01-09-2020, 07:51 AM
Parfocal just means that the lens stays in focus while changing focal length (zooming) right? What is special about that? My old 70-200mm f4 L IS USM is parfocal, as are probably all Canon 70-200mm lenses. Only when I add extension tubes, it loses this parfocalness (which is expected). I think that most zoom lenses I have used were parfocal.
I don't see what the bonus is when it is normal for such a lens.
I don't see what the bonus is when it is normal for such a lens.