Got a cheap Olympus B-300 1.7x teleconvertor on ebay and was wondering if it is possible to use this on the 40-150mm Olympus m.zuiko lens? The B300 is big and heavy while the 40-150mm is small and light and with the teleconvertor on the front I am concerned it may damage the lens or focusing motor. I tried the Olympus B300 1.7x teleconvertor on my Minolta MD 135mm lens and it works fine there but only gives an EFL of 340mm (on a Sony Nex) so no real advantage over my Olympus 40-150mm (300mm EFL + autofocus) whereas on the Olympus lens and camera it would be around 500mm - big difference. :smile: Or should I just look for a cheap manual focus telephoto legacy lens (200mm or more) to use with the B-300? Bit tricky focusing maybe, but will be on a tripod so should be steady. If so, any good cheap telephoto legacy lenses to look for?