Here is a new Canon patent application, for a bunch of fast primes for the RF-S mount.
Canon patent application P2023130885 (Japan, published 9/21/2023) discusses optical formulas for RF-S mount prime lenses:
11mm F2
13mm F2
22mm F2
30mm F2
From the patent literature:
An object of the present invention is to provide a rear focus optical system that is compact and capable of good aberration correction.
BACKGROUND ART
In imaging, it is required to suppress the generation of noise during zooming and focusing. In order to suppress noise during focusing, the rear focus (inner focus) method, in which focusing is performed by moving the lens group closest to the image side than the lens group closest to the object side, is recommended because it provides the best sound isolation effect from the object side lens. suitable.
Rear focus type optical systems are also required to be compact and have good aberration correction. In order to realize such an optical system, it is necessary to appropriately set the lens arrangement and the focal length of each lens.
The present invention provides a rear focus type optical system that is compact and capable of good aberration correction, and an imaging device equipped with the same.
A new Irix lens, the Irix 30mm f/1.4 has been announced. The lens will be available for sale in October 2021, price not yet disclosed. A Canon EF mount version will also be released.
Press release:
Irix 30mm f/1.4
Irix brand announces new photographic lens with 30mm focal length!
The newest Irix 30mm f/1.4 lens is a product based on the 30mm Cine model, and therefore intended for the much more demanding film industry market. The entire optical structure of the lens is identical in both versions – the main emphasis here is on the vividness of the image. Of course, the photographic version has a completely different housing, while retaining the optical properties of the cine version.
Irix 30mm f / 1.4 – main features:
● Beautiful Bokeh ● Fast f/1.4 Aperture ● Rear focusing ● Weather-sealed construction ● Aperture control from the camera ● Focus confirmation on the Camera ● Compatible with PASM semi-automatic modes ● Full record of exposure parameters in EXIF ● 61,9 degree field of view ● “Focus Lock” function ● 140-degree rotation angle of the focus ring ● Reinforced internal structure ● 86mm filter mounting front thread ● Mounts: Nikon F, Canon EF, Pentax K
Optical properties
The Irix 30mm F / 1.4 features a modern optical design that includes 3 ultra-low dispersion glass elements, 2 high reflectance glass elements and one aspherical lens. There are a total of 13 elements in 11 groups that provide sharp details, vivid colors and ultra-low distortion – 0.95%. However, what deserves special attention is the smoothness and “cine look” of the image it offers. The lens is designed to work with 35mm full frame sensors. It is worth emphasizing the use of a new, 11-blade design aperture with rounded edges, which ensures a pleasant and very vivid background blur. It works in the range of f/1.4 to f/16.
DRAGONFLY Version – Characteristics
The lens housing is a continuation of the Dragonfly manufacturing standard known from earlier Irix models (45mm and 150mm). It’s most important aspects are:
● Reinforced internal structure based on metal elements ● Scratch-resistant lens finish ● Anti-slip focusing ring with special finish for easy operating ● Engraved markings filled with UV-reactive paint ● Sealings to protect against dust and water ● Hardcase included
Focusing Ring
A special focusing ring with a characteristic shape has become a kind of hallmark of Irix 150mm and 45mm lenses. Many of our clients pay attention to the convenience it provides. The newest Irix 30mm is following same way. Special texturing and properly selected rubber material which covers it, allows for reliable and precise focusing. Dedicated emboss lets you to feel the ring’s position. This makes focusing even easier!
“Focus Lock” function
The Focus Lock function is also a hallmark of Irix lenses – it allows you to lock the focusing ring in a specific position. It’s especially useful when you want to keep a specific distance to the photographed object (zone-focusing) or you want to keep perfect focus at infinity in landscape photography or astrophotography.
Designed for any challenge
Irix customers often use their lenses in extremely difficult conditions. Therefore, the construction of the Irix 30mm f/1.4 lens had to meet their needs. Only the best materials were used. The guarantee of operation in all conditions is ensured by a system of seals located in key places of the lens, and rear focusing – thanks to which the lens does not change its dimensions while focusing. These properties allow not only to work in difficult conditions, but also guarantee the cleanliness of the mirror chamber and the sensor of the camera you are using.
Available mounts
The Irix 30mm f / 1.4 lens will be available with Nikon F, Canon EF and Pentax K mounts.
Sigma 30mm f/1.4 or Canon EF-M 32mm f/1.4? Do you own a Canon EOS M mirrorless camera and are you looking for a fast prime lens to use with it? Bear with us.
[…] if you own an EF-M mount camera, which lens is the better buy? Which lens produces the best color? Which lens performs best in low light? Which lens is sharper?
Another Canon patent for an optical formula that appears to point to a full-frame mirrorless camera, a 30mm F2.8 DO lens. “DO” stays for diffractive optics. I tell you folks, Canon’s full-frame mirrorless camera is coming!
Patent Publication No. 2016-102851
Published 2016.6.2
Filing date 2014.11.27
Example
Zoom ratio 1.00
Focal length 31.35
F-number 2.86
Angle of view 34.61
Image height 21.64
Overall length of the lens 85.29
BF 29.99
Canon patent
Positive ShiboTadashi
Diffractive optical element (the second group of aperture stop image side)
Correct axial chromatic aberration and lateral chromatic aberration of the near-infrared light
[0001] The present invention relates to a magnification chromatic aberration correction of the imaging optical system used in a near infrared region from the visible region is suitable especially monitoring optical system.
Photography Blog reviewed the Sigma 30mm f/1.4 DC HSM “Art” lens (price & specs) for full-frame APS-C DSLRs (45mm on APS-C). While this is one of Sigma’s recent lenses that get one good review after the other, the 30mm doesn’t convince on all fronts. Build quality is au pair with the Sigma 35mm (price & specs) and 18-35mm f/1.8 (price & specs) lenses. The Sigma 30mm appears to suffer from chromatic aberrations and is not fully sharp in the edges (you have to stop down to f/4 for good results). However, still a great lens at a competing price ($499).
The Sigma 30mm F1.4 DC A lens […] offers acceptable sharpness wide-open at f/1.4 […], excellent build quality, lovely bokeh and fast and quiet auto-focusing, all at a surprisingly affordable price.
The Sigma 30mm F1.4 DC A is tack-sharp in the centre from f/1.8 onwards, although you need to stop down to f/4 to get acceptable results at the edges of the frame. Disappointingly the lens does suffer from serious chromatic aberrations when shooting wide-open, along with obvious vignetting and some barrel distortion too.
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