Patent: Optical Viewfinder for Mirrorless Camera

Canon Rumors Guy

EOS 1D MK II
Jul 20, 2010
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Canada
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Here’s a strange patent application from Canon, an optical viewfinder adaptor for a mirrorless camera.</p>
<p><strong><a href="https://www.canonnews.com/canon-applies-for-an-optical-viewfinder-patent-for-mirrorless-cameras">Canon News</a> breaks down Japan Patent Application 2018-005126:</strong></p>
<blockquote><p>This adapter would provide the half mirror assembly that would split the optical path between the image sensor and the viewfinder, and allow for simutaneous use of the image sensor and that of the optical viewfinder.</p>


<p>The image sensor would be responsible for AF for one embodiment, the other embodiment has a seperate phase detect AF sensor.</p>
<p>There is a large group of photographers that just don’t like EVF’s and may never like EVF’s, so this could be a solution for them.</p></blockquote>
<p>Me personally? It wasn’t until the Leica Q that I got over my hate of EVFs.</p>
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Canoneer

EOS T7i
Sep 6, 2017
73
3
It's an interesting concept. It may not be practical for a mirrorless system, as really the whole point is to cut down on bulk. But it would be useful way to retain the EF mount lenses with their flange distance requirement in a mirrorless body. Weather sealing might be an issue.
 

Zeidora

EOS 7D MK II
Feb 15, 2015
668
10
And you get a dark view finder (-1EV) plus more noisy images (-1EV). DOA IMHO.
 

rrcphoto

EOS 5D MK IV
Jun 20, 2013
2,505
147
Zeidora said:
And you get a dark view finder (-1EV) plus more noisy images (-1EV). DOA IMHO.
no you don't. the second embodiment is the same as a current DSLR.
 

Zeidora

EOS 7D MK II
Feb 15, 2015
668
10
rrcphoto said:
Zeidora said:
And you get a dark view finder (-1EV) plus more noisy images (-1EV). DOA IMHO.
no you don't. the second embodiment is the same as a current DSLR.
Not quite. Fix mirror vs. movable mirror. That's the 50% difference in light levels in each pathways. Think camera lucida in microscopes.
 

goldenhusky

EOS RP
Dec 2, 2016
264
51
Sure enough it sounds strange but at the same time it sounds like the AF performance may be better than the mirror less cameras. IMO that is a real advantage over making the OVF lovers happy.
 

masterpix

EOS T7i
Jun 29, 2016
78
43
As I recall, there was a camera, using a semi-transparent mirror that did just that with SLR. for example: http://ylovephoto.com/en/2010/08/27/why-sony-uses-a-semi-transparent-mirror-in-a33a55/ or even Canon did it once http://www.mwclassic.com/product/canon-pellix-ql-35mm-slr-non-moving-semi-transparent-mirror-50mm-f1-8-fl-breechlock-mount-lens-er-case/...

So what is the thing here? is it a SLR with non flipping mirror or mirror-less with mirror?
 

privatebydesign

Would you take advice from a cartoons stuffed toy?
Jan 29, 2011
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masterpix said:
As I recall, there was a camera, using a semi-transparent mirror that did just that with SLR. for example: http://ylovephoto.com/en/2010/08/27/why-sony-uses-a-semi-transparent-mirror-in-a33a55/ or even Canon did it once http://www.mwclassic.com/product/canon-pellix-ql-35mm-slr-non-moving-semi-transparent-mirror-50mm-f1-8-fl-breechlock-mount-lens-er-case/...

So what is the thing here? is it a SLR with non flipping mirror or mirror-less with mirror?
Canon have done it six times in production cameras (of varying quantities). They even made a couple of AF models, the most recent being the 1N-RS in 1994.
 

RGF

How you relate to the issue, is the issue.
Jul 13, 2012
2,816
35
neuroanatomist said:
Zeidora said:
And you get a dark view finder (-1EV) plus more noisy images (-1EV). DOA IMHO.
Only if you accept the limitations of the laws of physics. ;)
Let's impeach these laws. After all, the value of pi was legislated to be 3. Why can't the law of physics be over turned :-\

Would fit in perfectly with our current political system :eek: