Which lens diameter categories are cited as standard for cameras in the material?

• A. 1/4, 1/2, 3/4
• B. 1/3, 1/2, 2/3
• C. 2/3, 1, 3
• D. 1/5, 1/2, 3/5

Answer: (D)

Lens diameter categories are a way to categorize camera lenses by common, historically used sizes. The material you studied lists one-fifth, one-half, and three-fifths of an inch as the standard categories. This trio shows up because the industry has long used fractional-inch sizes to describe lens formats, which helps technicians quickly gauge compatibility with camera bodies and the expected imaging performance. The correct answer aligns with what the material specifies as the standard set, making it the best choice for this exam. Other size groupings aren’t presented in the material as the standard, so they don’t match the referenced standard in this context.