Posted in News
19/11/2021

Canon patents zoom lenses that get shorter as they get longer

Well, it is a bit counterintuitive. Spotted via asobinet, Canon has patented a mechanism for a zoom lens mechanism that in truth will get shorter as you building up the focal period. Yes, that’s proper, the complete opposite to how zoom lenses generally paintings.

The patent was once revealed on November 18th to supply zoom lenses with huge apertures and small measurement with prime optical efficiency. Quite a lot of lens examples are integrated within the patent, together with a pair with levels of roughly 28-70mm and 28-60mm with f/2.8 and f/4 most apertures respectively.

The patent describes the issue that it solves:

INDUSTRIAL APPLICABILITY: A zoom lens and a picture pickup tool having the similar.

PROBLEM TO BE SOLVED: To supply a zoom lens having a big aperture ratio and a small measurement however having prime optical efficiency, and a picture pickup equipment having the similar.

In fresh years, with the expanding capability of symbol pickup units, there’s a call for for a compact and light-weight zoom lens having a big aperture ratio. As a zoom lens that satisfies this requirement, a destructive lead kind zoom lens through which a lens workforce having a destructive refractive energy is organized at the maximum object aspect is understood.

An object of the current invention is to supply a zoom lens having a big aperture ratio and a small measurement however having prime optical efficiency, and a picture pickup equipment having the similar.

It then is going on to explain the aforementioned 28-70mm f/2.8 and 28-60mm f/4 zoom lens specs.

28-70mm f/2.8

Focal period: 28.84-67.90
F worth: 2.91
Half attitude of view: 32.65-17.67
Image top: 21.64
Overall period: 149.46-115.94
Back focal point: 13.48-27.78

28-60mm f/4

Focal period: 28.84-60.00
F worth: 4.12
Half attitude of view: 32.68-19.83
Image top: 18.50-21.64
Overall period: 141.33-104.61
Back focal point: 19.70-35.51

Physically, each lenses seem to be roughly the similar measurement on the quick finish however shrink down as you zoom in, which sounds more or less bizarre, but additionally cool. Whether or no longer this era can be carried out in the actual international and the way sensible it will be is still noticed. If such lenses do come to fruition, regardless that, I ponder whether we’ll begin to see the focal period lock on the lengthy finish of the variety as an alternative of the fast finish with the intention to stay them extra compact for storing in our camera baggage.

Unfortunately, no hyperlink was once posted to the unique patent, however you’ll be able to to find out extra about it here.

[via asobinet]

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