Best budget lens for the pentax k 5 ii?

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From Pentax K-5 II: Pentax K-5 II: A DSLR by Pentax with a 16.3-megapixel APS-C sensor, announced in 2012. The K-5 IIs is the same camera without an anti-aliasing filter. Specs - Maker: Pentax - Mount: Pentax K - Sensor: APS-C, 23.5 x 15.6mm, crop factor 1.5 - Resolution: 16.3 megapixels - Stabilisation: in the body - Announced: 2012 - Type: DSLR Focal lengths on it Lenses frame like 1.5 times their focal length on full frame: ...

From Pentax K-1 Mark II: Pentax K-1 Mark II: A DSLR by Pentax with a 36.4-megapixel full frame sensor, announced in 2018.

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