In Focus: Architecture, a small, but exquisite exhibition at the Getty Museum, samples a favorite subject of photographers, from the invention of the medium in 1839 to the present. Architecture in Photographs is the title of a book by Gordon Baldwin, comprising 75 images from the Getty’s fabulous collection, and assistant photography curator Amanda Maddox has selected a third of these for her exhibition. Book and show offer a fascinating commentary on the evolution of the medium and the speed of its growth. Within a decade of the first images by Daguerre in France and Henry Fox Talbot in England, photographers had fanned out across the world, recording monuments, people and natural wonders. The cameras were cumbersome, the processing laborious, but these pioneers were undeterred, and they created a priceless record of a now-vanished world. Monumental buildings were favorite subjects, because they were static, could be pictured in constantly shifting light, and offered a ready-made composition for the photographer to interpret.