My Tamron 70-300 VC on my V1 with FT-1. Boom! 810mm for free! OK, I already owned the Tamron and V1. But just got the FT-1. I'm excited. My Nikon 70-200 F2.8 becomes 540mm at F2.8. Sure, it's only with a limited use 10MP camera, but it's still really nice for telephoto.