Is this for real? I thought it had gone out of print in that desultory way that long-in-the-tooth titles go skulking away, but B&H says it's in stock. I ordered one, so we shall soon find out.
If it's true, then Canon's still #1. For some time now, you see, I've subscribed to the Theory of the Book, which holds that whichever camera company has a book out is the leading camera company. Nikon had at least two in the '70s and '80s, and Olympus published the excellent The OM System Lens Handbook of revered memory in about '84, or maybe '86 it was, in the brief moment of its ascendancy (before it decided it could forego autofocus). Since the EOS system got its legs under it, it's been The EF Lens Book, now in its third edition and hanging on in print if that listing is to be believed. Unless I'm mistaken, no other camera company has a similar publication, at least not officially.
(I don't know how well my Theory would stand up to actual research. Ernst Wildi's Hasselblad books were at least semi-official. Could you count Willard Morgan's Leica Manual from the '50s or Herbert Keppler's The Pentax Way from the '60s? I guess not, because admitting third party titles brings a plethora of confusions into play. Well, some theories are better left lightly tested.)
The entire text of the Canon book is available for free online. That doesn't count in terms of the Theory. (I do recommend that you download the penultimate chapter, "Optical Terminology & MTF Characteristics." An excellent primer on optics, cogent and readable.) I'm waiting, as I have been patiently waiting for a dozen or more years now, for the Next Book—it will be a portent, a bellwether of a change in dominance at the top. Maybe, pace the previous post, the next book will be "Photography With an iPhone" from Apple, written by "Mac" from the Mac and PC commercials....