So i decided to have a play and ordered a 12mm extension tube. I then slapped it on my 2x extender and put my 100mm macro on the other end.
Here is the abomination in all it's glory:
The only downside, is it shoots wide open and only has manual focus as you have to block off the signal pins to not throw any errors, but the results are still stunning!

Here is the abomination in all it's glory:
The only downside, is it shoots wide open and only has manual focus as you have to block off the signal pins to not throw any errors, but the results are still stunning!

