I'm not a big fan of on-camera flash... it's usually too localised, too harsh. But this ring adapter makes for a useful lighting source when off-camera flash or other lighting is not a feasible option.
I did find that it hindered focusing, but if you're working at a slower pace then it is a very useful option softening shadows and giving a very pleasing and flattering light.
Unlike the version shown in black, mine's was generally made of white plastic, akin to some toilet seat accessory but this can be remedied with some black tape. The build quality is rudimentary, but the light it gives outweighs this.
I'd recommend using this with manual flash as opposed to TTL, as I found that it knocks a few stops off the exposure/power and also it's much more stable when mounted on tripod for shooting. It does add bulk and weight to the camera and I am thinking of adding some foam to the inside of the ring to couple it more centrally to the lens as it can wobble about a bit.
Other than that, I am happy with it... it does the job for me and that's all I am interested in.
