As stated here (http://forum.getdpi.com/forum/showpost.php?p=272005&postcount=57)
I'm using my 45-200mm together with a 1.7x Teleconvertor Olympus B300 to mimick a 100-300 original Pana lens.
The focal length range becomes 77-340mm.

So far, the tests have been positive.

In short : AF works well, I notice no vignetting, the IS works well, sharpness is excellent, contrast is OK, colour rendering is OK, ....
Even the bokeh is pleasing in my eyes

I bought this convertor for 25.00 Euro from Ebay, and I'm very happy with it so far.

Here's a few pics for you to appreciate :

I'm looking forward to your comments and opinions on this !

C U,