[AZ-Observing] Re: Faint nebulosities surrounding M42

Hi Andrew.  You are correct about blending different exposure lengths. 
About 95% of the picture was shot on December 4-5 with the luminance being a 
series of 24 ten minute exposures (not counting the exposures I had to toss) 
and the color data which were 5 minute subs binned 2x2.   The brightest 
parts of the nebula saturated my chip and turned completely white which is 
what I expected.  I then used data from last year's picture to fill in those 
parts that were saturated because I felt I couldn't improve on those areas 
this year because I was using the same equipment.  Those exposures ranged 
from 5 seconds to 2 minutes.  The 5 second exposures were about as long as I 
could go without saturating the trapezium with my F/3 scope.

Jon Christensen


----- Original Message ----- 
From: "Andrew Cooper" <acooper@xxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Thursday, December 15, 2005 11:08 PM
Subject: [AZ-Observing] Re: Faint nebulosities surrounding M42


> Jon,
>
> Your data didn't say, but I assumed you blended a couple images of
> different exposure lengths to get both the core and the faint stuff in
> the same image.  Details?
>
> Andrew
>
> Jon Christensen wrote:
>
>>Hello fellow Arizona stargazers,
>>This is a photo of the Orion Nebula I took out at Vekol the night of 
>>December 4th/5th.  My goal for this picture was to concentrate on bringing 
>>out the faint nebulosities that surround the nebula.  I got a hint of them 
>>with last year's picture and I've been waiting a year to have another go 
>>at it and see what I found.
>>
>>http://members.cox.net/jonc97/images/astro/nebula/m42_2005.htm

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