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This week I began to collect samples (such as rotting water from flower vases at the cemetery) to look at under the microscope. | This week I began to collect samples (such as rotting water from flower vases at the cemetery) to look at under the microscope. | ||
I | I used my microscope to photograph my [[wikipedia:iPod Touch|iPod Touch]] screen in order to make calculations of the magnification depth of my microscope. | ||
To find out how big the surface is we are looking at, I captured a piece of a screen/display and counted the pixels. We tried an [[wikipedia:iPod Touch|iPod Touch]] which has a widescreen with the following specs: | |||
* resolution is 960 x 640 pixels | |||
* physical size is 75 x 50 mm | |||
Hence we can calculate the pixel density of the device: | |||
* 0,078125 mm per pixel (or 12,8 pixels per mm) | |||
[[File:IPod Touch screenshot1.jpg|250px]] | [[File:IPod Touch screenshot1.jpg|250px]] | ||
On our screen capture through the microscope we see approximately 5,8 x 4,2 pixels of the screen (one pixel consists of a triplet of red, green and blue). Now we know that we are looking at a surface of ~ 0,45 x 0,33 mm. | |||
To calculate the magnification factor the pixel density of the display must be taken into account. |