Tim­ing it right

NPhoto - - Over To You -

When work­ing with neu­tral den­sity fil­ters to ex­tend shut­ter speeds, it’s im­por­tant to cal­cu­late the re­quired length of the shut­ter speed in or­der to cor­rectly ex­pose your im­age. When us­ing a 10-stop ND this is cru­cial, as the re­sult­ing time can be sev­eral min­utes long, and 30 sec­onds ei­ther way can un­der- or over­ex­pose an im­age, mean­ing you have to start over. Adam ex­per­i­mented with this and used the Lee Fil­ters app on his smart­phone to de­ter­mine the ex­po­sure length.

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