Good ND Filter for the 18-135mm Sony E-Mount Lens

Great Variable ND Filter for the price

Versatile and easy to adjust to ambient light.

I shoot a lot of video with different lenses, and lately have been using my 24 f1.4 Sony lens quite a bit while outdoors, and this can be a very bright lens, so using a variable ND filter like this one by K&F can definitely be useful and a big help to shoot with low apertures and further blur out my backgrounds nicely. I didn't notice any real color shifting, and my image has remained sharp as expected. I like that this one is so variable and allows me to use just this one filter, rather than having to keep changing them out to different ones and the light changes. It's just more useful. I'm thankful this one came with that little plastic storage case, rather than a pouch or something useless, because it helps me to protect the filter when not in use. This is a nice inexpensive alternative to much more expensive ND filters and it's actually quite nicely made.

For the price of one I now have a well made variable ND filter for all my lenses - I am very pleased!

Since I discovered photography as a new hobby, I was looking for different filters. With this ND filter, you can turn day into night and thus make long exposures during the day and at dusk. Through the manual settings of the filter, msn can adjust this to the appropriate surroundings and lighting conditions. Magnetic Variable ND Filter, the installation is very fast, you won't miss a moment I totally recommend this filter.

I tested the variable gray filter from K&F on a Tamron 28-200mm F/2.8-5.6 DI III RXD lens and a Sony SEL-20F18G, on a neutral white background.
Since I already use fixed ND filters from K&F and am quite satisfied with them, I was curious how this variable filter would perform.

Advantages of the variable gray filter from K&F:
- Significantly less expensive than purchasing multiple fixed density filters.
- Takes up less space and weight.
- When filming, among other things, smooth aperture transitions can be realized without post-processing.
- Pleasant feel.
- Handle for adjusting very well solved.

My conclusion: The filter from K&F achieves good results especially at low stops between 1.5 and 4 f-stops. Beyond that, however, the uneven light distribution at the edges of the image increases. This becomes more noticeable the shorter (e.g. at 20mm) the focal length is. At 10 f-stops, the X-effect then also becomes visible. The color fidelity is not really neutral and has a slight yellow cast, but can be easily corrected afterwards via the white balance in RAW images. An assessment of the set density via the scale on the filter is only roughly possible, which makes it almost impossible to calculate the exposure times manually. However, modern cameras like the Sony a7 series can reliably calculate the exposure time through the filter. To be fair, it must also be said that the aforementioned weaknesses occur to a greater or lesser extent with every variable gray filter. Therefore, my recommendation for ambitious photographers is to rather rely on ND filters with fixed density. In the range of 1.5 to 4 f-stops, however, the variable filter from K&F is quite usable for qualitatively good photo shots. Especially for filmmakers, the K&F should be an attractive filter, at a reasonable price. In my opinion, the disadvantages are less important here. The processing is successful in every respect. The filter can be operated well, without accidentally touching the glasses with your fingers.

I received this variable ND filter today and immediately took photos with my Sony A7 III and the 24-105mm f/4.0 lens. I exposed manually and deactivated the live view display. The results were VERY convincing. This combination will soon also be used for video filming.

I had had very bad experiences with another variable filter a few years ago because it created colored streaks in the photos, so I had to return it.