P50 HDOF CTLR DESCRIBED NEAR LOSS OF SEPARATION WHEN BOTH HE AND APCH CTLR FAILED TO OBSERVE CONFLICT AT 8000 FT BTWN ACR AND PHOTO ACFT.

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I WAS WORKING SANTAN HDOF; THE RADAR ASSIST POS FOR THE SANTAN SECTOR (S DEP). AT THE ABOVE NOTED TIME; A B757; A DEP; WAS CLRED DIRECT TFD VOR; ABOVE 30 NM SSE OF PXR. AT PXR180007; THE B757 WAS SBOUND CLBING THROUGH 7800 FT FOR FL210. AT APPROX THE SAME POS WAS AN A320; NWBOUND ON THE SUNSS5 ARR TO PHX. NEITHER I NOR THE RADAR CTLR SAW THE POTENTIAL CONFLICT. THIS WAS BROUGHT TO OUR ATTN BY THE CIC ABOUT 5 MINS AFTER IT HAPPENED. POTENTIAL CAUSES FOR OUR DISTR WAS THE ATTN GIVEN TO A PHOTO FLT BTWN 15-25 MI E TO SE OF PXR BTWN 5000-5500 FT. EVEN THOUGH THIS ACFT WAS VFR; WE ARE REQUIRED TO PROVIDE CLASS B SEPARATION AT THAT DISTANCE AND ALT. I; AS THE HDOF CTLR; WAS ALSO INVOLVED WITH COORD WITH AN ADJACENT SATELLITE SECTOR CONCERNING ANOTHER ACFT WHICH WAS IN POTENTIAL CONFLICT WITH THE PHOTO FLT. I AM CERTAIN ALL THESE FACTORS CONTRIBUTED TO MY NOT OBSERVING THE POTENTIAL CONFLICT BTWN ACR X AND ACR Y. MY SUGGESTION WOULD BE TO RESTRICT PHOTO MISSIONS; WHICH MUST ENTER CLASS B AIRSPACE; TO PERIODS OF LIGHT OR NO TFC.