The dual macro flash lets you illuminate the subject with two flashes that can be set to different intensities, creating a beautiful play of shadows on the subject. Dual lights can be rotated around the ring installed in your lens. Each head can also rotate left/right around its axis and up/down. You can also detach the flashlights from the ring and place them anywhere, which is easier if you use <A HREF="http://www.amazon.com/DUAL-ARM-Macro-Bracket-camera-flashgun/dp/ B00AR9JSP2">DUAL-ARM Macro Flash Mount for Canon Nikon R1C1 Speedlight Black</A> which is a nice addition. Without this accessory, this flash can be directly attached <A HREF="http://www.amazon.com/Canon-MP-E-65mm-Macro-Cameras/dp/B00009XVD5">Canon MP-E 65mm </A>. When using this flash with <A HREF="http://www.amazon.com/Canon-100mm-Macro-Digital-Cameras/dp/B002NEGTSI>"Canon 100mm f2.8L Macro</A> , you need the <A HREF="http://www.amazon.com/Canon-Macrolite-Adapter-67/dp/B002O3UOUW">Canon Macrolite Adapter</A> to attach the lens attached flash.I Use this flash with both Canon MP-E65mm and Canon 100mm f2.8L lenses for great results. My macro photography improved to some extent, realizing I needed a macro flash to get further I ordered this unit. Then I could develop my skills further. I highly recommend this camera instead of the macro flash <A HREF="http://www.amazon.com/Canon-MR-14EX-Macro-Digital-Cameras/dp/B00004WCI7">Canon MT-14EX</ A> because the MT-24EX lets you move the light sources while the MT-14EX can only rotate around the lens. However, if you just need to move your light sources around the lens, the MT-14EX is a great flash! Another difference is that the MT-24EX has a higher guide number than the MT-14EX, which allows it to illuminate objects at a considerable distance. However, in the world of macro photography, it simply means you can get more light output when you need it. This is by far the best macro flash you can get from Canon.