<p>Christopher S: did you decide and buy the K-50? I think the built-in flash on the K-50 works great, at least for short range (up to 20 feet). I also have used the older version of the AF360 with P-TTL, and that works well too, may be of more use for things like weddings. I bought the older AF360 used on E-bay for two reasons, lower cost and also the new version of this flash does not have a stand-alone automatic mode (though the new version is weather sealed which the old unit is not). With the auto flash mode I can use this flash with other cameras, such as my Sony NEX5N.</p>