I am satisfied with the ND Variable filter. It has allowed me to take very good quality photos.

Price-performance ratio. Doesn't have a dark "x" like other variable ND filters. Picture quality is also very good. Would recommend 100%. At this price you can't go wrong.

I have now also bought the 72mm version in the Lightning Deal and am equally satisfied with it. I now use the variable ND filters as “fast” filters for on the go. If I would like to expose even more professionally, I use my K&F Square Filters. These are also highly recommended!
The 72mm round filter shows similar good characteristics as its big 77mm brother. It has light colour engravings in the maximum range, but impresses with its consistently good image quality and workmanship.
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The filter is very high-quality and comes with an extra sleeve. The filter is made of metal and glass. The two rings can be rotated against each other very smoothly.

For me the variable ND function works very well. Both discs are perfectly matched. I could not see any loss in image quality on my test images. The construction automatically results in a vignetting and sometimes a colour cast is created. However, nothing you could not quickly calculate with an image editing software!

One of the better variable ND filters I've used. The build is extremely good for the price. I really like that it is a slim build and doesn't make your setup overly clunky.

It's better than some really cheap variable ND filters I got a few years ago.

Value for money. Doesn't have a dark "x" like other variable ND filters. Picture quality is also very good. Would recommend 100%. You can't go wrong with this price.

I have come to rely on K&F Concept for a number of filter types for my many lenses. They are well made with quality glass and I have yet to find any real faults or negatives in these great value filters. You would have to pay a TON more for filters that are only slightly better than these!

This variable ND3 to ND1000 filter provides highly capable ND correction from 1.5 to 10 f/stops. It is a 67 mm filter that is widely used...especially for the majority of Tamron lenses as well as a plethora of Sigma, Sony and Canons as well, which makes this filter an even better bargain.

The variable range is done simply by rotating the front dial of the filter until just the right ND level is found in the viewfinder. The filter features 24 multi-layer coatings to provide the clearest and distortion-free optics, using Japanese glass (Excellent) and precise CNC machining.

I can honestly say that this variable ND filter is almost as good as filters that cost as much as five times more. Construction is very good and the filters mount to appropriate lenses without drag, rubbing or other issues. Simple operation and fantastic results!

All in all, and especially at the value price, this set earns an easy FIVE STARS with me, and I can honestly and heartily recommend the set for your appropriate lenses.

It's a must have in your camera bag and at a fraction of the cost of other brands of variable ND filters.