This post is a compilation of links to material, reviews, tests, user opinions and feedback on the Pentax D-BG4 battery grip and its use on the Pentax K-7 digital SLR camera.
Full attribution is given by linking to the source and where available, the author’s homepage or photo gallery.
Photos of the D-BG4 / K-7 combination
Thanks to Ned Bunnell who posted eight images showing the combo from every possible angle.
According to the blog post, the photos were taken with a Pentax SMCP-FA 50mm f/1.4 lens mounted on the Pentax K20D.
You might like to read a forum reaction (on DPReview) to these images.