Hi all - the images below help illustrate some of the concepts I'm talking about today. I'll refer to them in the podcast, as I go along. For more information regarding some of the really technical stuff, check out the following links:
F-Number
Depth of Field
1. Large Aperture 2. Small Aperture

F-stop Values Relating to Aperture Size
Depth of Field

Images in this post are from Wikimedia Commons.

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