Looking for Ideas – Quick Reference Booklet

I am thinking of making a quick reference card deck that is compact enough to slip into a bag. It would have a few lookup tables that would come in handy:

  • Conversion between feet, meters, nautical miles, and statute miles
  • Typical color temperatures for sunrise, sunset, sunny day, and cloudy day
  • F stop increments
  • ND filters and number of stops

Anything else? Also, what length/width works best?

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