Pentax 645 mount
Two digital bodies and a lens pool going back to 1984. The 645Z uses the same 51MP Sony sensor as medium-format backs costing three times as much, and the older FA 645 autofocus glass from the film era mounts and works on it. Only the four AW lenses are weather sealed; everything else, including the HD-badged 35mm, is not. The 28-45mm is a DA lens, meaning its image circle covers the digital sensor only and it will not work on a 645 film body.
2 bodies and 20 lenses tracked. Lowest used prices pulled daily from the major used-gear sites.