This JJC ND filter is a fixed 10-Stop Neutral Density Filter that provides a 10-stop exposure reduction. It allows you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily. Neutral density filters do not affect the coloration of the image and are ideal for pairing with other filters. Say Goodbye to X cross, vignetting, reflections or blur in the picture which happens on a variable ND filter when use wide angle lenses at higher ND values, a fixed 10-stop ND filter won't have these issues. It fits for any lens with 49mm filter thread, below are a few lens with 49mm filter thread for your reference: Canon EF-M 15-45mm f/3.5-6.3 IS STM Lens Canon EF 50mm f/1.8 STM Lens Sony E 18-55mm f/3.5-5.6 OSS Lens Sony E 35mm f/1.8 OSS Lens Sony E 50mm f/1.8 OSS Lens Sony E 55-210mm f/4.5-6.3 OSS Lens Sony FE 28mm f/2 Lens Sony FE 24mm f/2.8 G Lens Fujifilm XF 16mm f/2.8 R WR Lens ...... Why we need a Neutral Density Filter? -- It enables slow shutter speeds to be used, especially with high speed ISO, to record movement in subjects such as waterfalls, clouds. -- It decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background -- It decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situation -- It allows cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure.