improved README

README.md

@@ -2,6 +2,8 @@
 
 A stepper motor controller for use in photography.
 
+![PhotoStepper](example_images/220222_controller.jpg)
+
 This is a device that can be used to control a stepper motor and a camera, to
 make a defined number of photos with a defined movement in between. A stepper
 motor can be attached to a rotating platform or to a linear drive, so either
@@ -97,6 +99,29 @@ The main menu offers the following features:
   Run the whole setup, starting with settle time and ending with returning to
   the starting point.
 
+## Usage
+
+I built myself a linear rig to move my camera along the scene:
+
+![Linear rig](example_images/220222_linear_rig.jpg)
+
+The rig is mounted on a tripod, my camera with all the needed equipment for
+macro photography atop of that.
+
+Then I setup the scene I want to capture. I focus on the main feature of my
+motive, set the camera to manual focus and setup exposure time and aperture.
+After a testshot I can estimate the depth of field that gives me a sharp
+picture. The I use the jog function of the device to place the camera closer to
+the object, so the focus plane moves behind the object. I estimate the total
+depth of field I want to get in my final picture and set the correct values for
+my scene.
+
+After everything is prepared, I select Run to capture the whole scene. The
+camera takes a picture, moves slightly back, takes the next picture, and so on.
+When the set number of steps is reached, the camera gets moved back to its
+original position, that gived me the chance to make slight changes to the
+object and rerun the program with the same parameters.
+
 ## Example results
 
 This is the first image that was made using this project: