The term stop is sometimes confusing due to its multiple meanings. A stop can be a physical object: an opaque part of an optical system that blocks certain rays. The aperture stop is the aperture that limits the brightness of the image by restricting the input pupil size, while a field stop is a stop intended to cut out light that would be outside the desired field of view and might cause flare or other problems if not stopped.
In photography, stops are also a unit used to quantify ratios of light or exposure, with one stop meaning a factor of two, or one-half. The one-stop unit is also known as the EV (exposure value) unit. On a camera, the f-number is usually adjusted in discrete steps, known as f-stops. Each "stop" is marked with its corresponding f-number, and represents a halving of the light intensity from the previous stop. This corresponds to a decrease of the pupil and aperture diameters by a factor of v2 or about 1.414, and hence a halving of the area of the pupil.
Is this making any sense? Well here's something else that doesn't make sense. And so we placed a cache there. You would think that with all this talk about film and cameras and such, the container might be a 35mm. That would have been really nice, but that's not what we had. Besides, we're talking f-stops and aperatures. Those aperatures are tiny openings that allow the light to go through. In fact, they are so small, sometimes they are called nanotures.
And if you believe that, then you are probably the one that put this thing here that caused us to stop and take notice.
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