Canon's release of 600/800mm f11 lenses PROVES you don't need Cannons!

Started 2 months ago | Discussions thread
Tony Rogers Senior Member • Posts: 1,788
Autofocus performance

Would I be right in saying that an f/11 lens on full frame should have a technically more difficult job focusing with pdaf than an f/5.6 lens on m43? I say this because my understanding is that pdaf accuracy is dependent on angles and working with an f/11 light cone provides a narrower triangle than working with an f/5.6 light cone. Even mirrorless cameras stop using pdaf at high f numbers. (Apparantly, the A9II can use pdaf up to f/16 though).

Having said that, obviously a lot depends on the implementation. I bought my Sony A9 II and 200-600mm f/5.6-6.3 because I wanted better C-AF than the E-M1 III withh 300mm f/4. And it is faster and more accurate. It also works pretty well at f/9 with the 1.4x teleconverter. But not every camera has the A9/A9II stacked sensor and processor.

 Tony Rogers's gear list:Tony Rogers's gear list
Olympus E-M1 III Olympus 12-40mm F2.8 Pro Olympus 40-150mm F2.8 Pro Olympus M.Zuiko 300mm F4 IS Pro Sony FE 200-600 F5.6-6.3
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