At first, I was skeptical about this filter because someone said this filter is not adjustable. That person is wrong. It is Adjustable.The filter quality is great. You can do the monitor test (i.e., 1) hold it in front of your eyes (directly, not through the camera), 2) look through it towards a brightly lit monitor, 3) rotate the CPL and you will see that the monitor will turn black and won't let light pass through.Some people said they had trouble un-attaching it from the lens because the CPL filter spins instead. In that case, slightly pull it upwards while trying to un-attach. Also, don't attach it too tight with the lens.Good luck!

Awesome filter! This is my first CPL so I can't really compare it to other CPLs, however this filter works far better than I expected based on the cheap price. I went with the filter because of Tiffen's reputation and was not disappointed. This works so well for car photography and videography by helping reduce glare from paint, windows, and wheels. I will definitely purchase more in the future once I have more lenses.

Most people into photography will instantly recognize the name K&F Concept as makers of high quality photographic equipment and these GoPro lens filters are no different. Quality multi coated optics are used in both the CPL and ND filters.With this lens set you get three ND filters (ND stands for Neutral Density - more on this in a minute) and one circular polarize filter.The CPL filter is a circular polarize lens filter. These are used for reducing glare in your videos and photos. It also helps brings out the deep blue in skies when shooting the sky, clouds, etc.You can rotate the front of the CPL lens which is a great feature as it allows you to see what effect it's having on your color in real time as you turn it.The ND, or neutral density filters act basically as 'sunglasses' for your camera's lens and sensor. They come in 8, 16 and 32 stops reduction which gives you plenty of variety and choice.One fairly typical use of a ND filter would be for taking a photo of a waterfall. You want that classic picture of a static landscape BUT with the water showing movement and flow.In order to achieve this, you'd have to deliberately overexpose the shot in order to give the water motion however in doing this, everything else in the picture (besides the waterfall) will be blown out and overexposed to the point of almost total whiteness!Now, if you place a ND filter on the lens, you're forcing the shutter to stay open longer resulting in a perfectly exposed picture with the flowing water in the waterfall.This is a great lens kit to have in your GoPro gear bag.

Great filter set compatiable with Phantom 4, metal filter rings, coated glass lens :UV and CPL is double side coated which improves light transmissionVariable ND is not coated at allND 16 is coated in the front of the lens onlyWeight of UV and ND16 is undetectable on my kitchen scale, while VariableND and CPL which have a rotatable ring design is weighted at 20 gram/7ozEven with the weight of two heavier filters, when gimbal is powered on and calibrated, they do not drag the lens head downwards (the head is pointed straight/level with horizon)Update:Tried the Variable ND filter,the image quality suffered significantly, 4k footage looks like it was shot in 720p. Nothing is sharp. So the Variable ND filter is pretty much useless.One major drawback of using this filter set is that the gimbal lock/camera protector can not be used due to extended filter ring size being bigger than the original filter ring. (See included photo) I wish there is an aftermarket lens cover that can work with this filter set.

The first thing you notice is that this camera is a whole lot smaller than you thought it was going to be. Without the waterproof case it measures a diminutive 2.75 inches wide, and the 2 inch viewing screen covers almost the entire back of the camera.The camera ships without a memory card, so when you buy one I highly recommend at least a Class 10 Micro SD card. Any HD video camera deserves it. A slower card may not record HD video quick enough to prevent problems such as having your recording stop before you're ready or, worst of all, a slow card might result in data corruption and a camera lock-up. This could be the source of some bad reviews that mention the camera freezing up. Also, you ought to respect the Busy light and do not ask the camera to do anything else while it's saving a file. Just to be safe, there is a tiny reset button on the bottom of the camera. Hope you never have to use it, but it's a better choice than waiting for the battery to expire. So far, I've recorded about 90 minutes of video and plenty of still pictures without a glitch.Focus range is 120 cm (5 inches) to infinity, but in a pinch you can go in a whole lot closer, up to a half inch with useful results. The 4x zoom is digital, so it will always reduce detail if you use it. Get closer if you can, but if not, you can always crop the pictures when you get home. As for video, as soon as you zoom in you are no longer using 720 HD. My advice: Unless you have a compelling reason, I'd say to keep the camera set at highest resolution for both stills and video, and skip the zoom. For video you actually have two good choices: 720p HD at 30 frames per second, or in case you need to see sharper motion, there is also VGA at 60 fps. Files are saved in AVI format, and either setting will look and sound very good on YouTube and Facebook.The DVR850HD includes a bike mount with extra spacers, a strap-on helmet mount, a separate tripod mount and, of course, a waterproof enclosure which has its own a tripod mount. Some reviewers have griped about the helmet mount having a strap rather than glue, but I rather like being able to move the camera to a different helmet. Perhaps the most interesting feature is hidden behind the name Vehicle Mounted Mode. No, this is not an anti-shake feature; it's a honest-to-goodness dash-cam! In this mode it will continuously record forever until the battery runs out. Every five minutes the camera automatically saves, so you don't get enormous files. And, if the card fills up, the camera is smart enough to erase the oldest file first. So, for the reviewer who complained that the camera only records 5 minutes at a time: Take it off Vehicle Mounted Mode! I recently shot over 70 minutes of HD dash cam video on a single charge, and when the power got low the camera saved the final file and shut down in an orderly fashion. How big are the HD files? Seventy minutes consumed about 10GB. To save battery power, the camera powers itself off after 5 minutes of standby. If you are in dash cam mode the view screen turns off after a few minutes of recording and a red LED continues to let you know you the camera is still on. Despite the small size, Vivitar even found room to squeeze a teensy playback speaker into the package.My one disappointment is that this camera cannot shoot while on a charger. When it recognizes a plug in the USB port it assumes you are connected to a computer, and your only two choices will be to offload the pictures or start using the Vivitar as a web cam. That's a real disappointment because it would have been ideal to leave this camera plugged in as a dash cam and never worry about recharging it.What are the pictures like? Not bad. The center-weight exposure metering gets the job done and, thanks to a coated lens, the pictures show very good color and contrast. Don't expect vivid colors underwater, though. There are technical reasons why everything turns bluish, and your favorite TV shows spend thousands of dollars to make undersea colors look more natural.The package also includes the "Vivitar Experience Image Manager" on a mini CD. At 18 MB it looked innocent enough, but after it launched a download from the Vivitar site, the final program installation exceeded 120MB. It turns out that the Vivitar experience includes an expanded product manual, (in the language of your choice), plus a picture browser/manager program that finds all the pictures and videos on your PC. It also includes icons for uploading to your favorite social sites, and it lets you can order T-shirts and mugs or create a plain vanilla slide show or custom picture frames.One word of caution: Treat the buttons with respect. You don't want to smash them like one unfortunate reviewer did. Just press slowly until the camera responds, especially if you are operating the camera through the waterproof housing.I am giving this camera a high rating, not because it outperforms much more expensive cameras, but because it is an exceptional value in its price range. Store the camera in its waterproof box for protection and to keep the screen pristine.

In my opinion it is one of the best CPL for beginners.The only downside is that while rotating the filter, it makes noises. Other than that, there's no weird vignetting or anything else.

This filter is great. I've used other CPL filters and there always seemed to be quirks about them, whether it be sticky rotations, hard to mount or un-mount on the lens, or coloration of the image. This filter had none of those issues. It goes on easily and with a positive feeling that you have some comfort it won't fall off while you're shooting, which has happened to me before, and it operates smoothly from behind the viewfinder. I have found no coloration from this filter at all, just the elimination of glare and deepening of colors where it's supposed to do so. The ring itself is nicely dimpled so that you can easily feel where to grab and turn without looking.This filter is light but feels very strong in construction, made to be used over and over for years, and it is thin enough that I had this and a matching ND filter stacked on a 16mm lens without any vignetting. I am totally satisfied with this filter and enthusiastically recommend it to anyone that needs a CPL, or needs to upgrade from what they already have.

As always I seem to not have the negative experiences other people do with these filters. It is what it is a CPL filter. Works fine, smooth and threaded perfect to my Nikon 18-105mm.