This is an exceptionally fine set of optics. I have found that this set equals or exceeds my current set's optics in every way. That is very important in making sure you get excellent shots.I own a DSLR camera that has a 58mm lens but does not have a screw mount. For those with 58mm DSLR's with no screw apetures, K&F has a tape on adapter ring, this will allow you to purchase and utilize the entire set of filters demonstrated in this review.K&F has sizes of similar lenses for many other lens sizes, if your camera is other than 58mm, this review about clarity and lens function is still pertinent, but do make sure you buy the correct the lens size.FDL=Fluorescent Glass FilterThe purple coated FDL filter is used for shooting around fluorescent lights they can cause a greenish or yellow hues depending what kind. The FDL (or FLD) will keep the colors true to life.CPL: Removes unwanted reflections from non-metallic surfaces such as water or glass and glare from the sunThe CPL filter is mounted on a rotating frame and rotates freely after it is screwed on. As you rotate the lens on your camera, point the camera at a brightly light landscape, and then at a pond or a lake very near.Turning the CPL should provide distinct variations in glare and reflection. Turning the CPL over water will actually turn the water from mirror image into see-through image. This is one of my favorite and more imaginative lensesUV: Reduce haze and improve contrast to your video and digital images by minimizing the amount of ultraviolet (UV) light. Many people (including myself) will often just keep this lens always on their camera as a "lens dust cover". Since ALL the lenses are ADDITIVE, meaning that you screw one on top of the other, leaving the UV filter always on is seldom a issue.There are also three 58MM Graduated Color Filter Blue,Orange,Gray. These provides a gradual color transition for a smooth blending effect. They can add some interest mood and colorization effects that would be difficult to obtain post production. All three colors are useful, and again they are additive. Since they are mounted on rotating frames, you can turn them to different positions.Flower Petal Lens Hood: (Don't leave home without it!) Improves the contrast and image quality by preventing those scattered light and unwanted light flares from entering the lens.You also get a large dry lens cloth and new plastic lens cover with tie on cordAs I said, the optics are outstanding, the camera, even in auto-focus mode, has no difficulty focusing through multiple stacked lenses, demonstrating their clarity.Personally, through usage, I highly recommend this lens set.I received this product for my honest review, I hope my video and comments help you make an informed decision.Yours Truly,Tom, The Squirrel Whisperer