Oh OK thanks, so it is an extension tube like the Kenko?
I thought Canon only made two extension tubes: a 12mm tube and a 25mm tube
The present stocks’ Product Codes are:
Extension Tube EF12MkII
Extension Tube EF25MkII
So if you are referring to either of these two products - then I suggested buying the Kenko set of THREE tubes.
Not that it matters to me all that much, but I am still at a loss as what is this "4x" tube, as extension tubes are referenced by their length and not a numerical multiplier.
I am only asking for clarification so I might better respond to your initial question.
WW