Archive for: apodization

Patent – EF 135 f/2.8 & 180 f/3.5 with Apodization Filter

New lens patents
A new patent showing two lenses, the 135 f/2.8 and 180 f/3.5 has appeared. The interesting part of these patents is something called a apodization filter on the lenses. This improves the bokeh performance of the lenses.

EF 135 f/2.8

Could either of these lens patents translate into a new 135 f/2L or 180 f/3.5L Macro? Only time will tell.

Read more after the break…

Patent Publication No. 2012-128151

  • 2012.7.5 Release Date
  • 2010.12.15 filing date

Example 1

  • 137.2mm – f = 135.0 focal length
  • Fno 2.83 -. 3.90
  • 9.1 deg half each painting.
  • Image height 21.60mm
  • 186.7mm – 150.0 full-length lens
  • BF 47.4 – 80.7mm
  • Lens Construction 10 elements in 7 groups sheet
  • 1 UD glass sheet
  • 0.25 times the maximum magnification ratio

Example 6

  • 179.1mm – f = 180.0 focal length
  • Fno 3.50 -. 4.00
  • 6.9 deg half each painting.
  • Image height 21.60mm
  • 218.0mm – 199.8 full-length lens
  • BF 70.0 – 89.8mm
  • Lens Construction 11 elements in 7 groups sheet
  • 1 UD glass sheet
  • 0.11 times the maximum magnification ratio

Appearance of (Bokeh) is important out of focus

Apodization filter

  • The periphery of the filter transmittance is reduced
  • Added to the luminous flux intensity distribution
  • Bokeh is beautiful and the outline of the

Apodization element variable

  • If the liquid of same refractive index as the shape of the interface, no variation occurs in aberration
  • To be the same refractive power of the two liquids, the Abbe number is difficult

Canon ‘s patented

  • Variable element shape
  • Voltage is applied, changing the shape of the interface
  • Obtain the effect of apodization
  • Varying refractive power, the Abbe number
  • To reduce the time variable aberrations of shape
  • By a twist of the material performed, to optimize the absorption coefficient, to suppress the generation of aberration to moderate the curvature of the interface
  • To reverse the two materials (such as liquid), the amount of chromatic aberration, do the negation
  • Suppress the two materials (such as liquid), refractive index, the difference between the Abbe number
  • The entire feeding (with floating)
Source: [EG]
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