with Atik 383L+ camera, Skywatcher ED120 plus 0.85 reducer on a H-EQ5 Synscan mount, 7x15 minutes Lum, 1x15 minutes each for RGB (2xbinning). http://ccd-astronomy.de/temp3/4274colourgut.jpg Stefan That covers a lot of real estate very nicely! How does its dark current compare to your Sony chip cameras? BTW, the wolves I hear howling aren't fenced in nor the black bear that took out my neighbors bird feeders she forgot to take in. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#10
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Hi Stefan
I saw your post about the shutterproblem in your ATIK 383. I have the same camera and my shutter doesn't close either. I'm curious to know what your experience was. Did they fix it or what happened? Morten |
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