Yes, you are able to zoom in and zoom out on the photos. While you are viewing a single photo, rotate the control dial to the right to select different zoom levels. The levels are 2x, 5x, 7x, and 10x. You can rotate the control dial to the left to go the other way on the zoom levels.
When you are viewing a single photo, double tapping on the LED screen zooms in by 2x from the center of the photo. Single tap on the LED screen to go back to viewing the photo.
Regardless of whether you are viewing a single photo in original zoom or at any zoom level, zoom in/out by gesture is supported.
The LED screen will only show letters when zoomed in by 10x.
You can go back to viewing a single photo with a single tap on a zoomed in photo.