NiSi to announce a new 250mm f/5.6 lens for Canon R and EF mount


NiSi will soon announce a new 250mm f/5.6 lens for Canon R and EF mount (NiSi lenses are sold at Amazon and B&H Photo). Here are the details:

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Canon RF33mm f/1.8 APS-C and Canon RF24mm f/2.8 Full Frame Patents Found


Canon patents are being found pretty frequently with the most recent being Canon RF33mm f/1.8 APS-C and Canon RF24mm f/2.8 Full Frame patents.

overview

  • [Publication number] P2024082112
  • [Release date] 2024-06-19
  • [Title of Invention] Optical system and imaging device having the same
  • [Application date] 2022-12-07
  • [Applicant]
    [Identification number] 000001007
    [Name or company name] Canon Inc.
  • An optical system that is small, lightweight, and has high optical performance is provided.
  • [Background Art]
    [0002]
    With the miniaturization and high pixel count of image sensors, optical systems used in imaging devices are required to be small and have high optical performance. In order to satisfy these requirements, Patent Document 1 proposes an optical system consisting of a first lens with positive refractive power, a second lens with negative refractive power, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side to the image side. The lens surface on the object side of the first lens is convex near the optical axis. The lens surface on the image side of the second lens is concave near the optical axis. The lens surface on the object side of the third lens is convex near the optical axis. The lens surface on the image side of the fourth lens is convex near the optical axis. The lens surface on the object side of the fifth lens is convex near the optical axis. The lens surface on the image side of the sixth lens is concave near the optical axis.
  • [0004]
    In order to reduce the overall length of an optical system, it is effective to adopt a telephoto type power arrangement and strengthen the positive refractive power on the object side and the negative refractive power on the image side. However, when the power arrangement of a telephoto type is strengthened, a large pincushion distortion occurs, making it difficult to simultaneously correct distortion and curvature of field with a limited number of lenses. In addition, when the power arrangement of a telephoto type is strengthened, the back focus becomes shorter and the exit angle of the off-axis light beam becomes larger.
  • [0005]
    The optical system described in Patent Document 1 employs a telephoto power arrangement to reduce the overall length, and uses multiple aspheric lenses to correct distortion and curvature of field, but the Petzval sum of the entire system is large and the exit angle of the off-axis light beam is also large. Therefore, when attempting to apply the optical system described in Patent Document 1 to an imaging device with a large image sensor, the correction of curvature of field and the reduction in peripheral light amount become issues.
  • The present
    invention provides an optical system that is small, lightweight, and has high optical performance.
  • In the optical system L0 of each embodiment, the final lens Lp is
    preferably made of plastic. The diameter of the final lens Lp is generally large, and using glass as the material for the final lens Lp is not preferable because the lens weight becomes heavy.


Example 1

  • Focal length: 28.50
  • F-number: 2.86
  • Half angle of view: 37.20
  • Image height: 21.64
  • Overall length: 42.64
  • Back Focus: 13.25


Example 2

  • Focal length: 28.50
  • F-number: 2.55
  • Half angle of view: 37.20
  • Image height: 21.64
  • Total length: 42.90
  • Back Focus: 12.46


Example 3

  • Focal length: 24.50
  • F-number: 2.88
  • Half angle of view: 41.45
  • Image height: 21.64
  • Total length: 47.90
  • Back Focus: 11.28


Example 4

  • Focal length: 33.08
  • F-number: 1.85
  • Half angle of view: 22.44
  • Image height: 13.66
  • Overall length: 41.00
  • Back Focus: 11.91

via asobinet

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Canon USA Twitter account is hilarious


The Canon USA Twitter account is actually hilarious:

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Canon released EOS Webcam Utility Pro version 2.2.22


Canon released EOS Webcam Utility Pro version 2.2.22 – here is the changelog:

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PP: Voigtlander Nokton 50mm f/1.0 and Voigtlander Nokton 40mm f/1.2 Character Review

Chris and Jordan published their character review video of the Voigtlander Nokton 50mm f/1.0 and Voigtlander Nokton 40mm f/1.2. There is a summary below of their findings.

Canon R5 with Voigtlander 40mm f/1.2 Nokton

  • Full electric connectivity for EXIF
  • Premium manual focus lens
  • Butter smooth focus
  • Nice click stop
  • All metal
  • Nice Depth of field scale
  • A little smaller and lighter than the 50mm
  • 420g or 0.9lbs
  • 58mm filter thread
  • Not much flare to worry about
  • No major ghosting
  • Not great for Sunstars but a little better than the 50mm f/1.0
  • Great bokeh with cats eye specular highlight that are almost petzval
  • Petzval cats eye goes away by f/2 and no soap bubbles or onion rings
  • Can be a little polygonal when you stop down
  • LoCA is pretty bad wide-open
  • Fairly soft wide open with some contrast loss that goes away as you stop down
  • There is vignetting in the corners in addition to it being soft and while it sharpens up by f/2.5 there is still vignetting
  • You can get character and softness out of this lens without a problem
  • Beautiful character that can get razor-sharp and it is well corrected
  • Similar bokeh from both lenses

Voigtlander Nokton 40mm f/1.2:
B&H Photo

Sony a7RV with Voigtlander Nokton 50mm f/1.0

  • Full electric connectivity for EXIF
  • Premium manual focus lens
  • Butter smooth focus
  • Nice click stop
  • All metal
  • Nice Depth of field scale
  • 484g or 1.1lbs
  • 67mm filter thread
  • Not much flare to worry about
  • No major ghosting
  • Not great for sunstars
  • Great bokeh with cats eye specular highlight that are almost petzval
  • Petzval cats eye goes away by f/2 and no soap bubbles or onion rings
  • Slightly worse LoCA than the 40mm which is pretty bad wide-open
  • Fairly soft wide open with very low contrast that goes away as you stop down as soon as f/1.4 and more so at f/2.0
  • There is vignetting in the corners in addition to it being soft and while it sharpens up by f/2 there is still vignetting
  • You can get character and softness out of this lens without a problem
  • Beautiful character that can get razor-sharp and it is well corrected
  • Similar bokeh from both lenses

Voigtlander Nokton 50mm f/1.0:
B&H Photo / Amazon

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WANDRD Bags Are Currently On Sale


WANDRD Bags have become my favorite bags for carrying my equipment around and they are currently on sale at B&H Photo. We have covered the WANDRD PRVKE here on FujiAddict and WANDRD ROAM Sling here. I have owned both bags for years and they have held up very well compared to other bags I own so I still highly recommend them.

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