Quote Originally Posted by waileong View Post
If Zeiss can measure it, so can you.
That would certainly be true ... IF you had the proper equipment. That would include a surface plate, the proper lasers and sensing cells, sundry other bits and pieces, as well as computer and programs. Not likely that the average photographer, no matter HOW dedicated to their craft, or those addicted to the "discuss lens design until you drop" syndrome would be so equipped.

I've read the "SQL" testing BS before ... Subjective Quality Level tests --- and one does well to remember that the first "S" indicates "Some wild guess".

All we mere mortals have is our sensory opinions... and, to tell the truth, I think those are more than sufficient, if nothing like accurate.