Difference functionality of 580ex ii flash fresnel lenses?

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ofquiet
ofquiet New Member • Posts: 13
Difference functionality of 580ex ii flash fresnel lenses?

Hi, pretty nerdy question, but does anyone know what different functions the two layered fresnel lenses in the Canon 580ex ii head do? I was just repairing mine and noticed the two very different lenses and am curious how they behave. I couldn't find anything online, so thought I'd ask here.

Specifically parts CY2-4224-000 VS CY2-4225-000.

Thanks!

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Tod

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