Interesting Tom.
I almost bought an AP160 a few months ago but unfortunately the seller seemed quite dodgy and it was a lot of money so I pulled out.
I see quite a bit of vignetting around bright stars (the bars going through the bright stars). Much like the FSQ106N does on the bright stars at the edges of images. I wonder where that came from. Your 155 does not do that and neither does my 140 with 155TCC.
I take it this is a rentascope scope?
Greg.
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