UV filter is probably the most popular type of lens filter, in which many photographers use to protect the front element of an expensive lens. Unfortunately, there is a huge range in the quality of UV filters. I wanted to keep a functioning together to test UV filters, and other filters, more accurately. Today, I will perform those tests on K & F concept Nano-X 67 mm UV filter.
Introduction to K & F Concept Nano-X UV Filter
The K&F concept nano-X UV filter is a thin UV filter with some types of 28-layer “titanium coating” feature, which is considered to furore and maintain sharp. When I was testing it, I certainly did not notice the loss of sharpness with my eyes without my eyes.
This filter comes with a non-slip rubber holder in a good case. This design also fits the small filter safely, and the rubber holder prevents the filter from all around and scares the rare owl. If I ever find a rare owl, it will work.
Color accuracy
The first and most noticeable problem with some filters is a warming or cooling effect. I test it using a relatively constant lighting source on one Calibrite color passport targetChecking with filters in several tests and checking without white balance settings. From these tests, 95% confidence interval for temperature and tint modification can be generated:
The way to interpret these graphs is: the color temperature change was just on the edge of the statistically important, and the average change had a cooling effect of about 24 Calvin. Originally in the real world, you will not pay much attention to much change, and any slight change will be easily correct. not bad! For tint, the change was effectively zero.
But we have to dig a little deeply. Even if a filter changes the white balance slightly, correcting it can still cause color inaccurate in individual color channels, even if the white ton is cured back in white color. (It is particularly prevalent in JPEGS, but if it is sufficient then it can also appear in raw files.)
Therefore, for the next color accuracy test, I measured the deformation of RGB and CMY colors in HSL scale degrees, as well as on two skin tone axes. This test is slightly affected by the used lens. In this case, I tested it with Nikon 50mm f/1.4 Z, a lens that I have found that there is minimal color inaccurate.
Then, these times represent 95% of the differences of differences between bare lenses and filters. This is good if zero, bad otherwise occurs in bars, and the strength of the effect is represented by numbers. The units are in degrees, and usually if the effect is less than 0.5, it will be noticeable.
Since all times are zero in the bar, besides with very small effects, this filter color is much more correct for protection. Even deformation in the first skin tone is below the threshold of being photographed by a problem.
Furious and opposite
All filters interfere with the light coming in the lens, and this is the just question of how much.
Unfortunately, it is comparable and meaningful in all situations that it is very difficult to come up with the measurement of provoking. This is because each light position will be different, and each lens is also prone to different types of flames that can increase even more by filters. Nevertheless, I can say that in different situations, I had to flare to be well controlled with this filter. In the testing of a worst position, with the lens already provoking, I compared to the contrast and after adding the filter and after comparison to the first and after. Here are side-by-side images that are showing visual differences:
This is not very noticeable, but if you look closely in the right corner below, there is little effect from where the light source was coming. And here is the confidence interval of the difference between the lightest lower class and the darkness:
Therefore, the HSL scale had a meaningful loss of contrast with a small effect of approximately 3.2 luminosity units. Therefore, in the worst situations, such as a little off-axis light-like sunlight exploding in your lens, removing the filter will improve your opposite.
Finally, I measured vignating, which was no one at 50 mm, although I did not have a broad focal length to measure.
conclusion
Overall, K&F Concept Nano-X UV Filter performed well in my tests. It has excellent color accuracy, there is no meaningful loss in image quality, and in the more severe backlit conditions, there is only a slight decrease. It is also a well -made and durable filter that comes in a good case. Especially given the low price, it is an easy filter to recommend. (Prices range from $ 32 to $ 53, depending on the size you have.)
If you are interested in this filter, consider buying it through one of our affiliated links, which we do in photography life, support that harsh test! And be sure to choose the right filter size to match your lens:
My biggest problem with this filter is that it has been ordered in most sizes. If you do not want to wait for your arrival, you may want to check the Amazon or Adorma to see if they have the size you need in stock:
I hope you enjoy this review! I am eager to test more filters soon, including some new test methods that I am developing. How are you? Do you want to see more such filter reviews or scientific comparisons? Feel free to tell me what you want to do more!
