This book is technical but very accessible at the same time .. He taught me a lot about how to use the flash or both indoors and outdoors. I read it twice and am far from having all integrated. If there is a book gain on the photo it is the technical 'lighting Manual flash. But above all, it must then use it again to move to practical work, because if the theory is useful, nothing can replace practice. But beware, the technique phot flash application acquired several flashes, sync cords, light boxes, light stands, etc. A must read for anyone who wants to do anything other than to frame and press the shutter button.