You asked
Pentax k 7 vs pentax k r?
Both are Pentax APS-C DSLRs on the same K mount, with in-body stabilisation, so they take exactly the same lenses. The main difference is the sensor. The Pentax K-7 has 14.6 megapixels to the Pentax K-r's 12.4, and it came out a year earlier, in 2009 rather than 2010. If the extra resolution matters to you, I'd take the K-7.
For lenses, the Pentax HD DA 16-85mm f/3.5-5.6 ED DC WR is a sensible everyday zoom on either body. For reach, try the Pentax HD DA 55-300mm f/4.5-6.3 ED PLM WR RE. For low light and portraits, the Pentax smc DA* 55mm f/1.4 SDM is my pick.
Written by Claude from this site's pages.