Shootar401 said:
I figure Pentax TTL would be Pentax TTL regardless of model, I just won't have access to the newer features, which I don't need anyway.
The TTL that comes in film cameras is
ENTIRELY DIFFERENT from the current xTTL found in digital cameras today!
Film TTL uses a sensor in the TTL body to measure light send from the TTL flash and falling onto the film plane, and when the light is measured to be 'enough', the body sends a 'Quench' command to stop the flash from sending any more light.
Digital xTTL uses an xTTL flash that has 'preflash' capability, the body then reads the amount of light seen by the lens, and then xTTL body it sends a 'Output Predetermined Amount of Light' command to the xTTL flash a moment before the shutter opens.
Many (but
not necessarily all!) current digital TTL flash units can be put into film TTL mode, so it can accept the 'Quench' command from the TTL body.