Great product and does what it's supposed to. When shooting with an A7rii and a Tamron 28-75mm G2 there seems to be a bit of vignetting (possibly due to my settings, it may also be an aberration other than vignetting). The variable ND is definitely nice to have and the range is good for most applications. I found it particularly useful in a snowy environment where I wanted to keep the ISO low.

A few criticisms I have that may be unsolvable because 9f is the nature of the article: 1) the lens cap just barely hangs on this filter, possibly a Tamron lens issue, 2) a lens hood not working effectively, the V-ND's bore makes it so that you would THEN put the filter on the cover.

Trying to capture a long exposure photo at sunset or sunrise with a standard ND filter can be challenging. However, this filter allowed me to easily adapt to the changing light conditions and keep my shutter speeds where I wanted them to ensure I could capture the car light trails in their entirety. The filter does not produce a color cast, which is excellent for a filter in this price range. The K&F team has a winner with this filter.

I just had the opportunity to try out my new filter last Saturday. Not only was I happy using it with my Nikon D5200 and 62mm Sigma lens, I also held it hand-held in front of my Sony HX90V's lens while capturing a sunset over the Oquirrah Mountains. Wow! The filter worked well on both cameras! No distortion at all. Love it!

If you are taking photos (or especially videos) outdoors in sunlight, you NEED a variable ND filter.

When shooting at 30fps video, you need to keep your shutter speed at 1/60 (because of the 180 rule) to get natural blur and smoothness. If you want a nice blurred background at f/2.8, even at ISO 100 there's a big chance your image will be horribly exposed. Your only options are to increase the shutter speed (and spoil the natural look with annoying "choppyness") or crank it up to f/16, which will flatten your image and get rid of that blurry background you want!

In addition, there is the variable ND filter. When applied like variable sunglasses, it allows for the amount of light to let through, much like an intimidating bouncer at a nightclub. So just turn the ring on the filter and you can get your shot perfectly!

There were two small things that annoyed me about this particular filter
: 1. The ring has no actual stops, just continuous rotation, so you can't really keep track of the specific amount of light you're letting in.
The filter on my Tamron 28-75 2.8 lens, I cannot put on the lens cap at the same time. Not a deal breaker, but annoying when you want to quickly snap a photo or shoot a video.

But for the price, it's hard to argue that this isn't a great buy.

This is the first time I've used a variable ND filter, so I was a bit skeptical.

I thought this would result in uneven lighting in my image, but to my amazement it is not. I actually have a really cool little product, not sure how it works, but as you rotate the filter the lens gets darker or lighter accordingly and is very consistent all the way.

Didn't notice any color cast or image quality issues. I actually ordered a second one for a different lens I film with.

I only used this filter on video, no stills, so I didn't crop to see if the sharpness decreased, but I didn't notice any decrease in video quality. would buy again.

Until you take it to ND 350 O 400 it doesn't make the effect of X so it's very wearable at a very affordable price, it has a slightly warm color temperature throughout the image.

For this price you can't do much better! There is some X artefacting at the darkest setting, but otherwise this is a fantastic value for a variable ND. Using this on my Sigma 16mm on an a6400

I love this product! Works perfectly! I don't need to try high priced VND filters so I'm not sure how it compares to Peter McKinnon VND or similar. For $20, I get my bang for the buck. I have already ordered a 2nd as I am running 2 cameras arriving today. I'll probably do an unboxing video for this next one.

UPDATE: I was approached by a company rep and offered a replacement filter. I received it today and did a quick test. This filter seems to be much better. There are no corner shadows or black spots when shooting towards a light source. Haven't tried it in the field yet, but looks like it will be ok. Either way, impressive customer service.

ORIGINAL: After reading all the reviews, I decided to buy this filter because my budget was tight. I used it with a 24-105 f/4 L lens to take some sunrise and sunset photos. It's absolutely awful. On the right side of the filter is a black shadow that gets stronger with each step. I wish I could return the filter but I already threw away the packaging :( Have to throw away this filter as it is totally unusable...

Good ND filter and no vignetting