Review on Arducam for Raspberry Pi Camera: Interchangeable CS Mount Lens for Pi 4, 3, 3B+ | 5MP OV5647 1080P by Randy Bin

Works as expected. A CS mount is available, the lens itself is more suitable as a dust cover. ;) The end of the strobe and frex pens is excellent. Mounting hole pattern + hole size is an improvement over the original design. I've read negative reviews of this board that reported symptoms known to occur due to improper ribbon connector insertion. If your Pi camera connector is powered from shorted pins you will actually damage it. Please be careful when handling the rather thin connectors for the 15-pin cable. Very acceptable open source hardware that fills a niche market.