Art history is littered with throwback references — that is, artists referencing and borrowing from the work of creative predecessors. But in an era of relentless digitization, it’s refreshing to encounter photographers who make processes — and even equipment — of yesteryear completely their own. “Time Lapse” at the Shelburne Museum’s Pizzagalli Center for Art and Education offers just that: 13 artists whose images using tintype, cyanotype and camera obscura techniques address modern-day realities including AIDS, environmental crises and identity politics. Some of the artists expand the materiality of the photographic medium, as well. Keliy Anderson-Staley’s “Shelter in Place” is a shed-size structure lined inside and out with tintype portraits of Houston survivors of 2017’s Hurricane Harvey. Annie Lopez makes actual clothing from cyanotype on paper, such as a dress titled “The Writings of Miss Osorio.” David Emitt Adams’ tintype images of Arizona oil refineries are printed right on the lids of 55-gallon oil drums. This is an exhibit that looks back and forward at the same time.