I think the 1-star reviewers here should ask for a replacement.

I am using these filters on a Sony Alpha A5000 and man - they're fantastic. My original intention was to get some cheap filters to put on a decent camera and maybe get my boyfriend interested in photography. I figured the UV filter would keep dust off the lens and didn't expect much from the polarizer.

Most of the time I have been using just the UV or the UV + The Polarizer.

I stack them, the UV never comes off the lens.

Both filters can be removed freely when I want to, and zero of my photos so far have shown lens flare. A few have shown double images but I'll explain that in a moment.

One thing you have to understand is that a polarizer fights your camera's autofocus. It darkens the image, and it would seem that the act of polarizing the light makes the camera think things are in focus when they are not. I've seen this on lots of fairly nice Nikon and Sony cameras (never used a Canon, I assume it'll be the same there).

When your camera autofocuses poorly, you get a double image. That's all there is to it.

You should adjust your viewfinder's diopter if you're seeing a clear image but it's fuzzy when you snap it. You should also be paying attention to your focus indicator because usually your camera knows when something is wrong with the focus.

I attached two pictures - both with UV filter and polarizer stacked. One of a seeding salsify and one of text. Both shot at F/9

The Salsify is shot at ISO 200 outside

The text is shot at ISO 1600 inside

Both clear and crisp because I didn't point and shoot - I took the time to get a good shot. Bad optics are bad - but it is the responsibility of the photographer to get good results - be that exchanging a defective filter or spending some time to figure out why your camera is struggling to capture a sharp image.

Less than fifteen bucks got me a set of filters that work as described - and make a nice addition to any camera - mirrorless or DSLR.

These are great quality lens filters!

They aren't on par with a tiffen lens filter but they are a fraction the price and do almost as good a job!

The polarizing filter gets the most use from me and I leave the UV filter on all the time to protect my lens.
Neutral Density filter I have only used a couple times and it has worked well each time, not sure its actually ND4 but its close enough.

I use these on Sony A6300 and A6500 cameras with stock lenses! and they screw right on without issue.

Give them a try, at the very least its worth it to protect your expensive lens!

I bought these filters for my Nikon AF-P DX NIKKOR 10-20mm f/4.5-5.6G VR F/4.5-29 Fixed Zoom Camera Lens, Black and they work like a charm. I use the Neutral Density ND4 filter for slowing down my camera and achieving that silky smooth look for waterfalls while maintaining a wider aperture. The carrying case is an added bonus. Just throw this puppy in your camera bag and go.

I've always had amazing experiences with Altura products but this filter set wasn't too great. I gave myself a blister trying to remove it from my Sony 55-210 and by no means do I ever tighten my filters close to tight. The CPL ended up breaking and after multiple minutes in the freezer I was finally able to remove the filter thread on my lens. I scratched my lens housing also. It seems that the ND and the UV filters are not made of metal but rather plastic, and or it might just be a matte finish on the metal. Love all of your other stuff Altura, but please revamp the quality of the threads and rings!

Using on a Nikon D5500 for my zoom lens 70-300mm AF

I used this mainly to photoshoot during the day time to have those UV rays brush off from my angles and shoots. The contrast alone has been solid for my pics and the colors are more saturated when I would use the Polarizer. I hardly used the ND4 since I didn't do much for long exposure and if I did used it, i probably thought it was the Polarizer. I used the regular UV filter mainly as a lens protector and all it has done for me was collect dust or creating light ghosting.

PROs:
- Colors are contrast
- Reflects light away most of the time
- Protects your lenses glass
- Less work on you when adjusting your exposure and other settings when needing to take a shot during broad daylight.

CONs:
- Threading it on can be sometimes an issue, just do it slowly.
- At night, sometimes its not good to use the UV Filter, it will reflect light onto your pics and you would have a ghosting effect.
- Sometimes hard to spin off from the thread of your lens.

SUMMING UP:
Overall this is a good performer and added bonus that it came with a ND4 filter in case you plan to do a long exposure. My images turn out correctly colored and I wouldn't have to keep adjusting my F stop to it's highest 22+ and having my ISO to 100 wasn't enough to cut light into the shot so, I think the Polarizer has helped me a lot more during broad day light shoots.