Thread: Odd issue
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Old 21-03-2018, 07:48 AM
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LewisM
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It's an OSC SBIG STF-8300C CCD Peter..I know you don't read checklists

Suavi - the baffle I had made removes the spikes. It chokes the light path down to 83mm just in front of the objective, so the foil spacers are not ever any longer "exposed" to the light path. THis was installed AFTER Running Chicken. I tested this setup on Betelgeuse and on Canopus to see if it removed it, and indeed it does, so no, it is no longer the foil spacer issue.

What concerns me is it appears to bee a combined effect - the poor readout is what worries me the most, with SEVERE vignette, bad colour blotching etc. The prior ones on NGC 3132 seem just fine, then bang - off it goes with odd spikes, "hard" blue and red blotching etc etc, almost like the electronics had a heart attack.

So the issues are:
1. odd spikes
2. odd halos/fuzzy edges
3. severe vignette (never been seen in prior 10 min subs)
4. colour oddities/blotches.

Here's a jpeg of the full combined frame - forget the noise, it's the vignette I'm showing here and the fact the specifically produced flats did nothing. Also shown is the prior run of 3132 - you can see flats removed just about all issues and very little vignette present (not counting the red sky glow). All mere screen transfer stretches in PI.
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