Vari­able ND fil­ters

Amateur Photographer - - Technique -

Vari­able NDs are very con­ve­nient when it comes to con­trol­ling the amount of light en­ter­ing the lens. They are al­ways the screw-in type and can range in den­sity from as much as 1 to 8 stops, es­sen­tially of­fer­ing the flex­i­bil­ity of eight in­di­vid­ual fil­ters. So how do they work?

Once at­tached to your lens a vari­able ND is ro­tated un­til the de­sired den­sity is reached us­ing a scale on the side of the filter. They’re made of two sheets of po­lar­is­ing glass that darken as they are ro­tated. These fil­ters are great if you’re on a bud­get or want to keep kit to a min­i­mum, but this also comes at a small cost. Many vari­able NDs suf­fer from a large X that ap­pears in the frame when close to, or at, their high­est strength, but this is easy to avoid.

Ex­po­sure 2mins with 10 stop ND

Ex­po­sure 1-15secs

Ex­po­sure 1sec with 3 stop ND

Ex­po­sure 1-60secs

Newspapers in English

Newspapers from UK

© PressReader. All rights reserved.