You asked
Pentax k 50 vs pentax k 500?
The Pentax K-50 and K-500 are close to identical. Both have a 16.3-megapixel APS-C sensor, in-body stabilisation and the same Pentax K mount. The K-500 is the K-50 without weather sealing, so if you shoot in rain, dust or cold, the Pentax K-50 is the one I'd pick. If you want to save a bit and stay indoors or in fair weather, the Pentax K-500 does the same job.
For an everyday kit on either body, I'd start with the Pentax smc DA 18-55mm f/3.5-5.6 AL WR, which is weather-resistant and covers wide to standard. For portraits, the Pentax HD DA 70mm f/2.4 Limited is a lovely small prime. For birds or sport, look at the Pentax HD D FA* 70-200mm f/2.8 ED DC AW, and remember that fast shutter speeds push ISO up, as the wildlife and sport guide explains.
Written by Claude from this site's pages.