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Canon Patented Three More Apodization Prime Lenses – 24mm f/1.4, 35mm f/1.4 and 50mm f/2

Canon Patented Three More Apodization Prime Lenses – 24mm f/1.4, 35mm f/1.4 and 50mm f/2

It has previously been widely reported that Canon patented a lens design for a 135mm f/2 focal length that includes an apodization filter (APD), much like the Sony G Master 100mm f/2.8 lens that was launched just last week. In fact, Canon seems to have taken things more seriously than that and we can exclusively reveal today that they also hold patents for three additional lenses that include apodization (APD) filters: A 50mm f/2 APD, a 35mm f/1.4 APD and a 24mm f/1.4 APD. All of the lenses are EF (full frame) lenses.

An apodization filter is essentially a circular graduated ND filter that sits within the lens and helps to smooth out the transition of bokeh highlights, as well as adding an overall smoothing effect to foreground and background blur. If you aren’t familiar with APD filters, you might want to check out our Knowledge Base article that includes some samples handed out by Sony with their recent APD-equipped lens: What Is an Apodization Filter?

The patents all contain information regarding the transmissivity graduation of the proposed APD filters, such as that seen below.

A Patent document 1 and 2 has disclosed the optical system provided with the apodization filter. In a Patent document 1 and 2, an apodization filter is a transmissivity distribution filter constituted so that a transmitted light amount might decrease as it separates from an optic axis in the direction orthogonal to an optic axis. Intensity distribution can be added in a photographing light bundle, and such an apodization filter enables it to form the good ******** image (blur image).

Unlike some previous APD lenses from other manufacturers like Minolta, Sony and Fuji film, it appears as though Canon’s lenses will incorporate two apodization filters. These are labelled F1 and F2 in the subsequent diagrams below.

Transmissivity distribution filter F1 and F2 are arranged at the photographing optical system 100 of this embodiment. Transmissivity distribution filter F1 is 1st transmissivity distribution filter (j= 1) (first apodization filter) arranged rather than diaphragm SP at the object side (front side). The transmissivity distribution filter F2 is the 2nd transmissivity distribution filter (j= 2) (second apodization filter) arranged rather than diaphragm SP at the image surface IP side (rear side).

Canon 24mm f/1.4 APD Patent

 

  • Focal distance 24.55
  • F number 1.45
  • Field angle 41.39
  • Image height 21.64
  • Whole length of the lens 129.11
  • BF 38.80

Canon 35mm f/1.4 APD Patent

  • Focal distance 34.30
  • F number 1.45
  • Field angle 32.25
  • Image height 21.64
  • Whole-length-of-the-lens 124.29
  • BF 38.65

Canon 50mm f/2 APD Patent

  • Focal distance 50.00
  • F number 2.00
  • Field angle 23.40
  • Image height 21.64
  • Whole length of the lens 75.84
  • BF 36.00

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