I tested the K&F Concept filters on a Canon EOS 5D Mark III with a Canon lens.
I am very satisfied.

The filters are very well made. They are delivered well packaged. It is also practical that you get them right away in a well-padded bag and can thus store them well protected in the photo backpack. So the filters can also get no scratches and you always have the filters of one size together.

Also supplied is a cleaning brush.

The filters are absolutely accurate fit. This is not self-evident for filters of this price category.
I received the filters on a test basis which has no influence on my rating.

Original photos

I have several camera bags now, and this one is at the top of my list. The bag is sturdy and sturdy. It's made for adventures. As someone with back issues, I appreciated the padding in the back. I love the side opening camera bay. This makes it easy to grab your camera quickly (with street photography, etc). The only thing I feel I should mention is that it's a little bigger than comfortable for me.

After several purchases of camera bags for my full size and lenses, I have always been disappointed in either the way the bag fits or its design or organization. This bag seems to suit my needs. Its versatile closure system allows you to access the contents in different ways, allowing you to organize the interior thanks to scratching dividers and place items where you want. The camera is accessed via a side pocket. So all you have to do is tilt the front pocket to access your gear. You can store your accessories safely and easily in the numerous pockets and pouches. Not tested with the tripod, but it also seems handy for storing this accessory.

Be that as it may, there are various large and small bags, so you have some freedom to store everything, not just camera accessories. Probably as many premium pockets as a bag this size. The wide opening when opening the zipper is also the reason why things are easy to put in and take out. There are many cheap and low-quality bags in the world, but I found a great bag for a long time. I have once again reassessed the high product attractiveness of the K&F Concept.

needed a camera backpack because I was tired of constantly lugging bags around on my shoulder strap. A camera backpack was necessary, especially for longer distances. After a short research and reading a few reviews, I chose this model. The backpack is relatively small and compact, but offers a surprising amount of storage space. A DSLR with a mounted lens and 3-4 additional lenses fit in easily. There are also many small parts compartments to store memory cards or tripod plates. A big plus point for me: my 15-inch Macbook can also be stored in a padded compartment. Overall, the workmanship appears to be of high quality, and the zippers also appear to be solid. In my opinion there is nothing wrong with this backpack.

This is a very nice high quality ND filter, as expected of K&F Concept. I'm using it with a Canon EOS 5D DSLR, and it is very fun to play with. I haven't used an ND filter like this before so I'm still learning, but you can definitely get some cool effects especially with moving water. The glass is high quality and the picture is sharp and clear. I have a couple of other K&F filters and this is just as nice to use as the others.

ordered the adapter to use a vintage Tamron mirror lens (5.6/350 mm) on my two Canon bodies EOS 5D mkIV and EOS 1Ds. Since both cameras are not listed in the compatibility list of the item description and one often hears (with other adapters) that the camera mirror can no longer move freely and therefore error messages or damage to the camera occur, I was curious whether that would also be the case my two cameras would work. It works out. The adapter is also seated without play, attaching and detaching is easy. It was clear to me beforehand that the focus and the time setting had to be made manually. Unfortunately, the invoice must first be requested from the seller, but it came within 24 hours as a PDF by email. However, it is an import invoice without deductible VAT and in the "worst case" the tax office will still have import sales tax when it is submitted. At the price of the adapter, however, that can probably be gotten over.

use the lens on my Canon 5d II full format camera - I am very satisfied with the imaging performance. Of course there is vignetting with an open aperture of 2.8 - but you hardly take pictures with it anyway. There are certainly better lenses - but you have to put down at least twice as much and therefore I can only recommend the lens to everyone who wants to use it from time to time. Anyone who needs a UWW professionally should take a look at the 11 or 15 mm from IRIX.