This site is in Japanese, but has some very interesting results relating to some top end refractors.

http://homepage3.nifty.com/cz_telesc...acter_test.htm

you can translate it into English using. http://www.systranbox.com/systran/box

Just for information the two taks, toa130 and 150 get best ranking, even over the AP apo's.

Just thought I would post this for those of you who have refractors.