I'm curious as to what the technology of the early electronic flash sensors was. As far as I know, the Honeywell Srobonars of the early 70's had their Auto Strobonars, as far as I knew in 1971. Or was it earlier? There were the Sunpaks,, Vivitars, Metz, and probably gobs of other manufacturers offering automatic flashes back then. Was the sensor just a variation of the CdS cell as used in the camera TTL meters? I remember in the mid-70's when the "silicon blue" technology started becoming all the rage. Lord only know what it is now. But I'm talking about the old flash sensors of a Honeywell 770, for instance. Was the flash sensor just a CdS cell? The reason I ask is that the reaction time, memory, and failure rate (lifespan) of CdS mete rcells is widely known. I have a Gossen Luna-Pro, which serves me well. But you have to hold down the on switch for a few seconds before the meter rises all the way. So what was in the early electronic flash sensors? Thank you.