Great purchase, easy on the wallet and to use. I’m not sure if it’s a drawback or not but you can’t use your lens hood with this filter on your lens. Kinda I guess.

I had been meaning to buy a variable ND filter for my 24-70f2.8l for a while. When I heard about K&F filters; having tried a 3xnd filter kit pack that I was impressed with; especially at the price. I looked at K&F's other products and found this more than reasonable price ND filter and had to give it a go.The filter is shipped from China; so its not something to order if you are in a rush - but when it did arrive I was blown away by the quality of the presentation. The filter was packaged inside a well designed; expensive looking, cardboard outer package and then a hard plastic inner with a foam sheet to allow it some protection.On opening the pack one disadvantage to this filter immediately manifested itself; the front element isn't 77mm so your lens cap won't go back on the lens with the filter mounted. The filter mounted smoothly onto my lens. The variable darkness is achieved by rotating the front element; as you would a circular polariser. The K&F filter spun smoothly but with enough resistance to keep the darkness you set so knocking it won't change the setting. One disadvantage to the design is the filter doesn't have coded ND values so there is a bit of guesswork to get the right exposure for stills.I tried the obvious and took an image of a plain white wall at various ND settings; and there was some minor differences in the brightness of the photo - it was a bit lighter at the edges of the frames. At its darkest on long exposures; the 6d went red shift but this is correctable in Lightroom (and made much easier if you use a colour checker passport.) If you zoomed in on the plane white background you could see some variations in darkness; and ultimately pixel peeping at maximum darkness a mesh. That said taking pictures of something more interesting than a wall the effect was lost in the detail of the image.I rarely shoot video so for you dear reviewer; I shot some test video of the same white wall. I don't have any fancy video editing software and just watching the video back in lightroom; the darkening effect was pretty uniform across the photo. As with stills if there were any criticism it is very minor and that the corners show up brighter than the centre of the frame. The majority of the frame being uniformly dark. There was no patterning showing in the video.Using a standard ND filter definitely gave a more even darkness to stills but I am planning 3 long trips this year and carrying 5 ND filters everywhere felt like a chore. Now I just need one. If i could I would ding 1/2 a star for the front element size not being 77mm but its a minor inconvenience in the scheme of things.

Great ND filter for Rokinon Lens. Working as expected.

Pros:- Outstanding sharpness, saturation, and bokeh- USM AF is fast and quiet- 2 focus range settings- Fast f/2.8 throughout zoom range complements 24-70mm f/2.8L- Image Stabilizer- 2 IS modes: 1 - normal & 2 - panning- Weather sealed- Common 77mm filter among L-series- Front element does not rotate with focus- Non-existent zoom-creep (lens does not extend)- Solid construction and feel- Focus range indicator window on top of lens- Comes bundled with lens hood, tripod collar ring, and standalone lens bag- Well controlled vignettingCons:- Heavy- Expensive- Longest of the 4 Canon 70-200mm'sThoughts:Outstanding Lens! Always use a filter and use the lens hood as much as possible. The lens hood does get in the way of using a polarizing filter since the front element does not extend. Front element does not rotate when focusing. One of my more favorite lenses. It is used in conjunction to my 24-70mm f/2.8L. My 1.4x extender is only used when I want more reach, but it does cut the sharpness down a bit. I love the IS on here. The ability to change IS modes is awesome. Having 4 setting switches on the lens is a step up from the 24-70mm f/2.8L (that having none). The white finish on this lens garners a lot of onlooker attention. You'll get a ton of attention at events and need a monopod if you want to use it for a baseball game and the like. 24-70mm f/2.8L seems light after wielding this lens. This lens attached to a 40D will not fit the Lowepro Slingshot 200 in the quick draw position. That said, I never use the included standalone lens bag (it looks more like a tan & black lens holster; comes with a thin black shoulder strap). It's best to get this on sale (Christmas season comes to mind). The $1700~ price tag is steep, but the $200~ in instant rebate is nice.Bottom line:Outstanding Lens! Highly regarded and recommended.

I don’t claim to be a professional photographer or even an able enthusiastic, but I have noticed this ND Filter improving my snaps. This filter is supposed to reduce the light coming into the lens of your camera thus allowing you to increase the exposure time. Now, my pictures have a more polished feel while offering a sense of life. But ultimately, unless my skill levels improve, this lens filter will probably be overkill for me. Well, at least for now.A high-quality piece of accessory that is aimed at the pros. It even has its own shock-proof case.

I am one of those photographers who keeps a circular polarising filter on my lenses full time. Recently I purchased a Urth Gobe 67mm for my 70-300mm F4L lens. Although this is a heavy zoom lens, I find that I can handhold it to produce photomerge panoramas. I wanted to see the effect I could obtain / create with a Variable ND filter. One word, OUTSTANDING. I was so impressed that I recently purchased a 77mm Urth Variable ND filter for my 20-105 lens. Haven't tried this one out yet but I am confident it will produce excellent results.The filters come in metal containers, the glass appears to be without any blemish or flaws.Delivery was as promised, so happy customer.

Bought this to use on my Sigma 150-600 where it has performed well. I bought a Canon RF 800mm F11 recently and all my other 95mm UV filters have frames that are too big for the lens hood to be used and I really want to have a UV filter on this lens to protect the front element. I noticed how slim the frame is on this filter so tried it on the Canon 800 and it allows me to attach and remove the lens hood with the filter in place. Perfect. Optical quality is great. Can't see any performance issues compared with my Hoya, Kenro or Marumi filters. This seems every bit as good. It's the only UV filter I've found that has a frame small enough to be able to use the lens hood when the filter is fitted so for anyone with the Canon RF 800 this is a no brainer.

This ND filter has its uses for example blurring the movement of waterfalls without over exposing the rest of the shot. Unfortunately for my use it is not dark enough. As I am just starting with experimenting with long shutter times I thought the range of this filter would be fine but I didn't really appreciate how long my shutter would have to be open for the light conditions I have and the effect I want. I really need a ND1000 (10 stops). That's not to say there is anything wrong with this ND filter it works fine is well built comes with a storage box to keep it well protected with an included cleaning cloth. I should have just read up a bit more before getting this as it's not dark enough for me.Something else to think about I couldn't get the lens hood on the lens after this was fitted.