Possible Clues:

• Bit of photog. equipment
• The Pentax ME-F was the first one with autofocus
• Letters in the camera biz
• Photographic initials
• Digital camera type: Abbr.
• Camera type, in short
• Snapper's choice, briefly
• Photographic sys.
• Pentax Spotmatic, e.g., in brief
• Professional's camera, for short