patents « Canon Rumors

New 65 f/2.8 & 180 f/3.5 Macro Patents

65 f/2.8 Macro

Patent Publication No. 2011-191743

2011.9.29 Release Date
Filing date 2010.2.16

Example 8

Focal length f = 65.00mm
Fno 2.90 – 3.05 – 3.96
Half angle of 18.41 °
Image height 21.64
145.08mm Length Lens
Back Focus 38.20 – 47.63 – 37.80mm
Positive and negative lens group of positive and negative 4
Inner Focus + Rear Focus
Group 2, Group 3, Group 4 to move the focus method

180 f/3.5 Macro / 150 f/2.8 Macro / 135 f/2.8 Macro

Patent Publication No. 2011-191743

2011.9.29 Release Date
Filing date 2010.2.16

Example 1

Focal length f = 180.00mm
Fno 3.50 – 4.60 – 5.80
6.85 ° half angle
Image height 21.64
225.02mm Length Lens
Back Focus 64.01mm

Example 4

Focal length f = 150.00mm
Fno 2.80 – 4.00 – 5.00
8.21 ° half angle
Image height 21.64
206.53mm Length Lens
Back Focus 49.00mm

Example 5

Focal length f = 135.00mm
Fno 2.80 – 3.80 – 4.80
9.20 ° half angle
Image height 21.64
205.00mm Length Lens
Back Focus 46.50mm

Four groups of positive and negative lenses accurately

Inner Focus

The combination of convex and concave lens, low dispersion and high dispersion in the most object side lens, chromatic aberration correction

Source [EG]

cr

Canon Patents This Week

New Macros and Tilt Shifts Coming?
Recent patents have shown new Macro and Tilt-Shift lenses. Below I’ve listed them.

Explain a patent
You cannot patent a lens per se, but you can patent an optical formula. I think it’s safe to talk about patents, as many of them have turned into actual consumer products.

Canon 50mm 1:1 f/2.8 Macro

Canon 90mm f/2.8 Tilt Shift

Canon 35mm f/2.8 1:2 Macro

Patent Publication No. 2011-107313
Published 2011.6.2
Filled 2009.11.16

50mm f/2.8 1:1 Macro

Focal distance f=50.20mm
Fno=2.90
Half angle of view 23.32 deg.
Image height 21.64mm
Lens length 84.64mm
Back focus 40.01mm
Macro -0.950x

90mm f/2.8 Tilt Shift

Focal distance f=90.40mm
Fno=2.90
Half angle of view 17.90 deg.
Image height 29.20mm
Lens length 117.18mm
Back focus 65.43mm
Macro -0.480x

35mm f/2.8 1:2 Macroa

Focal distance f=35.20mm
Fno=2.90
Half angle of view 31.58 deg.
Image height 21.64mm
Lens length 102.44mm
Back focus 40.10mm
Macro -0.480x

cr

EF 16-40 f/4L IS [CR1]

A replacement to the 17-40 f/4L?
Apparently a patent for an EF 16-40 f/4L IS will be filed soon and I’m told to keep an eye for it over the next couple of weeks.

CR’s Take
The 17-40 is one of the best values in “L” lenses and is a cash cow for Canon. It does need improvements on the edges and Nikon stabilized their f/4 full frame wide angle. It’s a believable replacement.

cr

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Canon EF 17-40 f/4L $839 @ B&H