Pentax DA* 50-135mm f2.8 ED (IF) SDM for $750 [and two more]

For a limited time (good until 12/12/15 at 11:59pm ET) B&H Photo has a sale on the following three Pentax lenses:

+ Pentax DA* 50-135mm f2.8 ED (IF) SDM for $750
+ DA 16-85mm f3.5-5.6 ED DC WR for $450
+ Pentax 1.4x HD PENTAX-DA AF Rear Converter AW for K-Mount Lenses for $450