On the other hand the expensive Deriviate from Canon, Panasonic, Sony and Co are noticeably processed hardly better or offer features that I do not need: threaded to the diaphragm in the wrong direction and thus to screw to save space on the lens or a cap / lid for dust protection ,
Due to the material should be taken when screwing but beware. What is true of metal, goes double for plastic. According to, from coming. So turn the locknut with feeling.
I use the panel in conjunction with an exotic 41.5 to 58mm adapter on my Panasonic SD99. The tulip shape of the aperture allows me to take advantage of the maximum wide-angle of 28mm to produce without vignetting (shadows on the screen).
Finally, I got what I expected. Price performance ratio so.