Sometimes I amaze myself at how slow I am to actually go and see things in Paris that are literally on my door step, especially if they are things I am really interested in, like photography. This Museum is in St Paul, 4eme (i.e my 'hood) is in a lovely building which combines 18th century and modern architecture. The front court yard has a gorgeous Zen gravel garden of black and white raked gravel with a lovely glass sculpture.
Costs 7 Euros plein tariff. No queues. Well stocked book shop. Check it out.
Details here: http://www.mep-fr.org/us/