June 18, 2018, 12:34:23 AM

Author Topic: Patent: Improved Flare Control For DO Elements  (Read 1995 times)

Canon Rumors

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Patent: Improved Flare Control For DO Elements
« on: February 15, 2018, 05:25:46 PM »
A patent showing how to improved flare control with DO elements has appeared. This goes along with some of the recent flare control patents we’ve seen for standard supertelephoto lenses.

This patent notes continued flare improvement for a 70-300 DO lens according to Canon News

From US Patent 20180045975:

An image pickup apparatus for the long wavelength band of 8~14μm uses light (hereinafter, the far referred to as long wavelength infrared region). Therefore, if the diffraction efficiency of the diffractive optical element with respect to a specific diffraction order is low in a part of the far-infrared region, diffracted light having a diffraction order unnecessary for imaging can be generated. This is not preferable because it causes flare.

While we don’t believe we’ll get an EF 60mm f/4 DO IS announcement in 2018, it’s always possible another DO lens could be on the way.

« Last Edit: February 15, 2018, 05:34:30 PM by Canon Rumors »
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Patent: Improved Flare Control For DO Elements
« on: February 15, 2018, 05:25:46 PM »

tron

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Re: Patent: Improved Flare Control For DO Elements
« Reply #1 on: February 15, 2018, 06:07:34 PM »
A <a href="http://pdfaiw.uspto.gov/.aiw?PageNum=0&docid=20180045975">patent showing how to improved flare control with DO elements</a> has appeared. This goes along with some of the recent flare control patents we’ve seen for standard supertelephoto lenses.</p>
<p>This patent notes continued flare improvement for a 70-300 DO lens according to <a href="https://www.canonnews.com/canon-patent-application-for-improved-flare-control-for-do-elements">Canon News</a></p>
<p><strong><a href="http://pdfaiw.uspto.gov/.aiw?PageNum=0&docid=20180045975">From US Patent 20180045975:</a></strong></p>
<blockquote><p>An image pickup apparatus for the long wavelength band of 8~14μm uses light (hereinafter, the far referred to as long wavelength infrared region). Therefore, if the diffraction efficiency of the diffractive optical element with respect to a specific diffraction order is low in a part of the far-infrared region, diffracted light having a diffraction order unnecessary for imaging can be generated. This is not preferable because it causes flare.</p></blockquote>
<p>While we don’t believe we’ll get an EF 60mm f/4 DO IS announcement in 2018, it’s always possible another DO lens could be on the way.</p>
<span id="pty_trigger"></span>
You are right you don't believe you will get an EF 60mm f/4 DO IS announcement in 2018. I am certan that neither Canon does  ;D ;D ;D

Now an EF600 f/4 DO IS is another matter  ;D ;D ;D

Jack Douglas

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Re: Patent: Improved Flare Control For DO Elements
« Reply #2 on: February 15, 2018, 08:39:47 PM »
Well, no one else has a 60, do they.

Jack
1DX2   11-24 F4   24-70 F4   70-200 F2.8 II   300 F2.8 II   1.4X III   2X III   400 DO F4 II 

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Re: Patent: Improved Flare Control For DO Elements
« Reply #3 on: February 15, 2018, 11:09:42 PM »
I skimmed thru the patent, and saw that it covered the use of four different materials, but did not see any reference to a lens design or focal length, except that it applies to a DO lens.

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Re: Patent: Improved Flare Control For DO Elements
« Reply #3 on: February 15, 2018, 11:09:42 PM »