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Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower)
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K&F Concept K Pro 37mm ND Filter Slim Variabler Graufilter ND2-400 Neutral Graufilter: Amazon.de: Elektronik & Foto
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The Stopper Range of long exposure filters from LEE Filters - Little Stopper, Big Stopper and Super Stopper.
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