vwestervelt
11th of October 2003 (Sat), 13:59
I've had several requests to post some of the images I'm getting from my new Digital EOS.
Here is a link to an image I've taken of NGC498 - Triangulum Galaxy. (more to come when the weather improves)
The image is not retouched, but is color level adjusted. The CCD array used in this camera is more sensitive in red/green than in blue. With extremely low light photo's such as this, it's very evident in the raw frame.
The image is 50% of actual size.
30 second exposure @ ISO 1600
The lens assembly I'm using on my telescope is designed for a flat field but does have spherical aberration, which is evident. The trade off is a nice flat field imaging area at F2. Telescope w/out this lens assy is an F10- 2032mm. This a a very faint object in the night sky, the F2 lens really helps as you can do shorter exposures and limit telescope tracking errors (Rotation of the earth would not allow this image w/out motorized tracking!)
I'm still looking for a way to get a dark frame with this camera to subtract noise if anyone has any ideas.
Link
http://www.vernwestervelt.com/Galaxy/Triangulum.htm
Please let me know what you think. I'm very happy with this camera so far.
Vern Westervelt
Here is a link to an image I've taken of NGC498 - Triangulum Galaxy. (more to come when the weather improves)
The image is not retouched, but is color level adjusted. The CCD array used in this camera is more sensitive in red/green than in blue. With extremely low light photo's such as this, it's very evident in the raw frame.
The image is 50% of actual size.
30 second exposure @ ISO 1600
The lens assembly I'm using on my telescope is designed for a flat field but does have spherical aberration, which is evident. The trade off is a nice flat field imaging area at F2. Telescope w/out this lens assy is an F10- 2032mm. This a a very faint object in the night sky, the F2 lens really helps as you can do shorter exposures and limit telescope tracking errors (Rotation of the earth would not allow this image w/out motorized tracking!)
I'm still looking for a way to get a dark frame with this camera to subtract noise if anyone has any ideas.
Link
http://www.vernwestervelt.com/Galaxy/Triangulum.htm
Please let me know what you think. I'm very happy with this camera so far.
Vern Westervelt