Possible Clues:

• Camera with interchangeable parts
• Olympus OM-1, e.g
• Photography sys.
• Pro's camera, for short
• Canon shooter, briefly
• Ultrafancy Mercedes-Benz model
• Minolta Maxxum, e.g.
• 35mm camera variety
• Snap decision, for short?
• It employs a movable mirror: Abbr.