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Forum: Pentax News and Rumors
10-05-2018, 06:32 PM
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The back of the prism is already a one-way (kind of a see-through) mirror so no moving mirror is required for this patent (except for the main mirror).
It could but you would lose 1 stop of light.
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Forum: Pentax News and Rumors
10-03-2018, 10:03 PM
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Correct, that's the one to 'make the projected image big enough'. One of the other options uses a prism with a curved face to do the same.
I assume the other options are there to try to cover all the bases and prevent others bypassing the patent.
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Forum: Pentax News and Rumors
10-03-2018, 01:50 AM
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Basically the patent relates to projecting an image within the optical viewfinder either as an overlay or an EVF.
The sections relating to magnification seem to cover the existing lenses between the eyepiece and the prism (3 lens group) and the need to make the projected image big enough.
They actually present three different ways of doing this using different arrangements of mirrors/prisms. I have only shown one in the image above.
And I said the EVF can only be used in live view because otherwise the mirror still covers the sensor.
You could still project a lot more than at present such as menus, info screen, focus points that turn green with focus lock etc etc.
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Forum: Pentax News and Rumors
10-02-2018, 04:09 PM
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This may help some visualise what the patent proposes.
Attachment 425753
The red object we will call a projector, it might be fairly basic like the focus point overlay it replaces or it might be capable of projecting the same image as the rear LCD.
The blue objects are mirrors.
The green object is a lens.
The purple object is a triangular prism.
Note, the only time it could be an EVF is in live view (ie. with the mirror up)
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