What about cheap vivitar wide converter (mainly x0.45)? I've seen that they are very cheap,you can get it for 40$...I have in mind to attach one of this converter to my canon fd 28 f 2.8 in order to achieve a 25-mm-like FoV for my video (I use gh1 and gf1)...what about its performance (vivitar or other cheap wide converter in general)? A friend of mine has told me that 28 2.8 fd + vivitar wide converter 0.45x is pretty similar to the panny 14mm as lumonosity (but it's really less sharp)
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