It is simply necessary to take for granted that this telescope has an aperture of 138 mm instead of the stated 150 mm. For this money, such an aperture is not bad.
and take for granted at the same time a linear CO of as much as 44%. Which is not so good. But we can't help it which I slowly take for granted, too
Edited by quilty, 11 May 2021 - 12:38 PM.