I'm looking to buy a ring flash for close portraits or macro photography. The proprietry ring flashes are WA-A-AY too expensive... so I'm looking at 3rd party ones like Suntax RF14AFC (the last C for Canon. Nikon's N and Minolta's something else) which costs $125 from TCW.
However, that day I went to try it out on my FZ20 (62mm thread with Phayee adaptor) and I had a 62-55. The flash was 52mm but it includes a 55-52 so I tried it on. To my dismay, there was vignetting until 3x zoom.
So I'm thinking, are there any 3rd party ring flashes out there that can fit my FZ20 without vignetting?