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Canon publishes patents for a really compact 28-70mm f/2.8 zoom lens


Canon has printed a patent for 2 new zoom lens within the 28-70mm f/2.8 and 28-60mm f/2.8 focal size ranges. What makes them notably fascinating, although, is how tiny they’re, for zooms with such huge aperture zooms, with each coming in at somewhat over 105mm lengthy on the shorter finish of their focal size restrict of ~28mm. Even at their most zooms of 60mm and 67.9mm, they nonetheless solely hit 132.38mm and 138.40mm respectively, making them very compact certainly.

The “Downside to be solved”, in line with the Asobinet’s quote from the patent is “to offer a zoom lens having a brief whole size and a small dimension however having excessive optical efficiency”. And it means that because of latest growth in cameras – specifically, Canon’s gone mirrorless – it’s now potential to create a zoom lens of this focal size vary and huge aperture that meets these parameters.

Overview

  • [Public number] P2022091621
  • [Release date] 2022-06-21
  • INDUSTRIAL APPLICABILITY: A zoom lens and a picture pickup gadget having the identical.
  • [Filing date] 2020-12-09
  • [Applicant]
    [Identification number] 000001007
    [Name or name] Canon Inc.
  • PROBLEM TO BE SOLVED: To offer a zoom lens having a brief whole size and a small dimension however having excessive optical efficiency, and a picture pickup equipment having the identical.
  • [0002]
    In recent times, with the rising performance of picture pickup gadgets, there’s a demand for a compact and light-weight zoom lens having a big aperture ratio. As a zoom lens that satisfies this requirement, a destructive lead sort zoom lens by which a lens group having a destructive refractive energy is organized on the article aspect is thought (see Patent Doc 1 and Patent Doc 2).
  • [0006]
    Within the zoom lens of Patent Doc 1, the refractive energy of the primary lens group is strengthened, and the motion locus of the primary lens group throughout zooming turns into a considerably reciprocating locus, in order that the overall size of the zoom lens on the telephoto finish could be elevated. turn out to be longer. As well as, the again focus is lengthy, and it’s tough to shorten the overall size of the zoom lens. Additional, the thickness of the primary lens group turns into giant as a result of aberration correction within the first lens group, which isn’t preferable from the perspective of miniaturization and weight discount.
  • [0007]
    Within the zoom lens of Patent Doc 2, the refractive energy of the primary lens group is powerful with a purpose to acquire a zoom magnification, and the configuration of the next group is a four-group configuration as much as the fourth lens group. If a bigger aperture ratio is aimed toward, varied aberrations and zoom fluctuations of aberrations within the telephoto area can’t be suppressed, and it turns into tough to fulfill good optical efficiency over the whole zoom vary.
  • [0008]
    An object of the current invention is to offer a zoom lens having a brief total size, a small dimension, and excessive optical efficiency, and a picture pickup equipment having the identical.
  • [0038]
    Within the zoom lens of every embodiment, with a purpose to guarantee good optical efficiency even at a detailed object distance, two or extra lens teams among the many lens teams organized on the picture aspect of the primary lens group L1 are centered. It’s preferable to have a so-called floating configuration by which the lens strikes on the time.

Instance 1 – 28-70mm f/2.8

  • Focal size: 28.84-67.90
  • F worth: 2.91
  • Half angle of view: 32.68-17.67
  • Picture top: 18.50-21.64
  • Total size: 138.40-105.42
  • Again focus: 10.97-21.12

Instance 2 – 28-60mm f/2.8

  • Focal size: 28.84-60
  • F worth: 2.91
  • Half angle of view: 32.68-19.83
  • Picture top: 18.50-21.64
  • Total size: 132.38-106.85
  • Again focus: 13.47-23.82

As all the time, a patent doesn’t essentially imply {that a} lens is on the way in which, however given the drive for smaller and lighter gear – which was kinda the entire promoting level for mirrorless – it wouldn’t shock me if we finally heard one in every of these being introduced.

[via Asobinet]



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