Quote Originally Posted by Dr Croubie
And thanks Jan, that pretty much exactly what I was hoping for, no need to go nuts on the accuracy (if the canon is a bit smaller than the samyang that's good, because the main complaint about ebay knock-offs are that they're too loose). And that's a popular enough product, ebay-ripoffs are down to $7 shipped so cheap enough for experimenting. (cheap rings for the 70-300L are up at $50, it's too new a product and no competition yet, I can wait on that)

No problem, I had seen the Ebay prices already. I personally would definitely try it out before buying any expensive stuff. If it works, show your work please...I just love panorama's!