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Repair guides and support for the EOS 70D, a DSLR camera released by Canon in 2013. This camera can be identified by the model number DS126411.

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How do I clear or brighten the optical viewfinder?

My Canon EOS 70D has a dim optical viewfinder. It is so dim that the exposure metering in the viewfinder overexposes by nearly three stops. I can compensate with exposure compensation, but the optical viewfinder is still dim. I would rather fix the problem than patch it over.

I have reset all of the camera’s settings and updated to the 1.1.3 firmware. The battery is fresh.

Nothing in the optical viewfinder looks or sounds loose. Both mirrors in the mirror box are present and unobstructed—nothing there looks or sounds loose. The focusing screen looks correct and properly seated. Nothing looks out of place when looking through the optical viewfinder to compose a shot.

Each metering mode produces the same overexposure.

Live View works fine. The same lens, with the same focusing distance and the same aperture produces correctly exposed images. There does not appear to be any problem with the lens. There does not appear to be any problem with the main sensor.

It looks like the problem is entirely inside the optical viewfinder.

I am wondering whether a focusing screen from another model of camera could have been put inside, since only the focusing screen and the mirrors affect how much light gets bounced up into the viewfinder.

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Hi

There is a difference in how a dSLR camera meters. In live-view, the actual camera sensor is used for metering, while outside the live-view, a separate metering sensor is used. Please see attached image. The location of the components might be different for your camera, but the exact same principle applies.

When not in live live, light enters the lens and hits the main mirror. From there, some of it passes though (the mirror is not completely opaque) and hits a secondary mirror and then the phase detect autofocus sensor. What gets reflected by the main mirror hits the pentaprism which in turn directs it to the optical view finder and the metering sensor.

Below the pentaprism there is a tiny display. This is used to provide the info you see in the viewfinder. The light needs to pass though this transmissive display too.

This is the reason why the viewfinder is dark when there is no battery in the camera body (even if the camera is turned off, power is still delivered to this tiny display).

If this display is faulty then exactly what you mentioned happens. The OVF is darker and, because less light hits the matering sensor, the metering will be off as well.

Cheers!

Bogdan

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Peter DiGiovanni wird auf ewig dankbar sein.
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