At 11:24 28/12/00 -0500, Lee Hiers wrote:
>How do the brighter screens (with split-image circle and/or
>microprisms) affect metering? Autofocus? Do the focus points show
>up on the new screens? At what f-ratio do the split-images start
>blacking out...are they usable with slower zooms?
No screen affects AF(AF sensor is in the mirror box, below the mirror,
while screens are above the mirror). A few metering modes are affected,
but usually there are instructions for exposure compensation.
For the EOS-A2 (EOS-5) the points need to be made on the screen
to be visible. For the EOS-3, EOS-1n, EOS-1v, all screens have the
points.
According to Popular Photography they start to black out as other
split images, about f4.5-6.7.
>I glanced at the Beattie site and their screens are apparently
>Fresnel screens...how are they to focus on?
Search more on the archives:
http://www.listquest.com/goto/canoneos
Rodrigo Gimenez
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