Make deep focused macro images with Raspberry Pi  If you ever
tried to make macro photography you noticed that it is hard to
focus 3D objects. Only at some depth you get clear view where
other areas stay blurred. Of course there are expensive
equipment available that helps expand field of depth, but who
would want to spend money for non professional purposes. David
found another solution to solve this problem. And this only cost
a Raspberry Pi. His experiment consists of camera, old flatbed
camera and Raspberry Pi.  Deep focused macro image  So he took
scanner top and placed camera on a rail so it could move along.
Connected RasPi to motor through stepper motor driver using four
GPIO pins. Another pin he used to control camera shutter. The
rest secret lies in Python script where wiringpi library is used
to access I/O pins. The stand takes 42 stacked images at 6 fps
rate. Each image is taken while camera is moving slowly towards
object with fixed focal length.  So in all taken photos the
object is covered with