K&F Concept 77mm Variable ND Lens Filter ND2-ND400 (1-9 Stops) 18 Multi-Layer Coatings Adjustable Neutral Density Ultra Slim Lens Filter for Camera Lens (K-Series)

You can just feel the quality of the lens from the touch. Looks great and seems versatile. I definitely recommend it rather than buying a bunch of ND filters and having to carry them. Also, K&F Concepts seems on the cutting edge and they have great prices for great quality. Don't hesitate to purchase!

High quality and optically superior to other brands. Perfeyfor shooting video on nright sunny days!

This filter adds a significant X artifact on high stops, which are likely to be the preferred stops.-- Edited 02/23/25The seller has contacted me with a technical explanation for this artifact and why it occurs at the highest values of ND.While this doesn't change the fact that this item is sold and doesn't provide the expected service, I'm moving the rating to 4 to acknowledge the quality of the seller's customer service.

Every photographer should have a couple of these in their camera bag. Preferably one for each of your lenses. These are affordable with great quality glass.

This is freaking awesome. Keeps unwanted glare out of pics, great for those bright outdoor shoots. Bright scenes are easier to manage.

Great ND filter. Variable and great picture quality.

Very solid variable ND, especially considering the price.

This filter is, to be fair, solidly built and a pretty decent performer for a low price. It's allowed me to get some long exposure shots that I wouldn't have otherwise captured, so that's cool. All that being said-The image quality of this filter falls of sharply the closer you get to the max ND setting. The more ND effect is applied, the more you start to see dark bands in the corners and sides of the image. These are difficult to correct for in post production. It's not very noticeable in a busy scene, like in a forest, but is VERY apparent when against the sky. Like, almost unusably bad. So consider carefully what you're going to be shooting with this filter. If you just want something to darken a flash a bit or to take long exposures of waterfalls deep in the woods, it works great. Especially at the more moderate ND settings.If you're a landscape photographer though and the sky is often featured in your photos, this is not the filter you want. Getting a useable image at high ND settings in this scenario requires a lot cropping and manual corrections that still don't look quite right. Pony up for a spendier filter in this case, there's no way around it.This thing also changes the outer thread diameter when it's installed, so your lens's cap won't fit any more as long as it's attached.