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Hi all,
As an update. I think a couple of things were going on.
1) I wasn't getting close enough to the eyepiece. I noticed last night when I went in a bit closer the obstruction disappeared.
2) until last night I had no idea how badly a stray light can affect the view. a neighbour turned a backyard light on and all of a sudden I was looking at all sorts of weird things.
Also, on the night in question there was a big temp drop as soon as the sun went down. I remember picking up my compass and the underside was covered in water droplets.
Cheers
Mick
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