K&F CONCEPT 18 Pieces Filter Ring Adapter Set, Camera Lens Filter Metal Stepping Rings Kit (Includes 9pcs Step Up Ring Set + 9pcs Step Down Ring Set) Black

Perfect for my Sony a6400! I use this all the time for my filters! I usually buy big filters to fit multiple lens and these rings help fit my smaller lenses. It comes in multiple sizes, step up AND step down rings (I only use the step up rings but it’s always good to have the variation just in case) it super light in weight which is great for traveling in NYC, it doesn’t affect the image quality at all but I can’t speak for step down rings because at times it may produce some vignetting, the quality is is perfect and I’ve used it many times with no issues and is very durable especially at this great price.

Good stepup ring

Essential for filter users. Screw together well with each other, the filters, and my Canon R50, no problems at all. Saves money and space by not needing filters at different sizes.

Does the job.

Honestly, at first, I was skeptical that this adapter ring kit could solve my main challenge: mounting a professional 67mm matte box and filter system onto my Fujinon kit lens, which has a modest 52mm thread. I was prepared for disappointment, but the result was a pleasant surprise. The process was incredibly straightforward. By stacking several of the step-up rings, I was able to bridge the gap from 52mm to 67mm and mount the entire system flawlessly. As expected with so many rings stacked, I noticed some vignetting (dark corners) in still photos when using the lens at its widest 15mm focal length. The solution was simple: by zooming in just a little to 18mm, the vignette disappeared completely. Losing those 3mm of wide-angle in photos is a more than fair price to pay for achieving pro-level adaptability with a kit lens. But here is where this system truly shined for my video workflow. To my amazement, the vignetting present in 15mm photos completely vanishes when shooting video. This is due to the slight crop the camera automatically applies when its In-Body Image Stabilization (IBIS) is active. This crop is just enough to eliminate the dark corners, allowing me to shoot in both 4K and even 6.2K Open Gate using the full 15mm of the lens, with absolutely no issues or image loss. Furthermore, this kit is a future-proof investment. If I buy a lens with a 77mm thread tomorrow, I'll simply use fewer rings, and the vignetting will be even less of an issue, if there is any at all. In conclusion, this K&F Concept kit is the unsung hero of my setup. It's the piece that connects and unifies everything, allowing components of different sizes to work in harmony. It's an indispensable solution for anyone building a modular rig.

Had these as few years now and they're still working smoothly.

These rings are great if you don’t want to have to buy lots of filters

I purchased and tested with a few filters and lens caps. It seemed good enough but then I tried another set which I thought was better so I returned the KF set. I think I'll purchase the KF set again because the materials were solid, build quality and value are very good. Really useful storage and condensing options if you are good with your hands!