To qulify for a place in my camera collection, the camera has to be older than my first SLR (1981) and to be in full working condition. The SLR's are currently either M42 or Pentax K mount cameras. Medium format negative limit is 6x6 as this is currently the largest size my darkroom equipment can hanldle. (Note: the Synchro Box produces 6x9 negatives but I don't really use it that much :)