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500mm vs 600mm?

Started Nov 13, 2017 | Questions thread
WilbaW
WilbaW Forum Pro • Posts: 11,643
Re: 500mm vs 600mm?

BirdShooter7 wrote:

This will be my last post to you on this issue. I'm quite tired of wasting time with your irrelevant comments.

This pretty well sums up my understanding of how the phase detect AF works and well agrees with what Canon themselves has published.

https://www.the-digital-picture.com/Photography-Tips/canon-eos-dslr-autofocus-explained.aspx

Yes, that's consistent - "a wider aperture [the F number associated with a PD AF sensor array pair] simply means a wider baseline for the rangefinder system is required for that line [PD AF sensor array pair] to function."

So you provide support for what I've been saying all along, agreed explicitly with it at one point, and accept a third-party explanation for it, but still insist that I'm wrong... I can't figure that out!

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