Good morning David, I've come across your channel regarding the nikon d500, at the moment I have a nikon z50 mirrorless camera which is great, but I'm considering getting a d500 to use with my sigma 150-600mm for birds and other wildlife. It has dual memory card slots a sd and a xqd slot, I've never had any use of xqd cards and are quite expensive, and apparently they are being fazed out so my question is are cf express cards the same and are they compatible with the d500?. Looking forward to hearing back from you, many thanks Steve H