The Metz 26 AF-1 or AF-2.... would be a pretty small p-ttl solution... i dont know anything about its controller functions or if it offers those ...
I use Cactus V6II transceivers... with the newest firmware, they act as 100% P-TTL transceivers.
they are pocketable, reliable, -you dont have to care about optical transmission- because it works on radio, and the system has a big and bright future...
Because.. according to what I have read recently, Cactus-Image will soon bring a Studio-Flash, that will integrate into this X-transceiver or P-TTL-transceiver system
(depends on what firmware you choose... it sports a small usb port and you can upgrade it, edit profiles, etc, change firmware for having either 100% P-TTL or interoperability with other makers flashes)
So it will be the 2nd 100% P-TTL Studio-Strobe option, right after the new Cononmark Strobes...
Soon we will have 3 PENTAX dedicated studio-strobes to choose from:
Cactus
Priolite
Cononmark
That is a bit off topic... but i was so excited when I read this on the Cactus-Forum.(i couldnt help it. I had to state that here.)
I am so f. happy.