Hi, does anyone tried a teleconverter for 45mm? I see someone tried some olympus tc, but c160/c180 are not very cheap, and difficult to find. Is there something cheap and easy to find, that also gives a 2x without loose too much sharpness and light (at max. 2.8)? yes, I know a dedicated lens would be better, but 35-100 or 75mm are too expensive for me, and sigma 60 2.8 is too short.