Henry Diltz was the official photographer at the legendary Woodstock music festival back in August 1969. Here’s a 6-minute video by Keeper in which Diltz tells the story of how it all happened (note: there’s a bit of nudity). Diltz says he got the gig after an acquaintance, lighting director E.H. Beresford “Chip” Monck, suggested the photographer to Woodstock co-creator Michael Lang. The festival sent Diltz $500 — about $3,500 in today’s money — and an airline ticket to get…