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Some scenes are best depicted in custom aspect ratios. This panel's
photo is an example. A wider-than-usual ratio permits display of
an eight-car Washington Metro train in front of the Library of Congress,
Capitol and Washington Monument without adding too much sky or
ground clutter.
Time out for a brief bit of (easy-to-understand) math:
aspect ratio expresses a photo's width vs. height. For example, an
aspect ratio of 2:1 means the photo is twice as wide as it is tall.
Most 20th century, consumer-grade, 35 mm film employed a 4:3 aspect ratio.
Televisions of that era adopted that same screen ratio. Since that ratio
looks older, perhaps you already noticed I employ it at this site for
most photos of the oldest rail lines.
During the 21st century, wide-screen televisions were introduced with
a 16:9 aspect ratio. That's a wider image than 4:3 (which is the
same as 12:9). For newer rail lines toured at this site, I adopted
a 3:2 ratio because that fits the screen of many tablet devices.
Some cameras let you choose from a list of aspect ratios.
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