Archive for: patents

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

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

15 Comments

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

8 Comments

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

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


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

35 Comments

Cool Tamron Patent

Cool Tamron Patent

I know, I said “cool” and Tamron in the same sentence. It’s true though.

Want to IS/VC your lenses? Just add this converter!

  • Applications from Tamron
  • Patent Publication No. 2001-33692, 2001-33693, 2001-116994
  • Actuator and a shake correction
  • Power the camera from the supply, or battery use
  • With ON-OFF switch

Google Translated Link

cr

7 Comments