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Step to view a sample directly with your eye, hold the Foldscope with the blue side facing you and bring the lens to the eye.
While you view, point the back of the Foldscope toward a light source, such as a lamp or clear sky (but do not look directly towards the sun!)
Adjust the focus by nudging the focus ramp left/right with your thumb until the image appears clear, and pan to look at other areas of the sample by using your thumbs to shift around the lens stage.
Foldscope is a microscope with the following metrics:
Magnification: 140X
Resolution: ~2 micron
Back focal length: ~0.5 mm
Depth of field: ~0.01 mm
Field of view: ~0.5 mm (diagonal radius)
Foldscope is composed of paper components, magnetic components, and a lens.
The paper components are composed of a synthetic material, which functions to be waterproof, tear-resistant, and inexpensive.
The magnetic components function to help align/properly space the optic components, and to easily attach devices for phone viewing and projection.
The lens is a borosilicate glass ball embedded in a circular black plastic piece.3
Foldscope’s lens has a magnification of 140x, and that magnification is multiplied by the zoom on your phone. This means that if your phone camera has more than 7x zoom, you can view samples at over 1000x magnification!
If you have an LED light module, you can attach it as a light source on the back of your Foldscope. With the LED attached, you can lay your Foldscope on a flat surface for easier viewing and recording.