February 8, 2018 [originally published in CV94 in Spring 2013] — The title phrase of this catalogue, Light Years, is a pun on an oft-misused term. Although widely thought to refer to a measurement of time, it is actually an astronomic unit measuring the distance travelled by light over one year. What meanings can this term have when applied to a historical survey exhibition of photographic practices around 1970? Aside from the obvious…