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This page provides some technical analysis of the pictures in the
gallery.
It is based on information extracted
from 7584 images, which should represent a valid sample.
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Focal Length
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The graph below shows the number of times that lenses of
different focal lengths (or, in many cases, zoom settings) have
been used for images in the gallery.
The values used are the equivalents for a 35mm film frame rather
than the actual focal length, and are converted to the
nearest “classic” lens length. Images without focal
length information have been ignored.
![[Focal Length Plot]](graphics/fl-plot.gif)
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ISO
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This plot shows how different ISO
sensitivity settings (or film speeds) have been used:
![[ISO Plot]](graphics/iso-plot.gif)
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Shutter Speed
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Shutter speed, using the nearest full stop:
![[Shutter Speed Plot]](graphics/speed-plot.gif)
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Aperture
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Aperture, at one stop intervals:
![[Aperture Plot]](graphics/aperture-plot.gif)
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EV
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Exposure value, as deduced from the recorded
aperture, shutter speed and ISO. Note that typical EVs are
15 for bright sunlight, 12 for heavy overcast, 8 for bright
street scenes and 6 for artificial light in homes:
![[Exposure Value Plot]](graphics/ev-plot.gif)
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Year
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Shown by decade, noting that the dates of some early images can only be
estimated:
![[Decade Plot]](graphics/decade-plot.gif)
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Medium
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The table below summarises the original media for all the images in the
gallery. Many of these do not have any technical
information suitable for use in the graphs above.
| Medium | Count | More Info |
| transparency | 2935 | 28 |
| digital | 2578 | 20 |
| print (monochrome) | 987 | 328 |
| negative (monochrome) | 601 | 67 |
| print (colour) | 251 | 62 |
| negative (colour) | 171 | 14 |
| ciné | 59 | 56 |
| other | 2 | 2 |
| TOTAL | 7584 | 577 |
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