Pentax has issued firmware updates for its K-5, K-r and 645D DSLR cameras.

Pentax has issued firmware updates for its K-5, K-r and 645D DSLR cameras.

Updates to the K-5 and K-r increase the maximum selectable ISO setting in Bulb mode to 51,200 and 25,600 respectively.

The K-5 and K-r DSLR updates also deliver ?improved functional sequence of Contrast AF and improved total speed until focus is done?, according to Pentax.

Updates for all three cameras enable compatibility with SDXC memory cards.