The K&F Concept Magnetic Variable ND Filter offers a convenient way to control light for smartphone photography. While it has some strengths, it also comes with a few limitations.

Key Features:

Magnetic Convenience: The magnetic attachment system makes it quick and easy to apply and remove the filter.
Variable ND Range: The ND2-32 filter provides a decent range of light reduction for various shooting conditions.
Phone Compatibility: Designed to work with popular iPhone models, offering versatility for smartphone photographers.
Room for Improvement:

Image Quality Concerns: Some users have reported noticeable image quality issues, such as color shifts or vignetting, especially at the filter's extremes.
Filter Thickness: The filter adds bulk to your phone setup, which can be inconvenient for some users.

Overall:

The K&F Concept Magnetic Variable ND Filter is a decent option for smartphone photographers looking to experiment with light control. While the magnetic system is convenient, the potential image quality issues and added bulk prevent it from earning a full five-star rating. If you're willing to accept these limitations, the filter can be a useful tool for your mobile photography kit.

As an avid photographer constantly exploring new techniques and tools to enhance my craft, I recently invested in the K&F Concept 82mm Variable ND Filter, and I'm excited to share my experience with fellow photography enthusiasts. This filter has quickly become an indispensable part of my kit, offering unparalleled versatility and convenience for capturing stunning images in a variety of lighting conditions. The variable ND feature allows me to easily adjust the amount of light entering my lens, giving me greater control over exposure and enabling creative effects such as long exposures and shallow depth of field, even in bright sunlight. I was impressed by the filter's build quality – crafted from high-quality materials, it feels robust and durable, yet remains lightweight and easy to handle. Additionally, the slim design minimizes vignetting and maintains image sharpness, ensuring optimal performance with no compromises. Whether shooting landscapes, portraits, or action shots, the K&F Concept Variable ND Filter delivers consistently exceptional results, making it a must-have accessory for photographers seeking maximum flexibility and image quality. I wholeheartedly recommend this filter to photographers of all levels looking to elevate their work and expand their creative possibilities.

I bought the K&F Concept Variable ND Filter Neutral Density ND2-ND400 (9 apertures) with rotating ring to be able to use a fast ND with different densities. The packaging is very well made, solid and space-saving packaging. The glass filter is light and the density increase / decrease ring is liquid. It does not have a limit switch block.

The K&F Concept Nano-X True Color Variable ND Filter arrived quickly.

It is neatly packed in a chic pencil case that protects the filter well.
I would still like to see the filter designation on the pencil case so that I can find the one I'm looking for more quickly.

The filter itself works well.
It fits perfectly on my wide angle lens. With the right adapter rings, even on smaller lenses.

The settings can be continuously adjusted using the small red handle on the edge.
Unfortunately, the weather is rather dark and gray at the moment and the filter outside hasn't really been used yet.

Nevertheless, I am very satisfied with the filter and am looking forward to the next sunny day.

I received the K&F Concept Nano-X True Color - variable ND filter in the size 72mm free of charge as part of the Amazon Vine program.

The K&F Concept Nano-X True Color - variable ND filter comes in a noble and robust packaging. This contains some details about the product as well as some general notes and information about it. Inside there is the variable ND filter itself as well as a storage bag and some information material.

The quality of the K&F Concept Nano-X True Color - Variable ND filter is very high and generally very well made. The thread, which is for 72mm lenses on my example, fits very precisely and can be screwed onto my lens very easily. The gray filter can be continuously adjusted from ND2 to ND32. This is very practical and space-saving because you can only have one filter with you and still cover a wide spectrum with it. The material from which the frame and the glass are made is very valuable and this is reflected later in the image quality. The adjustment works without any problems and in general there is nothing wrong with the product. This variable ND filter from K&F Concept is perfect for my needs. The product does a solid job and the image quality is very good. My expectations were exceeded and I am more than satisfied. Therefore, this product is also very suitable as a gift. This product is very suitable for hobby photographers as well as professionals. So 5 stars from me for that. TOP!!!!

I ordered the ND filter from K&F Concept because I already have one in a different size and am very happy with it. With variable filters, there is a risk that these vignettes will conjure up images. That is not the case here. However, the filter could not be screwed onto the thread correctly. After a short contact with the seller's customer support and description with photos, a new product was sent to me. I can't complain about that.

This is my first K&F Concept variable ND filter. Got it to use for my video needs. It’s a solidly built filter with reusable packaging for storage. For the price point, I love it for taking videos. Especially on bright days when focusing in, this helps give a bit of ambiance and subject focus to my videos. I can’t speak to photos as I’ve not had the chance to take this out for any landscape shots. If I do, I’ll be sure to update. For the price point I find the 10 stops to be a great addition to my on the go gear for video needs.

I hope this review or even just the pictures were useful in your decision to purchase or not to purchase.

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This K&F Concept 55mm Variable ND filter fits my lens well. It is a well made quality product. The filter worked as well as some of my more expensive filters - very happy with it.