View Single Post
  #3  
Old 22-09-2010, 09:15 PM
Screwdriverone's Avatar
Screwdriverone (Chris)
I have detailed files....

Screwdriverone is offline
 
Join Date: Feb 2008
Location: Kellyville Ridge, NSW Australia
Posts: 3,306
Hi Grady,

Interesting to see an almost identical rig take a shot of M20, one of the three I have done so far with my BD200N 8" on the HEQ5 and the 1000D. (I have attached my go at this for comparison, which I rotated and flipped to be the same orientation as yours so its easier to flip compare)

First thing I noticed was the dreaded coma at the outer 1/3 edge of the field, something which is inherent in the setup, due to the fast mirror and the largeish sensor on the 1000D, you could improve this with an MPCC, which I am yet to do myself.

Second, you say over two hours, but is that two hours worth of data? or a number of shots take in a two hour period? There seems to be less red in the main section than in my shot. Don't know if that's because I only have 4.5 minutes in mine (9 x 30 sec). Also, what ISO did you use? Your star colours are more detailed as you can see in yours a distinct blue hue in the NW bright star which shows as white in mine.

I am not sure if the 8" you have is an F5, or you have cropped the image as my field is much wider?

Overall though, an impressive result, perhaps if you have significantly more data than me, the red area pics up more of the blue, I don't know, but its a damn fine effort all the same.

Cheers

Chris
Attached Thumbnails
Click for full-size image (M20IISa.jpg)
197.4 KB20 views
Reply With Quote