I spent a long time buying a filter because on the one hand I didn't know if I needed something like this and on the other hand because I had already tested a 0815 filter with miserable results and the costs for such a part are not insignificant. The question now was whether I should get several filters or a variable filter. In view of the price, the question ultimately became irrelevant. The first tests were able to dispel concerns that the image quality suffers, as with the filter mentioned at the beginning. The images are slightly blurry, but really only marginally. The weakest position extends the exposure time by a little more than 2. In my experiment (Nikon D7200, Sigma 18-35, K&F variable ND filter 77mm ND2-ND400 with adapter ring) I set the aperture to 2 in sunshine. 8 raised to expose well at 1/8000 without a filter. With the filter screwed on in the "MIN" position, the shutter speed went up to 1/3200. I turned the filter from mark to mark and came up with the following shutter speeds calculated by the camera: 1/3200, 1/3200, 1/2500, 1/2500, 1/2000, 1/1250, 1/800, 1/400, 1/125, 1/20(X-Cross, but underexposed). As you can see, hardly anything happens at first and the markings also do not allow any ND value order to be determined, which according to the logic of the first point is 2, the second 4 and the third 8.... So it's time to try it out. In the "MAX" position (1/20) the images are unusable because of the X-Cross, but this is really only the case in the absolute max position, and between the penultimate with 1/125 and Max intermediate positions are also possible where I got useful up to 1/30. So a usable ND value of 266 is calculated. This value is now completely sufficient for filming, because who says that I can't set the shutter speed higher than 1/60, which was the rule of thumb in the early days of analogue filming. Enough theory, I think the filter is an absolutely good investment.
Unscrewing is completely problem-free and if there was a color cast, it was due to the camera (Nikon D7200).
I've uploaded a few pics:
1.) 100% topless bottom view with filter at 5th position (1/2000)
2.) MIN - position
3.) Last usable position
4.) Filter to with X-Cross where the camera with the exposure of my camera (Nikon D7200) failed and I had to raise 2 values ​​in post-processing to be able to recognize something.

This has been by far the best camera I have used so far. The rotation is a game changer.

This has been by far the best camera I have used so far. The rotation is a game changer.

needed a strap for my second camera body. I photograph weddings and events. I'm not in harsh conditions, but I need a sturdy, reliable belt. At the same time, I don't see any value proposition for purchasing the universally popular PD strap. Is it really worth over $70. I say no, this works for less than half the price.

The K&F Concept Adjustable DSLR Camera Hand Strap is a great option for camera users who want to carry their camera safely and comfortably. The lightweight and durable design ensures your camera is held securely, while the adjustable strap allows for a custom fit that's comfortable even during extended use. This wrist strap is compatible with a variety of camera brands and models, making it a versatile option for any photographer.

use this on a Sony DSC-F828 camera. Fixed lens, swiveling body and a very heavy camera. What I like: • Beautiful gray herringbone pattern, smooth and comfortable. • Heavy duty security/anti-theft buckles. • Loops on the camera body (with built-in wear indicators!) are much thicker and stronger than most camera straps; • Leather patches, two of which keep the body loops *secure*. • I'm a big guy who also uses the camera strap as a wrist strap. This strap is easy to use as it is generously long yet easy to wrap. What I don't like: • The adjustable strap buckles are made of aluminum and can scratch my vintage camera. That's all. I love the “old school” look and feel of this 50s camera strap. It's so comfortable that I don't even need (or want) a shoulder pad. But the aluminum buckles make me very nervous about using this strap or storing my camera in my bag with the strap in it.

Quality best inspection camera I ever own.

Best Tripod out there.