DPStewart
Veteran
I'd say the Speedbooster is a must-have. It's opened up a whole new world of glass on my GH4.
Just justify the expense by telling yourself that it's basically a lens, and it's magic.
SB
Heh...Dude.
The Speedbooster needs to like stay on Panny DSLR's ALWAYS. There's just no downside to it.
My GH2's were about the be kicked to the curb when I got a pair of those inexpensive Mitakon boosters...POW! Like a whole new camera.
If you can afford the ones with the aperture control rings then you have everything. No limits.