This shows a close up of the Zorki's lens. Here is a moth. It is about a centimeter on a side, and the effective magnification is about 30x. The resolution is about 100 microns, equivalent to what could be achieved with a good disecting microscopes. But, although not obvious here, the depth of field is about 1 cm, better than could be achieved with a light microscope.
Many new checks have a signature line with microprinting, to try to prevent forgery.
This is something you see every day. Click on the image to see a larger picture and learn what it is. Here is an old-fashioned image of the above, the nib of a fountain pen. You can see the split for the ink. Here's an image of the side of the fountain pen where the cap meets the body.