"Bombs, bullets and rockets were the usual weapons on aircraft flying over Europe during the Second World War but it was often the camera that proved the most deadly. Photographs provided the generals and intelligence officers with vital information that they used to direct their forces or to out-guess the enemy.
Thousands of the photographs aircrew risked their lives to bring back are now being made publicly available for the first time. The first batch of 4,000 pictures that have remained in storage since the war go online today in a project to make up to 10 million air reconnaisance pictures available."
http://www.independent.co.uk/news/uk/this-britain/rafs-wartime-reconnaissance-photos-go-online-in-new-archive-1825926.htmland this is the link for the archive:
http://aerial.rcahms.gov.uk/Fascinating. I've just spent the afternoon looking through the photos of Hamburg, looking for my house.