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500mm vs 600mm?

Started Nov 13, 2017 | Questions thread
Tazz93
Tazz93 Veteran Member • Posts: 3,484
Re: 500mm vs 600mm?

BirdShooter7 wrote:

ok so then if what you say is correct how come there is a minimum illumination required to achieve focus?

Maybe he's not explaining his point very well, let's see what he has to say. From Canon's AF sensitivity aperture breakdown, it's obvious light plays a big part with the AF's performance.

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