Download Our Android Appthenewcamera-app
NEW CAMERA LINKS
NEWS News about new camera
Hot at New Camera Hot Picks by New Camera

Camera Rumors List of all latest Camera Rumors on Web.
Canon Rumors Latest Canon Rumors.
Nikon Rumors Latest Nikon Rumors.
Sony Rumors Latest Sony Rumors.

Sample Images Click here to see New Camera Sample Images.
Sample Video Click here to see New Camera Sample Video.
Firmware Update

Canon Patent - DOE Lens Extender EF2x

Canon-lens-extender-patent-
Canon filed a new patent for a new Lens Extender EF2x that employs DOE ( possibly enhanced diffractive optical element ) that minimizes Spherical aberration, astigmatism, other distortion and chromatic aberration caused by magnification of the lens extender.

Lens Patent Details

Explanation and self-interpretation of the patent literature

Patent Publication No. 2014-145870

Published 2014.8.14

Filing date 2013.1.29

Example 1

  • Focal length -109.09mm
  • Magnification 2.00x
  • Lens configuration 4 group nine
  • Diffractive surface 1 surface (the first group)

Master lens

  • Focal length f = 293.76mm
  • Fno. 2.91
  • Half angle of ω = 4.21 °
  • Image height Y = 21.64mm
  • Lens length 275.41mm
  • BF 53.79mm
  • Lens configuration 11 group 15 sheets
  • Protective glass 1
  • Rear filter 1
  • UD 2
  • Fluorite 1

Canon patent of

  • The most the joint surface on the object side of the cemented lens I to the diffraction plane
  • This arrangement can suppress the flare

via-egami

1 comment to Canon Patent – Lens Extender EF2x DOE

Leave a Reply

 

 

 

You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>