Is celebrity photographer Rose Hartman truly “incomparable,” as the title of this modest documentary breathlessly promises? Well, that seems to be a matter of individual taste. It is fair to say that her breezy biography (which she co-executive produced) falls a little short. But if you share Hartman’s trifecta of obsessions — photography, fashion and fame — you’ll find plenty to appreciate. First-time director Otis Mass has assembled an impressive collection of talking heads to support his thesis: that Hartman deserves a full-length film of her own. Simon Doonan, Donna Karan, Carolina Herrera, Patrick McMullan, and Phillip Bloch are among those.