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Grouping and Logical OR: notebook (ibm or sony) Negation: laserjet printer not monochrome Negation: printer -laser -monochrome \tGrouping and Logical OR: printer (epson or canon) (inkjet or laser) not multifunction Group Operator: printer -(dot matrix)
The ND filter lets you use a slow shutter speed even in bright outdoor scenes, and reduces the light intensity when you want to use a fully open aperture. It is handy, for example, for capturing the flow of a waterfall or using a slow shutter speed under strong sunlight.