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Old 27-09-2006, 02:27 PM
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EzyStyles (Eric)
I HATE COMA!

EzyStyles is offline
 
Join Date: Jan 2006
Location: Melbourne, Victoria
Posts: 3,208
Happy but baffled... ETA Carina

hi guys...
im so confused right now. Last night i spent from 4pm - 2 am and only captured 1 single object before the clouds came in. The Baader MPCC came in the mail yesterday and it works 'i think' perfect for my F/4 scope can also screw 2" eyepeices in.

The problem, i have attached 2 crop images of Lagoon single frame. The first one as you can see from the bright star diff spike, it is in focus but the stars are elongated. The second pic the stars are nicely rounded but the diff spike from the bright star isnt in focus?? I only noticed this after using the MPCC. I also tried Merlin's Lumicon Coma Corrector same problem. I have played around the collimation last night it didn't help. Its not guiding/tracking as I was monitoring the autoguiding the entire image.

Later in the night, i imaged ETA the stars look more rounder with focused diff spikes?? maybe due to the object closer to the SCP?

I really don't know.. Im beginning to dislike F/4 scopes.

Oh the Baader MPCC works magic! Compared to my previous ETA shot without it, There is hardly any coma at all.
Attached Thumbnails
Click for full-size image (1.jpg)
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Click for full-size image (2.jpg)
39.1 KB38 views
Click for full-size image (ETA-7x5mins_ISO800.jpg)
142.8 KB63 views
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