[Yakim]

[quote name='Brightcolours' timestamp='1281268694' post='1582']

As you know (you say you have used your 10-22mm with 12mm extension tube), the focus gets shifted to close to the front element, that thesubject is from about 3 cm from the front element to touching the front element.



Now add 2 more CM to the length of the lens, and you get why it matters, the length of the lens. Where with the MK I the subject will almost touch the front element, with the MK II focus can actually shift past the front element inside the lens. Only because of the extra length of the lens.[/quote]



That indeed sounds logical but I wonder if anyone has actually tried it.



[quote name='Brightcolours' timestamp='1281268694' post='1582']

Now if you would be able to find a 9mm extension tube which routes through the electrical contacts...[/quote]



I can do without electrical contacts. My Mirex adapter (Mamiya 645 lenses to EF) has no electrical contacts and it works fine in Av and M, which is what I use for 99.99% of my shots. The problem is to actually find one.