Canon’s new 600mm and 800mm lenses

Started 3 months ago | Discussions thread
bclaff Forum Pro • Posts: 10,478
Re: DOE vs Phase Fresnel

Jack Hogan wrote:

bclaff wrote:

AiryDiscus wrote:

...

No, it doesn't simplify the lens design. My guess is that they use the front element as a stop, much as a telescope, so there is no stop at all (could be wrong). ...

FWIW:

US20190346660A1

(Example 3 is the 780mm lens)

Unfortunately I still haven't taught the Optical Bench to do diffractive elements

Are DOE elements the same as Nikon's Phase Fresnel, Bill? If so the bench would need a lot more detail on that front element.

I think for patent(s) give sufficient information but I'm unsure they present it in the same form so that may be a challenge when I get to this feature.

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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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