As others have mentioned, the display resolution is also a problem.
Eventually, these shortcomings will get fixed and viable ELVF's will come to
the market. They'll eventually be almost as good as an optical, TTL finder and
eliminate the need for any swinging mirrors. But that time may be 10-20 years
away.
>
>As far as digital viewfinders is concerned--the biggest problem
>remains with delay. There will always be a processing delay
>with CCD to digital display. An optical viewfinder shows
>"real-time". The manufacturers will eventually get around that
>by actually buffering images in memory and allowing an
>adjustable user-delay. In otherwords, if there is a 150ms delay
>between input and display output, the when you press the shutter
>it will store the image taken from the CCD 150ms earlier. This
>would only function in "sports" mode where timing is of essence
>and shutter speeds are high.
>
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