Can any body help me please? Iam looking to purchase a 150 - 500mm sigma len to fit my olympus E30 but I understand that Sigma do not make this len in a 4/3 fit any more. so iam looking for a used one or should I buy a 2x converter for my 70 - 300mm ??????
While putting a x2 teleconverter on your (what I presume is a Zuiko ED 70-300 f/4-5.6) lens will give you a 140-600mm, which sounds all well and good, you have to remember the 2 stop loss. The maximum aperture will change from F/4-5.6 to f/8-f/11.
Unless your subject is stationary or its a nice bright day, you'll probably suffer with motion blur from resulting slow shutter speeds.