Quote Originally Posted by SmartWombat
How about the Sigma 50-500 in 4/3 mount - that's a 100-1000mm equivalent 35mm.
Surely that is long enough ?
As I said earlier, if one wanted a long enough lens in the 4/3 system, one needed to be comfortable buying one of the long Sigma lenses. That lens is one of them - the other is the 135-400mm.

I personally wouldn't buy a Sigma lens without testing the specific sample I was considering buying before hand, because their quality is too variable between individual samples.