Depends on what you mean by direct sunlight. If you mean the filter pointed directly at the sun, and you are worried about lens flare, well it wont stop that. But if you mean using it out in bright bright sunlight all around, then it works great. I'm a member of the Longview Film Club. We shoot indie short films, and use these for all of lenses and cameras. It's a must when shooting outside under almost any conditions. Makes it possible to get nice Depth of Field even on a sunny day. 

The way u tell is to look at the end of you lens. There will be a 0 with a slash / through it and a number behind it. Match that number to the 58 of this neutral density filter. 

we recommend that you should reduce the density of the filter until "X" cross or trailing smear disappears. 

hello ,you can use ie take picture of the sun, but not for the solar eclipse 

hello the K&F Concept Slim UV Filter + Slim Circular Polarizing Filter (CPL) + Neutral Density Filter + Slim FLD does not work for work for the solar eclipse