Comments for Galactic Images Blog http://www.galacticimages.com/blog Astrophotography by John Chumack Tue, 02 Jun 2009 07:18:13 -0500 hourly 1 http://wordpress.org/?v=3.0.3 Comment on “Capturing a Comet” by KrisBelucci http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/comment-page-1/#comment-61 KrisBelucci Tue, 02 Jun 2009 07:18:13 +0000 http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/#comment-61 da best. Keep it going! Thank you da best. Keep it going! Thank you

]]> Comment on “Capturing a Comet” by admin http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/comment-page-1/#comment-19 admin Tue, 21 Apr 2009 19:56:39 +0000 http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/#comment-19 Hi Clint, Yes, the CCD's or CMOS Chips in digital cameras are Linear, meaning if you stack them they are cumulative. The information isactually in a single 4 minute exposure, but often is very dim, until you add more light,(many exposures) then it builds upon itself , until you get what is equivalent of one long exposure. There is a freeware out there called Deepsky stacker...just google it....this will allow you to give it a try. Best Regards, John Chumack Galactic Images Hi Clint,

Yes,

the CCD’s or CMOS Chips in digital cameras are Linear, meaning if you stack them they are cumulative. The information isactually in a single 4 minute exposure, but often is very dim, until you add more light,(many exposures) then it builds upon itself , until you get what is equivalent of one long exposure. There is a freeware out there called Deepsky stacker…just google it….this will allow you to give it a try.

Best Regards,
John Chumack
Galactic Images

]]> Comment on “Capturing a Comet” by Clint http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/comment-page-1/#comment-18 Clint Tue, 21 Apr 2009 16:54:51 +0000 http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/#comment-18 Hi John, Thank you for the 'how to' sections - I'm trying to get into astrophotography myself, and am slowly learning how to get some decent images. I did have a question here, though - you mention you take four 4-minute exposures and stack them to make an effective 16 minute exposure. I wonder if you could explain (or provide a site) how this works. My assumption is that if you have a DSLR and you snap one 4-minute exposure, then snap a new 4-minute exposure, you're simply getting a completely new image. Even if you stack them, the same amount of light would hit the sensor, and you wouldn't receive any different image aside from maybe removing noise from the picture. Somewhere my assumption goes wrong, but I'm not sure where. I'm really interested in this, since I have a NexStar that doesn't allow for extended exposures due to the mount. Thanks! Hi John,

Thank you for the ‘how to’ sections – I’m trying to get into astrophotography myself, and am slowly learning how to get some decent images. I did have a question here, though – you mention you take four 4-minute exposures and stack them to make an effective 16 minute exposure. I wonder if you could explain (or provide a site) how this works.

My assumption is that if you have a DSLR and you snap one 4-minute exposure, then snap a new 4-minute exposure, you’re simply getting a completely new image. Even if you stack them, the same amount of light would hit the sensor, and you wouldn’t receive any different image aside from maybe removing noise from the picture.

Somewhere my assumption goes wrong, but I’m not sure where. I’m really interested in this, since I have a NexStar that doesn’t allow for extended exposures due to the mount.

Thanks!

]]> Comment on “Capturing a Comet” by Marcy Radbill http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/comment-page-1/#comment-17 Marcy Radbill Sun, 19 Apr 2009 16:03:49 +0000 http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/#comment-17 Love the blog John. The 'how to' segments with photos are wonderful, as well as a tribute to your knowledge and skill. Keep them coming. Love the blog John. The ‘how to’ segments with photos are wonderful, as well as a tribute to your knowledge and skill. Keep them coming.

]]> Comment on SuperNova in NGC4088 Spiral Galaxy by Elcorin http://www.galacticimages.com/blog/2009/04/supernova-in-ngc4088-spiral-galaxy/comment-page-1/#comment-16 Elcorin Sat, 18 Apr 2009 23:11:00 +0000 http://www.galacticimages.com/blog/?p=44#comment-16 Greatings, Super post, Need to mark it on Digg Have a nice day Greatings, Super post, Need to mark it on Digg
Have a nice day

]]> Comment on M97 The Owl Nebula & M108 Spiral Galaxy by John http://www.galacticimages.com/blog/2009/04/m97-the-owl-nebula-m108-spiral-galaxy/comment-page-1/#comment-15 John Thu, 16 Apr 2009 14:00:16 +0000 http://www.galacticimages.com/blog/?p=21#comment-15 Thanks Ron, Cheri and Rick, I'm glad you like my new blog.....I'll keep them coming as long as I get more clears skies. Thanks Ron, Cheri and Rick,

I’m glad you like my new blog…..I’ll keep them coming as long as I get more clears skies.

]]> Comment on M101 Face On Spiral Galaxy by John http://www.galacticimages.com/blog/2009/04/m101-face-on-spiral-galaxy/comment-page-1/#comment-14 John Thu, 16 Apr 2009 13:52:18 +0000 http://www.galacticimages.com/blog/?p=32#comment-14 Thanks Dale, Glad you like the blog! Thanks Dale,

Glad you like the blog!

]]> Comment on “Capturing a Comet” by John http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/comment-page-1/#comment-13 John Thu, 16 Apr 2009 13:51:12 +0000 http://www.galacticimages.com/blog/2009/04/capturing-a-comet-with-a-dslr-camera-tripod/#comment-13 thanks Guys, I'll keep the images and updates coming! thanks Guys,

I’ll keep the images and updates coming!

]]> Comment on April Lyrid Meteor Shower by John http://www.galacticimages.com/blog/2009/04/april-lyrid-meteor-shower/comment-page-1/#comment-12 John Thu, 16 Apr 2009 13:48:14 +0000 http://www.galacticimages.com/blog/?p=39#comment-12 Glad you liked the Meteor Alert post, Keep in mind that you have 2 nights to view the peak, it should be visible on both the night of the 20th and the night of the 21st of April 2009. Best Regards, John Chumack Glad you liked the Meteor Alert post,

Keep in mind that you have 2 nights to view the peak, it should be visible on both the night of the 20th and the night of the 21st of April 2009.

Best Regards,
John Chumack

]]> Comment on April Lyrid Meteor Shower by Doug http://www.galacticimages.com/blog/2009/04/april-lyrid-meteor-shower/comment-page-1/#comment-11 Doug Thu, 16 Apr 2009 12:05:02 +0000 http://www.galacticimages.com/blog/?p=39#comment-11 Thanks, this will be an awesome opportunity... if it's clear that night! Thanks, this will be an awesome opportunity… if it’s clear that night!

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