Blondel
布朗德尔(光高度单位，等於π流明每平方米球面)

• prerotation
• presbyopia
• presbyopia lenses
• Prescription spectacle lens
• prescription work
• preselected stop
• preselection of aperture
• preselection of shutter speeed
• preselector
• pre-sensitizing
• presentation
• presentaton of information
• preservative
• pre-set
• preset aperature ring
• pre-set control
• preset diaphragm
• preset lens
• preset stop
• preshoot
• press
• press button
• press button control
• pressed glass
• press fit