[Patent] Canon 135mm f/2.8 and a 180mm f/3.5 Using An Apodization Filter
135mm f/2.8
180mm f/3.5
Japanese site Egami (machine translated) spotted another patent filed by Canon. This time it is about a 135mm f/2.8 and a 180mm f/3.5 lens. The news are an apodization filter that should help provide a more pleasant bokeh.
- 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
- (Bokeh) out of focus look of the important
- 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)
- Variable element shape
Sky
11 months ago |Oh hell! Sony will loose one of it’s most stunning and unique lenses! That would be bad for them.
Right now there isn’t anything that can compete even closely with bokeh 14mm STF gives – and at the same time it’s stunningly sharp lens, one of the sharpest on a market.
Interesting fact though is that it seems like Canon made a dslr-sized liquid lens that will probably allow people to turn-off the apodization effect. This could be a real technological breakthrough if actually released! If done well this tech could begin a new era of DSLR lens designs. Both Nikon and Sony will be in a huge trouble!
Sky
11 months ago |*135mm STF (lol, weird typo)
Matt
11 months ago |I don’t think they will ‘loose’ their lens, more they will loose being the only maker on the market with one. The 135mm STF will remain a stunning lens.
Kevin
11 months ago |hmmm wondering how it will compare to the nikkor 135mm f2 DC…
Matt
11 months ago |If it is anything like the Sony version, it will probably be much better than the DC’s… Not that they are a bad lens or anything.