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Measurement of microscope capabilities.

by mat on March 27th, 2010

As requested (by uplink) here are some images and calculations of the microscopes maximum zoom.

The images are taken with the edge of the camera case pressed right up against the ruler. You could probably remove casing to increase zoom slightly, or create a slot to slide a microscope slide into it. The camera has two focuses the first:

Usb digital microscope's first zoom level of a ruler (markings at 0.5mm)

Usb digital microscope's first zoom level of a ruler (markings at 0.5mm)

And the second (maximum zoom):

Usb digital microscope's full zoom level of a ruler (markings at 0.5mm)

Usb digital microscope's full zoom level of a ruler (markings at 0.5mm)

I am using my laptop screen as a typical screen and viewing the image at 100%. Poor mans calculations give you the following for the first focus and second focus:

1mm displayed over 40mm: zoom ~ 40x
1mm displayed over 150mm: zoom ~ 150x

(Note: Measuring magnification level is rubbish as it depends on screen the image is viewed on, so viewing it on a projector would make the statistics seem more impressive.)

The minimum zoom is less than this as we can move the camera further from the object:

Usb digital microscope's minimum zoom level of a ruler (markings at 0.5mm)

Usb digital microscope's minimum zoom level of a ruler (markings at 0.5mm)

Which is about 15x zoom. The microscope box states the zoom is between 10x and 200x, which from these tests seems a little over-exaggerated but not by much.

3 Comments
  1. uplink permalink

    thanks mat. this really help a lot. i believe this is more than what i need.

  2. Mario permalink

    Hi, please where is the distance from microscope to make the first image? 0,5mm
    thanks

  3. @Mario In both images the microscope (or it’s casing) is pressed against the ruler, only the position of the lens inside the microscope has changed.

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