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Beginner CCD image: M57
This is a beginner shot from a Meade DSI of the Ring nebula consisting of 50
stacked images with 0.775 sec exposure. http://tek1systems.com/astro/wp-cont.../RingCropped3- 7_10_20101.jpg --- Synchronet 3.14a-Win32 NewsLink 1.85 www.ohiofreenet.org - telnet://tek1systems.com |
#2
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Beginner CCD image: M57
On 7/22/2010 3:02 PM, sjohns wrote:
This is a beginner shot from a Meade DSI of the Ring nebula consisting of 50 stacked images with 0.775 sec exposure. http://tek1systems.com/astro/wp-cont.../RingCropped3- 7_10_20101.jpg --- Synchronet 3.14a-Win32 NewsLink 1.85 www.ohiofreenet.org - telnet://tek1systems.com Looks about like my first effort 50 years ago with film. I needed a 10 minute exposure to do as well. Why such a short exposure time? Even an alt azimuth mount should do far longer reducing read noise by a factor of 4 or 5 times giving an even better image. 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". |
#3
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Beginner CCD image: M57
To: Rick Johnson
From Newsgroup: alt.binaries.pictures.astro On 7/22/2010 3:02 PM, sjohns wrote: This is a beginner shot from a Meade DSI of the Ring nebula consisting of 50 stacked images with 0.775 sec exposure. http://tek1systems.com/astro/wp-cont.../RingCropped3- 7_10_20101.jpg --- Synchronet 3.14a-Win32 NewsLink 1.85 www.ohiofreenet.org - telnet://tek1systems.com Looks about like my first effort 50 years ago with film. I needed a 10 minute exposure to do as well. Why such a short exposure time? Even an alt azimuth mount should do far longer reducing read noise by a factor of 4 or 5 times giving an even better image. Rick Just starting out... It is a CCD camera, and so far I don't see much of an improvement compared for a DSLR. I have it on an equitorial mount. Yes, a longer exposure would be better - I am experimenting with that. -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". --- Synchronet 3.14a-Win32 NewsLink 1.85 --- Synchronet 3.14a-Win32 NewsLink 1.85 www.ohiofreenet.org - telnet://tek1systems.com |
#4
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Beginner CCD image: M57
Main difference with CCD and DSLR is cooling and the DSI has none. So
I'm not surprised you see little difference. DSLR is blocked for H alpha unless the IR filter is modified so it will be better for emission nebula that are rich in H alpha over an unmodified DSLR. Even a poor equatorial mount should track for 15 or 20 seconds. Most will go at least twice that. Some frames my be lost but just pitch them and stack the good ones. Each time you read and image noise is included. By going longer you add far less of this noise. Add guiding and you can go far longer. Open star clusters and bright planetary nebula are good targets for the camera. Lots of both in the skies right now for you to choose from. Rick On 7/23/2010 5:14 PM, sjohns wrote: To: Rick Johnson From Newsgroup: alt.binaries.pictures.astro On 7/22/2010 3:02 PM, sjohns wrote: This is a beginner shot from a Meade DSI of the Ring nebula consisting of 50 stacked images with 0.775 sec exposure. http://tek1systems.com/astro/wp-cont.../RingCropped3- 7_10_20101.jpg --- Synchronet 3.14a-Win32 NewsLink 1.85 www.ohiofreenet.org - telnet://tek1systems.com Looks about like my first effort 50 years ago with film. I needed a 10 minute exposure to do as well. Why such a short exposure time? Even an alt azimuth mount should do far longer reducing read noise by a factor of 4 or 5 times giving an even better image. Rick Just starting out... It is a CCD camera, and so far I don't see much of an improvement compared for a DSLR. I have it on an equitorial mount. Yes, a longer exposure would be better - I am experimenting with that. -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". --- Synchronet 3.14a-Win32 NewsLink 1.85 --- Synchronet 3.14a-Win32 NewsLink 1.85 www.ohiofreenet.org - telnet://tek1systems.com -- 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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