The 5% Solution

Started 10 months ago | Discussions thread
Stephen Barrett
Contributing MemberPosts: 645Gear list
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Re: The 5% Solution
In reply to MarioV, 10 months ago

Ah, Mario, another challenge!

Here is my answer to the challenge:

Telephoto shots display 5% more field of view than what should be able to fit on a normal 1/2.3" sensor (6.17 mm x 4.55 mm). Possible explanations are:

  1. Sensor is 5% larger than normal. This is so large that the specified crop factor of 5.58 cannot be correct, regardless of which of the two definitions is used.
  2. Focal lengths are 5% smaller than specified, leading to a smaller image that can fit on a normal-size sensor. Bob Atkins says that SLR telephoto lenses have, on average, 5% smaller focal lengths than specified. Maybe the same is true of PowerShot lenses.
  3. Some combination of 1 and 2, such as 2% larger sensor, which would agree with the area-based definition of crop factor, and 3% smaller focal length.
  4. I have made multiple blunders.
 Stephen Barrett's gear list:Stephen Barrett's gear list
Canon PowerShot SX30 IS +3 more
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