Quote:
Originally Posted by Placidus
Nice timing. We watched the Maxwell Smart movie yesterday!
A great result for such a short exposure. Nicely nuanced. The HH jets toward 3 o'clock came out well.
Are the triangular stars something to do with the 6 diffraction spikes?
Best,
MnT
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Thanks MnT
Is the HH Jet around Mystic Mountain?
The 6 spikes come from the 3 spider veins in the older Mewlons. You get 6 fainter as opposed to 4 brighter. My hunch is that it is caused by collimation. I've removed the mirror a couple of times (the last time was to install the corrector) and so far all I've done is used a collimation scope to get it right. Haven't touched it under the stars yet. I get triangle stars with my RH200 and I know that's caused by trefoil astigmatism but that goes away if I shoot on both sides of meridian.
At 1.7" the stars are round, at 1.5" they start losing their shape. It's really easy to fix but I didn't feel it was worth the effort
Quote:
Originally Posted by codemonkey
Nice one Colin. Great colour, nice and sharp!
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Thanks Lee
Quote:
Originally Posted by gregbradley
That's quite an appealing image really. I think you are being overcritical of it.
The misshapen stars are only really visible in the full res image. A small amount of tilt is there as well as top right corner seems most affected.
Greg.
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Thanks Greg, you're right on both accounts
It's mostly because it didn't point where I wanted it to
I do need to fix up that corner at some stage, I know it's the bottom left corner (I flipped the image and have the camera at the same orientation as the OTA) but I'm pretty lazy about it.