MY recommendation would be to visit 25 Books in Brunnenstraße:
25books, Brunnenstraße 152, 10115 Berlin | Open: Wed, Fri und Sat 14-19 Uhr | Tel: 030 437 35 707
It is located near to Bernauer Straße underground station (which is also the station for visiting the Berlin Wall memorial).
No, it is not an antiquariat - it is simply the greatest little photo bookshop in Berlin!
What you will find there are hundreds of books that you will never have heard of by generally unknown photographers. Hannes, the owner, specializes in short-run books made by photographers, his own publishing house and other publishing houses in Germany who also specialize in producing short-run artists books by photographers.
Naturally, he also has books by better known photographers - such as the recent reprint of Candlestick Park by Lewis Baltz or David Bailey's Havana.
If you visit, make sure you plan to have lots of time to browse (and some spare Euros) as you are bound to find a gem or something that genuinely surprises you.
Bests,
David
www.dsallen.de