i like the filter, is good and when i step on the gas the car is a little better!

Beware of use with step rings. It is extremely difficult to remove if over tighten on to a step ring.

Just received & tested ASAP: photos taken with and without CPL filter. For my camera Canon Powershot SX40HS I strongly recommend the 52-58 step-up adapter the bayonet style not the threaded one (I purchased and tested both): It's easy and faster to install/remove. Once fixed the CPL on the 52-58 step-up adapter I'll leave them together always. This will prevent thread cuts and misalignmentsCPL usage - It makes the difference even I was expecting a little bit more cutting of the reflexions but for the money spent it's very good. Tested at 90 degres (as all indicate) vs sunlight direction and the stones are visible in the pond due to reflexions cut at water surface. As you increase the angle the more effective it is: it's doing the job! At the beginning you need a little experience till you find the max open and max closed positions (CPL ring rotation) then you play with the ring for effects. I'm looking forward to enjoy this CPL filter furthermore for better pictures.

New lens - new Breakthrough Photography filter. The raised notches on the ring allow me to easily and quickly remove this filter when seconds matter. Clear nicely multi-coated glass and 25 year unconditional guarantee that I doubt I will ever need. If you are shooting with good quality glass, this is your brand. (Expensive glass with a cheapo filter is well….silly.) Previously used high end B+W filters which are great, but I am very impressed with this brand and I like supporting a small American business.

It’s compact, affordable, and it fits in your pocket. Wished the lens tilts up and down.0

I just received these today, within the last hour or so, so this isn't a thorough field tested review. I did however take sample shots of a door with a calendar hanging on it. I used my Canon 17mm-40mm F4 lens at 17mm. I took one shot with no filter that was at about 17.5mm since I hadn't realized that I had slightly moved the zoom ring. I then corrected that error and then took a picture with the 3 stop, then 6 stop, then 10 stop.After I was finished I looked at the images on my computer. Vignette was more apparent with each increase but I was expecting that with this lens. I should mention that to mount a 95mm filter on a 77mm lens I used a step up ring by the same manufacturer.The focus and image quality did not appear to be affected, even zoomed in at 200%. One thing I observed is that I need to slightly over expose according to my light meter in the camera to keep the resulting images from being just a tad dark.After I corrected for exposure, my error, not the filters, the images were essentially identical. I the future I will use the "Long Exposure Calculator" app.As a hobbyist I am very happy with the results.

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.

I have been using this filter to protect my lens and it has done the job.