I got offered this book by my friend, I found quite a lot of surprising things still small by browsing the book, it says at one point: "the depth of choice" instead of "depth of field "on page 7 if I remember correctly the case is classified as APSC sensor housings (not bad this one !!), the canon 35mm f / 2 IS USM costs 300 (700 here and there and a few euros !! ), on the few pages I come it's not bad though ...