This is a nice quality filter from a well-respected brand.
Secure and clean in its storage box it is well made and looks very smart.
It screws to a standard Canon 58mm lens smoothly and easily and caused no issues with auto focus of the lens.
I have included two photos to show the difference using this filter makes and it is a really nice effect.
Great quality and value filter.

At a historic moment in which post-editing is becoming increasingly “accepted”, it's nice to see that there are still products that allow you to take creative shots as you used to do.
Specifically, this Star Filter by the always prolific K&F Concept allows you to play with light diffraction effects and create classic “spikes” in the dot lights of the background. In this specific case, this filter allows you to create 6 spikes per light, and it does it very well. The diffraction lines are very clear and beautiful to look at, and the neutral part of the filter, of excellent quality, does not degrade the quality of the final image.
The construction is, as always happens in the K&F house, really excellent, the metal part is perfect and the thread flows without any problem.
In addition to the filter box, there are also 3 sealed pieces for cleaning.
For those looking for this effect I definitely recommend it!

An excellent quality filter. The threads mated smoothly on my lens, and the filter was rotatable to adjust the position of the stars. The short-line stars were perfect for Christmas pictures. See the example photo taken of a small Christmas tree at f11 zoomed to 110mm for a 10-second shutter speed.

This K&F CONCEPT effect filter allows you to create stars on the light spots in the frame.
The principle is based on a network of very fine perpendicular stripes on the surface of the glass.
Once mounted on the lens, or even on a smartphone, the effect on small points of light is immediate, we have 4-pointed stars, forming a perpendicular cross.

Ordered in 77mm diameter, this filter does the job.
I would have just liked to have a label on the box to identify the filter that is there.

The K&F Concept Starburst 4 point filter came in a simple plastic case packed in a cardboard box and included 3 individually wrapped cleaning cloths.

The workmanship seems good to me. The filter is easy to screw onto lenses with a suitable thread diameter. For me, for example, on a Sony FE 135mm F1.8 GM.

Of course, you should always keep in mind that every piece of glass that you mount in front of high-quality lenses always worsens the image quality more or less - here the quality of the filter seems absolutely okay and has no noticeable deterioration during previous use. And no disadvantage compared to old-fashioned brand filters from Hoya, which I've been using for years.

A starburst filter ensures that light sources or particularly smaller points of light receive “star shaped” rays on the photos. This filter can also be adjusted by turning the front element so that you can slightly change the direction of the rays.
A very nice effect, an interesting addition to my equipment, especially during Advent/Christmas time. This allows me to diversify my people and portrait photography with lights in the background (e.g. in the evening at the Christmas market or street photos). It can also be used in many other ways.

By the way, there are also different variants, such as starburst 6-point filters, i.e. only 6 light rays instead of 4 in the “star” shaped lights.

Conclusion:
Anyone who likes to experiment with real filters and wants to create their photos completely in the camera as far as possible instead of doing everything in post-processing will find an interesting addition to their equipment... for me so far, a filter that fulfills its purpose, which also seems flawlessly processed to me.
So far I'm satisfied.
For subjects without strong, individual lights, you shouldn't expect any noticeable effects here.

After my first attempts with the 4-beam star filter from K&F Concept, which I tested first, I was a bit uncertain as to whether I would give this filter the full five stars. Unfortunately, as far as my taste is concerned, this filter does not work against a beautiful multi-beam dazzle. In addition, the filter creates a certain aura with every light source, as is known from crap filters. The filter for 6-ray stars tested here shows the stars a good deal better in direct comparison, the crap effect is obvious here too, it remains a compromise.

The truth is, of course, that you only get a beautiful aperture star with most lenses when the aperture is significantly closed. It is not always possible and not always wanted. With this filter, if all other parameters are correct, you get an aperture star even openly. To do this, the light source must be bright and as small as possible. Unlike the rays that my aperture produces, the rays are significantly wider here. It was also remarkable that the rays are shorter with the 6-way filter than with the 4-way filter at the same setting. Perhaps a very interesting fact that the effect appears to be more concentrated due to fewer rays.

Remarkably, you don't see a prism effect here, which fans out the rays in a colorful way like a rainbow. The light color of the light source is retained very well. I think that's great and has already bothered me a lot about other star filters. After the thread and filter glass are rotatably connected, the beams can be oriented as required.

As usual with K&F filters, the workmanship is absolutely convincing. The thread runs easily when screwed onto the lens and the glass rotates easily but not too easily. The filter comes in a practical plastic box and three of the well-known welded K&F cleaning cloths are also included.
Given the fairly fair price, this is a nice solution for anyone looking for exactly this effect

My rating: 5 stars — perfect product, or at least almost

transparency: I received this item free of charge for a product test. However, that doesn't affect my rating. This is done just as honestly and critically as with the articles I paid for. I have not carried out a professional product test here, but am evaluating the product as a normal consumer.

Photographic filter that allows the creation of characteristic star-shaped lights giving a very Christmas effect.
The filter is made of quality glass and the insert in my Tamron 24-70 2.8 is perfect, there is no play, movement or noise that is worth noting.
The effect created is very nice, beautiful for making the lights blurry in the background in Christmas portraits or Christmas-themed family photos.
I recommend using it at the medium aperture of the diaphragm to have the best possible effect with well-defined stars or at full aperture if you want a very accentuated bokeh effect.
The glass is really of excellent quality, it does not create problems of definition or haze, nor of color variance, it also acts as a protection for the main lens, highly recommended

I'm becoming a fan of K&F Concept's photography accessories. I've gotten several of their products, and I've been pleasantly surprised every time. Thus far, their products have always been far better than I'd expect for the price. This star effect lens is no exception.

For under $25, you get a very nice effects lens, a very nice hard case for the lens, and three of K&F Concept's amazing microfiber lens cleaning cloths. The lens itself is well built, looks the same as any lens you'd find in an expensive photography shop. The lens is sent in a hard plastic case, with custom cut foam holding the lens nice and tight.

Using the lens is pretty basic; just screw it onto your camera's lens (make sure you know the size of your lens, so you can order the correct size for your needs). And you're ready to take some cool photos. Be prepared to pick your subjects while keeping both contrast and lighting in mind. The lens works best when photographing bright, pinpoint light sources in high contrast settings. Otherwise, you might find it a bit difficult to see any effect from this lens, especially in bright daylight situations. But this effects lens excels in low light and night photography (see photos). If you don't like the direction of the "stars", simply twist the adjustment ring on the lens. You can thoroughly adjust the stars' direction to whatever angle you wish. As you can see in the photos, there is no color distortion or change. You just get stunning nighttime photos.

I'm really quite pleased with my first session using this new effects lens, and look forward to using it again very soon!

The K&F Concept Starburst 6 point filter came in a simple plastic case packed in a cardboard box and included 3 individually wrapped cleaning cloths.

The workmanship seems good to me. The filter is easy to screw onto lenses with a suitable thread diameter. For me, for example, on a Canon RF 85mm f2.0.

Of course, you should always keep in mind that every piece of glass that you mount in front of high-quality lenses always worsens the image quality more or less - here the quality of the filter seems absolutely okay and has no noticeable deterioration during previous use. And no disadvantage compared to old-fashioned brand filters from Hoya, which I've been using for years.

A starburst filter ensures that light sources or particularly smaller points of light receive “star shaped” rays on the photos. This filter can also be adjusted by turning the front element so that you can slightly change the direction of the rays.
A very nice effect, an interesting addition to my equipment, especially during Advent/Christmas time. This allows me to diversify my people and portrait photography with lights in the background (e.g. in the evening at the Christmas market or street photos). It is also safe to be used in many other ways.

By the way, there are also different variants, such as starburst 4 point filters, i.e. only 4 light rays instead of 6 in the “star” shaped lights.

Conclusion:
Anyone who likes to experiment with real filters and wants to create their photos completely in the camera as far as possible instead of doing everything in post-processing will find an interesting addition to their equipment... for me so far, a filter that fulfills its purpose, which also seems flawlessly processed to me. So far I'm satisfied.
For subjects without strong, individual lights, you shouldn't expect any noticeable effects here.

The sample photo with/without filter was taken with an 85mm f2 RF lens at f2.0, with an LED flashlight at a lower level as the light source.