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First go at imaging with new rig

Started by Nerd3D, 08/03/2008 09:30AM
Posted 08/03/2008 09:30AM Opening Post
This is my first real go at imaging. Spent most of last year debugging the mount and guiding setup. (and the operator) This is the Dumbbell taken last night. It was really hot and the DSI seems to put off a lot of noise when it's like 90 outside.

36 * 60" frames Meade DSI pro
Home brew 8" newt on LXD 75 mount
Autoguided with a DSI
Stacked in DSS post in PS

I could use some guidance on post work. I'm not really sure what I'm doing. I just fuss around till it looks less bad. I need to get my work flow down before I take any real shots.

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Nerd3D's attachment for post 43123
Posted 08/05/2008 01:10AM #1
Very promising Charles!

[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue grin
Amateur Imager
Posted 08/05/2008 12:25PM #2
Hi Charles,

Your off to a great start smile

Your guiding/tracking looks great.
When it is very warm noise does become a problem.A good basic calibration can go a long way to help reduce it though.It looks like there were probably quite a few hot pixels left in the subs when you stacked this up,probably causing some of the streaks/noise in your image.

A good master dark frame will really help with this,something like 30-50 darks with some kind of data rejection or a median combine would do it.

Since you can go a minute with good guiding I would next try 3-5 minutes and see how that goes.

Your off to a great start,practice makes perfect wink

Jason
Posted 08/06/2008 12:50PM #3
This definitely counts as a "real" image. You are right about the temperature being a factor. I will second the comment on getting a good median of a bunch of darks (I usually don't do more than 10, but am never even close to that warm.)

I don't know about DSS stacking. (?) I have come to like Sigma Beta Combine, which you might want to try.

Charlie


Fort Lewis Observatory: (37.238, -108.052) ~2360m (7744 ft.) elevation.
Darkness - typically 6.5+
Scope - Meade 16" LX200; f6.3 focal reducer
Focus - JMI Smart focus
Camera - SBIG ST-10XE; (~.5"/pixel)
Guiding - AO-8 and/or Meade 5"/DSI/PHD
http://www.fortlewis.edu/observatory