49MM Filter,K&F Concept Neutral Density ND2 ND4 ND8 ND Lens Filter Set for Digital Camera Compatible with Alpha A3000 NEX-3 NEX-5 NEX-5N NEX-6 NEX-7 To enable slow shutter speeds to be used, especially with fast films, to record movement in subjects such as waterfalls, clouds, cars, seas etc. To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background. To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which would normally cause over-exposure. Compatible with Sony Alpha A3000 and the NEX series (NEX-3 NEX-5 NEX-5N NEX-6 NEX-7 NEX-F3) cameras with the E 18-55mm, 55-210mm Brand of K&F Concept manufactured by a professional team,24 Month Manufacturer Warranty,100% Satisfaction Guaranteed.