Henry Posner/B&H Photo-Video wrote:
>
> At 11:41 AM 04/21/2001, you wrote:
> >I am probably not describing it very well, but there was an article in
> >Pop photo in (around) 1994 about this, and I checked it out between my
> >grid screen and the standard eos-3 screen and sure enough, when focus
> >was perfect, it was much easier to see.
>
> The human eye relies on contrast to confirm sharpness, or focus. Too many
> brighter screens offer their additional brightness with less contrast,
> making accurate focusing more difficult.
> --
> regards,
> Henry Posner
A Pentax marketing rep. (a close personal friend) told me that a Pentax
engineer told him a few years ago that they could make the focusing
screen much brighter but as you increase brightness you decrease
contrast. It's all a compromise. Brighter Screen/Lower Contrast or
Dimmer Screen/Higher Contrast. He said that most people associate
higher brightness as being better but the camera prefers higher contrast
(especially for focusing). Maybe some day there will be new technology
that will enable the best of both worlds.
Ray Amos
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