Adjust the angle of the camera so that you can see the whole spectrum, and glue it in place

Even with the top open, you can see that there are finer lines (indicating good focus and a narrow, precise slot) and see the range of colors. An angle of 40 degrees away from the slot should be good but you may need to make finer adjustments, and it varies by camera. Once you have it, glue the camera in place and secure it with a lot of hot glue.

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Taken on October 26, 2011