I am wanting to use my Nikon TC's with my big Sigma, and wondering if anybody here has modified their Nikon TC for use on other manufacturer or non-S lenses, or modified a non-S lens mount tab so the converter will mount?
I have read that most folks grind the offending tab off the female converter mount, and this seems like an easy solution, though it voids warranty. It also allows stacking a 2x in front of a 1.4X or 1.7x, or stacking 2 2x's, which could be cool. The other option seems to adding (grinding) an S notch to the appropriate tab Sigma male mount for a cleaner final solution. Of course here a mistake is far more costly and requires a very steady hand, and why I suspect it isn't done as much.
Anybody here done either and care to share results?
And yes, my Dremel tool is waiting...