After the YN 85mm F1.8R DF DSM, Yongnuo might soon release a second lens for the RF mount.
It seems the YN 50mm F1.8R DF DSM has been displayed at P&I Shanghai (image on top). No information about the release to the general public and about the specifications.
[via asobinet]
Canon might be set to release the long rumored (!) RF 200-500mm f/4L IS lens sometimes during Q4 2023, i.e. soon.
The RF 200-500mm f/4L IS will come with hefty price tag, though. The rumored price is $15.999 – not everyone’s budget. Says the source of the rumor:
[RF 200-500mm f/4L IS] the will be the RF replacement for the highly-regarded EF 200-400mm f/4L IS USM 1.4x. There will not be a built-in teleconverter in the RF version, which will help reduce weight, size and complexity, sadly its omission won’t reduce the price.
Do not waste time on rumors, use your time to go out and take pictures.
Source: Canon Rumors
And another Canon patent for lenses for the RF mount.
Canon patent application 2023104137 (Japan, published 7/28/2023) discusses optical formulas for three zoom lenses for the RF mount:
From the patent literature:
A zoom lens, an imaging device having the same, and an imaging system
To provide a zoom lens that is compact as a whole, has a high zoom ratio, and has high optical performance over the entire zoom range.
BACKGROUND ART
In recent years, there has been a demand for a zoom lens used in an imaging apparatus having an imaging device to have a compact overall system, a high zoom ratio, and high resolution (high optical performance). . In particular, zoom lenses are required to have high optical performance with substantially uniform resolving power from the center of the screen to the periphery of the screen.
However, in the zoom lenses disclosed in Patent Documents 1 and 2, since the relationship between the refractive powers of the lens groups is not appropriate, the lens size increases when the zoom ratio is increased, and astigmatism at the wide-angle end and coma at the telephoto end gets worse.
The present invention provides a zoom lens that is compact overall, has a high zoom ratio, and has high optical performance over the entire zoom range.
More Canon patents are listed here.
[via asobinet]
Another Canon patent application that was published yesterday.
Canon patent application 2023099389 (Japan, published 7/13/2023) discusses optical formulas and methods for two ultra wide zoom lenses.
From the patent literature:
A compact and lightweight zoom lens that has a wide angle of view and high optical performance over the entire zoom range is provided.
Description of the Related Art
In recent years, zoom lenses used in imaging apparatuses are required to have a wide angle of view and high optical performance as imaging apparatuses have become more sophisticated. Further, as a zoom lens having a wide angle of view at the wide-angle end, a negative lead type zoom lens in which a lens group having a negative refractive power precedes the zoom lens is known.
However, in the zoom lens disclosed in Patent Document 1, the focal length of the first lens group is set to be small in order to widen the angle of view. . In addition, the back focus and the refractive power of the first lens group are not appropriate, and it is difficult to further reduce the diameter of the front lens and shorten the total length. The zoom lens disclosed in Patent Document 2 has a short back focus and a refractive power arrangement suitable for shortening the total length. However, the lens groups succeeding the first lens group all have positive refractive power, and it is difficult to narrow the position of the front principal point toward the first lens group when viewed as the entire succeeding group. is difficult.
In order to obtain a compact and lightweight zoom lens that has high optical performance over the entire zoom range while achieving a wide angle, the refractive power and lens configuration of the first lens group, and the lens groups following the first lens group It is important to set the refracting power and placement position of the lens appropriately.SUMMARY OF THE INVENTION
It is an object of the present invention to provide a compact and lightweight zoom lens that has a wide angle of view and high optical performance over the entire zoom range, and an imaging apparatus having the zoom lens.
Example 1
Example 2
More Canon patents are listed here.
[via asobinet]
And here we have another Canon patent published today.
Canon patent application 2023099385 (Japan, published 7/13/2023) discusses optical formulas for a RF 200mm f/2 IS lens.
From the patent literature:
To provide an optical system having a plurality of focusing groups and anti-vibration groups that can be made compact and lightweight in addition to excellent optical performance.
Description of the Related Art
In a telephoto lens equipped with a plurality of focusing groups that move during focusing from infinity to the closest object and a vibration reduction group for correcting image blur, in addition to good optical performance, There is a demand for miniaturization and weight reduction of the entire lens system.
The present invention provides an optical system having a plurality of focusing groups and anti-vibration groups, which can be reduced in size and weight in addition to excellent optical performance.
Example 1
More Canon patents are listed here.
[via asobinet]
Here is a new Canon patent, the first of four that have been published today.
Canon patent application 2023099386 (Japan, published 7/13/2023) discusses optical formulas for a bunch of fast prime lenses.
From the patent literature:
To provide an optical system capable of satisfactorily correcting aberrations over a wide range of object distances while achieving miniaturization of a focus lens group.
Description of the Related Art
In recent years, an optical system used in an imaging apparatus has achieved a reduction in the size of the entire lens diameter of a focus lens group. It is required to be able to satisfactorily correct surface curvature and the like. As an optical system that satisfies these requirements, Patent Document 1 discloses a positive refractive power first lens group, a negative refractive power focus lens group, and a positive refractive power lens group, which are arranged in order from the object side to the image side. is disclosed having a focus lens group of .
However, in the optical system described in Patent Document 1, when the aperture of the optical system is increased, the focal length of the focus lens group having a positive refractive power and the second optical system arranged on the image side of the focus lens group The focal length of the 4 lens group is not properly set. For this reason, in the optical system described in Patent Document 1, it is difficult to suppress aberration fluctuations during focusing when the optical system has a large aperture.SUMMARY OF THE INVENTION
The present invention provides an optical system capable of satisfactorily correcting aberrations over a wide range of object distances while achieving a compact focus lens group.
Example 1
Example 2
Example 3
Example 4
More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:
[via asobinet]
Notice
This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the cookie policy.
By closing this banner you agree to the use of cookies.