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

Started 3 months ago | Discussions thread
Wu Jiaqiu
Wu Jiaqiu Forum Pro • Posts: 26,792
Re: Moreover, they finally demonstrate where equivalence stops

Adrian Harris wrote:

Astrotripper wrote:

Wu Jiaqiu wrote:

MHshooter wrote:

There are optical downsides to fresnel lenses. I'd prefer if they (Olympus) stuck with making absolutely top-flight optics.

i've used both of the Nikon pf lenses and have never experienced optical downsides from them, i'm not saying they don't exist but just maybe they are a little overstated.

I would agree. The one particularly glaring feature of PF lenses is completely irrelevant to typical uses of such a lens.

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

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the computer says no

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