Box contents:

- filter holder for 100 mm x 100 mm filter
- adapter ring 67 mm
- adapter ring 72 mm
- adapter ring 77 mm
- 82 mm adapter ring
- padded cardboard box for filter holder

The whole thing makes a very valuable impression overall.
The adapter rings are black anodized aluminum - they are well made, not sharp and the thread can be easily screwed onto the lenses.
In addition to the plastic filter cartridges, the filter holder is also made of black anodized aluminum. Here too, the treatment is excellent. Maybe the quality of the plastic inserts could be better, but this is already complaining at the highest level. The inserts fit all 100mm x 100mm filters with a thickness of 1mm to 2mm.
the packaging was impeccable; Adapters are individually packaged; The portafilter comes in a nice padded cardboard box.
Full points and recommendation for a perfect rectangular filter system at a significantly lower price than some other manufacturers.

Came in quality packaging. Adapter rings were in individual bags but don’t see that as a drawback.

Hoping the glass is a better choice than resins that scratch...will just need to be careful not to drop them.

Needed a 10 stop Nd filter for long exposure and decided after reading reviews to buy this bundle instead of buying a smaller cokin p size to go with and older format Hi-Tech system I have. So glad I did.

I LOVE how easy this is to attach to the lens. I need to take more shots...but so far I am not getting any color cast. I shoot raw anyway so it isn’t a deal breaker. I LOVE the glass. Because the set screw was a bit fussy on my Hi-Tech holder, I opted most times not to carry it with me. I would rather fuss with composition and camera settings than fuss with a filter holder. This one will be in my bag from now on for sure. It’s simple to set up in the field.

Update 10/12/19. Put this set thru it’s paces on a photo shoot in Hawaii. Professional photographer was impressed with the 10 stop glass. No color cast. Easy to use. Got the 6 stop and 10 stop glass. Highly recommend both. I just need to get a 3stop to complete my set.

For safe storage of three square filters 100 x 100 mm and a filter holder. The case seems sturdy and looks pretty good.

The holder is fine, would be nice if it had 3 filter slots. The 10 stop is great! The filter bag is also very nice.

I've used it once and I paired it with a 10 stop ND filter with this and I was able to set my camera set at 30 seconds, f11 and ISO 50 in the middle of the day but with the 10 stop I could only get it to 10 seconds, f11, ISO 50. I was surprised to see that when I got home to edit the photos there was no noticeable loss in sharpness with both ND filters on and this being a variable ND filter they're notoriously known to be less sharp than a constant ND filter. I can't wait to test this out on a waterfall but being that it's summer in San Diego right now I'll have to wait to try it out but along the coast I prefer the 10 stop ND filter and being able to drag that shutter longer. The front of this variable ND filter is quite large so your lens hood won't fit on there which can be an issue with unwanted lens flares but the K&F 10 stop ND filter I used with this you're able to mount the lens hood still. I received this filter free of charge to test it out so take my review with a grain of salt but if you do choose to get this I highly recommend getting a 10 stop as well because you'll be limited to 2-3 second shutter speeds with this alone at it's darkest setting in the middle of the day where the sun is bright like it is here in Southern California. I forgot to mention that there are notches on the side and tells you the minimum - maximum darkness and each stop between so there isn't any guess work involved but I do like the fact that I was able to set my settings I wanted and just rotated the front element until my camera read that I was properly exposed.

I'm not ready to purchase an expensive 10 stop ND 100mm filter system yet. So I want to try this one out. The picture quality is solid for the money. Pic 1 (no filter), Pic 2(this product), Pic 3(K&F 40-1, 10 stop ND). Obviously, this is a big step up from plastic one (pic 3). In pic4, the pin holding the filter holder hinge was so loose. If you lose the pin, the filter holder become useless. The pin fell off when I first open the box. I didn't realize that until I tried to put the filter holder on my z6. Therefore, I decided to blue tape it to prevent the pin from falling out. I think it is a good buy if you are a amateur photographer.

This is tough to beat. Not only do you get a 100mm GLASS (not plastic) 10-stop ND filter, but you also get the filter METAL mount and multiple METAL lens adapters. Even if you need to buy step-up/down adapters because the ones included do not fit your lenses, this is still a bargain. Even though this comes in at well below the price of other 100mm 10-stop filters (without the mounting system), it performs excellently.

My unit doesn't produce any noticeable color cast, but I also shoot solely in RAW, so a color cast wouldn't be an issue anyway. The case for the filter is firm, so I don't worry about it very much when it's in my camera back, and the soft lining keeps the filter safe from scratches (so long as nothing coarse gets inside, of course). Better still, the filter mount features a second slot should you wish to use additional 100mm filters (e.g. graduated filters). I point out the size because this is the "standard" in these filters, rather than the more common 80-something mm ones you see in comparably-priced square ND filter bundles that use smaller, cheaper plastic filters instead.

The only issue I found, and this is really just nitpicking at this point, is that the filter mount never really feels very securely attached to the lens. The filter and mount won't fall off if the camera is moved or tilted forward, but the mechanism that attaches the mount to the lens adapter could be a bit tighter fitting in my opinion. Nevertheless, great product at a great price. Anything "better" will be considerably more expensive, and even then, how much "better" will it be?

This filter can compete against the biggest brands in the business. It has exceptional optical clarity and is a true 10 stop ND filter. I use this filter for long exposure shots, particularly nature shots with running water. However, there are many uses.

The overall build feels like quality throughout. This series from K&F knocks it out of the park and is a bargain for the level of quality. Easy to recommend.