An overall Buy-In rate over 39% and some softness in the higher price tiers came together to dampen the results of the two-part Photographs auction last week at Sotheby’s. A vintage “Migrant Mother” print by Dorothea Lange took the top lot honors, but there weren’t enough positive surprises to buoy the overall numbers, leading to Total Sale Proceeds (of roughly $2.52M) that came in well below the low end of the aggregate pre-sale estimate range.... Read on.