Historical clue formulations

• Protective cover for a camera — 2023-09-11
• Accidental "subject" of certain snapshots — 2023-04-23
• Often-lost camera part — 2019-10-07
• You can't focus when this is on — 2016-01-16
• Glass protector — 2013-08-31
• Shot blocker — 2013-01-06
• Shot blocker — 2002-06-07
• Photograph ruiner, perhaps — 2000-12-26
• Photographer's cover — 2000-10-01