Quote:
Originally Posted by Merlin66
Top left of frame?
There's a spectrum and a secondary reversed spectrum usually caused by extraneous light and a glass edge.....
|
Hi Ken, thank you for your expert analysis, I spent hours trying to find some clues to this on the internet to no avail. Your description fits though,
I thought it might have been a finger print on the filter so I took it off to clean it & noticed the glass rattled a bit. The retaining ring had loosened,
so maybe my local light pollution (neighbors floodlights) caught an edge of the filter glass.
Sounds feasible.
I think this issue is resolved thanks to your wisdom.
Many thanks,
Tony