Name: CamCtrl for iOS with Preview!
Rating: 4.2 (66 reviews)
Author: Strafe

CamCtrl for iOS lets you trigger your iPhone camera from your Garmin watch. Live preview on the watch lets you frame the shot, then snap photos or start/stop video recording with a button press. If you have issues, please contact the developer!
Requires installation of the free CamCtrl app on your iPhone. 
Control camera settings from the watch or phone app. Online preview is a color image, offline is a black and white dithered image. Frame rate depends on the watch but is on the order of one frame per second.
iOS App: https://apps.apple.com/us/app/camctrl/id6752837816
See the manual for more information: https://mywatchphotos.com/camera_instructions