A long time ago I started looking for filters for my Canon camera which I now have with a 77mm Sigma 17-50 lens. And since I'm not a pro or anything like that, spending some money on filters and then giving them a more recreational use gave me one thing. So I started looking at 77mm filters cheaper and buying these.
In the box you have three filters, a purse to carry these filters without being filled with dust and a brush to clean them.
Filter:
The first is an ND 4 filter, typically used for longer exposure photos. In the use I've given it has given me good image quality with no rare tint too obvious. Nothing that can't be easily corrected with a little color retouching.
The second is a polarizing filter, the intensity of which varies by rotating the filter itself. This is mainly used outdoors to remove unwanted reflections or increase the contrast of landscapes. In this case it's quite dark, so you can also run the times of the ND filter. Here we already find a little more vignetting than in the previous filter, perhaps because this is variable instead of being a fixed filter as in the previous case.
The third is the typical ultraviolet filter, which is usually recommended more than anything else to avoid rubbing a lens, which costs a lot more than the filter itself. The pocket: okay,
it
's just functional and corresponds to what it serves. The 77mm filters I bought in my case fit easily and are great.
Brush:
A little like a little like a little, it's functional. You have two endings. One end has a silky finish and the other end is more of a regular brush with hair.

In conclusion, if you don't want to spend a lot of money on filters these will help you save and you'll have three pretty good value than what other brands would cost for just one.

I did not buy this filter, I bought a size 77mm and for the price I am happy with it.

Just got a new lens, needed a 77mm filter to protect it. I'm not going to sit and tell you this glass is better than some other glass. I just got it, and I'm not an optics expert.
But, I will tell you the packaging was beautiful, the filter case- one of the nicest I've ever seen. It is circular- and holds multiple size filters with grooves in an internal bracket. So much nicer than the big clunky square filter boxes I've got from other brands.
But- the killer was the filter being so thin- and that it has 2 areas that are gnarled, for you to grab it- while the rest is smooth- a really nice feature.
Seems right at home on my Canon RF24-105/4 L IS USM.
Didn't notice any difference in speed of focus- or aberration- but, again- I'm not a lab.
I'm pretty happy with this brand. Didn't expect to be.

always buy the 77mm diameter filters for my largest lens. I have 2 lenses with a diameter of 58mm and so I can save myself the "keeping in front of it" and can easily attach my 77mm with the adapter.

I only got these for the lens caps... I don't use the Keepers and already have an awkwardly sized bag full of new microfiber cloths as they seem to come with almost everything these days.

BUT since I have many lenses with smaller filter ring diameters that I size down to 77mm by using step-up rings so they share a common filter size, I often run into shooting with an unprotected 77mm filter on the end of mine rigs around.

This is exactly the quality you would want from them. Nothing fancy but perfectly functional and easy to use/operate with one hand without looking. The set of three is useful because I need at least that many and will definitely lose them over time in the black holes that are my pockets.

No complaints!

You can get an adapter ring for just under €5, in my case from 58mm to 77mm. This is made of metal, can be easily screwed onto the lens and the larger filters can also be easily attached. So I give it full marks here.

77mm polarizing filter adapted to a smaller 67mm lens. Fits :)

Rated 77mm Magnet Lens Filter Set
The lens filters come in a nice little pouch.

The magnetic adapter ring idea is pretty clever. Simply attach the ring and put the filters on.

As far as I can tell, I think the filters are of very good quality and also properly processed.