Avuncular Dick Van Dyke is not so avuncular in “Negative Reaction,” playing a photographer who fakes his nagging wife’s kidnapping, murders her, then kills the ex-con who he’d framed for the snatch. Luckily, Columbo is focused on the task, brushing away a film of uncertainty, ever ready to develop a solution to the case through the lens of crimefighting (What??- ed.). Photo-taking person Kevin O’Mara (klophoto.com) joins Jon and RJ for this snapshot of- oh god, I’m sorry about the photographic stuff. It’s been a long day. Please just listen. Photography.