Big Colors Talk: Section 4: Magnitudes

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This is the fourth section from a long talk on filters, colors, magnitudes and more. This one covers magnitudes.
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Hello Luisa. Great series, thanks for posting!
I have a question though. I do not understand why you define flux as "energy per unit area per unit time per photon". Shouldn't that be per Hz (or Ångstrom)?

theovangrunsven