David Martin wrote:
The inexpensive $18 Nikon ML-L3 will work; it uses infrared so has limited distance - 16 feet in front of camera but less when used behind camera.
I've used the Vello FreeWave Plus on my D500. It's true radio wireless (2.4 GHz) rather than infrared, so has a working distance of up to 320 feet. Has settings for delay, multi-exposure and long exposure. I've been very pleased. Current price $60 at B&H or Adorama.
Reading your post reminded me I had one sitting in the back of the cabinet. Somebody had given it to me quite a while back. I opened it up to find the original batteries, still in the cellophane wrappers, but totally corroded. I guess I'll get some batteries and give it a try.