Hybrid DSLR- would this work?

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Erty

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Would this work to make a hybrid DSLR?

Modify one of the surfaces on the pentaprism/pentamirror so that it allows light from behind it to transmit through to the user's eye. Then put a evf display screen behind the mirror/prism so that the light from it is superimposed on the optical image. It won't impact what the sensor sees because of the mirror. In liveview the mirror is up but the evf can display what the sensor sees and it can be seen through the optical view finder rather than the back screen.

There is no such thing as a free lunch so the optical viewfinder would be a bit darker than a normal pentaprism. If it reflects 70% of the light it will be half a stop darker and you would have to make the evf 3 times brighter than normal to get through the mirroring on the pentaprism.

If the evf is going to interfere with the optical focusing and exposure elements it should be possible to make it out of phase with what they do. Similarly if stray light is going to to do things to the sensor in liveview, pulse the evf out of phase with the sensor. Your eyes don't care if the photons from an evf come in pulses.

You could put whatever you like on the evf. A histogram, setting information, whatever, and see this in normal optical viewing. In liveview it becomes a normal evf and shows the picture you would normally see on the back screen.

This is just for fun, no one is going to make one in the current market.
 
I think the bug in this system was the physical time it takes for the mirror to rise and fall . total mirrorless has in the intervening years since SLT overcome this with lots of M/L cameras now giving blackout free shooting if set up correctly
 
I think........

Place a transparent LCD under the pentaprism/pentamirror that could show data like the histogram etc in the OVF lightpath. Though you would need the sensor readout to show the histogram that requires the dSLR mirror to be up.

However, you could go the whole hog and resurrect the Canon RT with its Pellicle fixed mirror..... negating the mirror movement.

Or just go more economically by using mirror less ;)
 
The Fuji X-Pro has a hybrid VF so presumably all the technology exists to create a beast as suggested. However, EVFs are now so good that hybrid types are probably not needed.
 
Box Brownie said:
However, you could go the whole hog and resurrect the Canon RT with its Pellicle fixed mirror..... negating the mirror movement.
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I don't know about the RT but I did put a couple of rolls through the original Pelix.

It was OK in good light but once the level dropped, it became all too obvious why the Pelix was always shown in adverts with the f1.2 lens fitted. I'm surprised that Canon didn't think to redesign the f0.95 to work with the reflexes, if only to sell it with the Pelix. :naughty:
 
Nod said:
The Fuji X-Pro has a hybrid VF so presumably all the technology exists to create a beast as suggested. However, EVFs are now so good that hybrid types are probably not needed.
Click to expand...
The Fuji hybrid viewfinder does without the mirror/pentaprism part though.
 
The see through EVF bit would still work in a DSLR though.
 
Nikon cameras have a Live View (I presume others do too) which works by locking up the mirror, I've often wondered if, when the mirror goes up, an EVF could pop up in the existing space occupied by the OVF and use the information that, at present, goes to the screen on the back of the camera. The X100V uses a system that swaps OVF and EVF with the push of a button; best of both worlds in IMHO and would have saved developing a whole new camera system, but what do I know.
 
Box Brownie said:
I think........

Place a transparent LCD under the pentaprism/pentamirror that could show data like the histogram etc in the OVF lightpath. Though you would need the sensor readout to show the histogram that requires the dSLR mirror to be up.

However, you could go the whole hog and resurrect the Canon RT with its Pellicle fixed mirror..... negating the mirror movement.

Or just go more economically by using mirror less ;)
Click to expand...
If the manufacturers had put a simple histogram on the screen, I would have loved it.
 
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