Excerpt: This is great for close up medical photography. I primarily use this for teaching case examples of lesions, and finally can capture perfect details. I started using it for general macro purposes as well, and have some wonderful images.
Summary: I held off on buying this for a long time saying, "That is one ridiculously overpriced piece of junk." However, at some point, all macro photographers realize that they need more light. To get a sharper photo, you have to stop down the lens. Unfortunately, when you stop down the lens, you need much more light. Enter Canon's ring lite. When in auto mode, the ring lite is brain dead simple to operate. Just attach it, point, and shoot.
Summary: Ein recht nützliches Blitzgerät, wenn man mit dem Canon-Lupenobjektiv arbeitet. Wohl ohne Alternative. Ist zwar teuer, aber ohne dieses Blitzgerät sind Fotos von 5 facher Vergrößerung nicht machbar.