Astronomy educator/Sidewalk astronomer
Owner of Astronomy Delight franchise
18 inch f4.42 Dob on eq platform w ST120 f/5 finder
12 inch Zhumell Dob
8 inch f/6.9 home made Dob with Seevers optics
William Optics red 10th Anniversary 80mm FD
C8 XLT on Vixen GPDX
26lb eyepiece box
Cernan Space Center astronomer
Member of Northwest Suburban Astronomers
... and still the best wife I could wish for!
150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
Quote:I'll agree that a CO helps for evenly bright very close pairs, but my experience is otherwise with noticeably uneven close pairs. The diffraction effect of extra light going from disc into rings does make an unhelpful difference with the uneven close ones. And that's despite good quality optics, well-collimated, and decent seeing.