<b>Building the lens is easy</b>: Just glue thelower two pieces together, then insert the tube with the marble. "Focusing" can be achieved by moving this tube back and forth. <br><br>The lower two pieces make also a perfectly fitting Micro Four Thirds bayonet mount in case you need one for other experiments. <br><br>The contrast of the sample photos is
enhanced in photoshop afterwards. Otherwise this is how they come out of the camera.
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