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

Started 2 months ago | Discussions thread
Hubertus Bigend
Hubertus Bigend Forum Member • Posts: 71
Re: Moreover, they finally demonstrate where equivalence stops

Astrotripper wrote:

Wu Jiaqiu wrote:

Adrian Harris wrote:

Yet reading in the Canon forum has given me the impression that the fresnel lens is causing some on sensor PDAF focusing issues. Is this true?

i shot jet aircraft for a few hours with a 300mm nikon pf fresnel lens, the af was superb on it

Canon’s DO is not the same thing as Nikon’s PF.

Canon's conventional, say, 300mm f/2.8 is not the same thing as Nikon's conventional 300mm f/2.8, either. The difference between Canon's DO and Nikon's PF designs is not so much more significant. They're both based on introducing one or two fresnel elements into the design, which is what makes them shorter than a conventional lens would be.

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