Posted By David Williams
This weekend I was "tweaking' my finder scope and decided to take a look at some trees off in the distance using a 2" university optics lense that came with my scope. Don't have it in front of me but is is larger than 40MM possibly 50MM or 60MM can't remember which.
I looked and there it was, the central obstruction. Was it the lense size or some other lense characteristic that made the CO so obvious.
This was in bright daylight BTW