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Peter Bresler

Trifid Nebula, m20

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M 17

Started by maurice clark, 08/29/2002 10:06AM
Posted 08/29/2002 10:06AM Opening Post
This image is a combination of 3, 1-minure exposures taken with an 8" f/10 LX200 and an ST-8E.



Attached Image:

maurice clark's attachment for post 1430

* Teach a man to fish and you feed him for a day.
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Posted 08/29/2002 06:01PM #1
Hi Maurice-

Too bad a sattelite went through your fov.

Posted 09/16/2002 11:37AM #2
Nice image! I note taht you have three images. Have you tried using a median combine? That should eliminate or at least greatly reduce the visibility of that satellite track.

Also, your white point looks to me to be a little bit too low. Or perhaps you added these images? You may have saturated if you added. An average is just as good as a sum, but prevents white saturation. If you did average, then perhaps the 1-minute exposures are a bit too long - more exposures of a shorter duration would give you more detail in the bright areas.

So the cure depends on the methods you used; if you need more informaton on any of these methods, just ask.

Ron Wodaski
author of "The New CCD Astronomy"

Ron Wodaski
New Astronomy Press