What are these numbers below the distance scale of my lens?
Photography Asked on July 6, 2021
On my Canon EF35mm F2 IS USM (my first prime lens ever which I just bought used) there are the numbers 22, 11, [line with red dot], 11, 22 written below the distance scale.
From the manual of the lense I learned that they are seemingly called "distance index", but the manual doesn’t mention what they are. Even googling this word, and also several other related search terms like "lens numbers below distance scale", doesn’t find me anything.
What do the numbers and the red dot mean, and what are they used for?
One Answer
The 22 and 11 indicate the depth of focus when stopped down to that particular aperture. E.g. in the image, with aperture f/22 everything from about 0.6 to 2 meter away is in focus (as a rough guide).
The red dot, if I'm not mistaken, indicates the focus distance for infrared imaging instead of visible light.
Correct answer by Roel Schroeven on July 6, 2021
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