Promaster makes a series of P-TTL compatible flashes, and also has a module-based line. The module-based models require the 5050DXR/PX digital flash module.
Warning: The 7500EDF flash is the only model that works with the Pentax K-7, K-x, or K-r camera bodies. You will need at least firmware release V3-310, which should be the default in all currently-shipping units. Without this update, it will just fire at full power in all conditions. If you have an earlier version, the update can be performed (for free) by Promaster Service — contact them for details. In August 2010, Promaster stated that they were working on an update for the 7200EDF and 7400EDF, but more than a year later, that has not happened. Promaster has not tested the 7500EDF with the K-5.
- 5250DX — a very simple module-based model with a tilt head and non-zooming reflector.
- 5550DX — still basic, but this module-based flash adds a tilt and swivel head. This model appears to be out of production.
- 5750DX — a more powerful module-based flash with a non-motorized zoom and a secondary reflector.
- 7200EDF — a basic P-TTL-dedicated model, roughly comparable to the Pentax AF360FGZ in power.
- 7400EDF — another dedicated model, this one with a motorized zoom.
- 7500EDF — Promaster's top P-TTL-dedicated model which adds more power and features, including a swivel head and a secondary reflector.
As with the Sigma flashes, firmware upgrades (if available) must be performed at the factory.
And Promaster also has a macro ring flash, the MacroLume TTL Digital. This is module-based, and uses the same modules as the 5000-series flashes. Promaster informs me that modules and flash units shipped from the warehouse after August 2008 have the proper codes to communicate with then-current Pentax dSLRs, but that earlier copies may need to be sent in for an update. And see the note above: the K-7/K-x and newer don't work at all, although one can use the manual-control module instead.
