Indeed, usually focus screens are a tradeoff of brightness vs. steepness of
parabola of focus. The brighter they are, the less snap they have. The
dimmer screens often have a steeper parabola of focus = more snap.
As long as you are using fast(ish) lenses, the dimmer screens are easier to
use for manual focus. In the world of 1-series EOS, this usually means
replacing the stock EC-IV screen with the EC-S. EC-S is dimmer, but has
more snap. As long as lens is faster than f/5.6, it's not a big deal as far
as manual focusing.
On 12/1/11 6:16 AM, "olympus-request@xxxxxxxxxxxxxxxxx"
<olympus-request@xxxxxxxxxxxxxxxxx> wrote:
>
> As I understand it from Rachel at Katzeye the diffusion profile of the
> matte surface can provide for
> better "focus contrast." Any treatment that improves brightness will
> impair this feature to some degree.
> It appears to be a zero sum game. The 1-series screens should be
> superior to focus for very fast lenses.
> I "think" the 2-13 is OK to accurately focus at f1.4 on the 50mm but
> never did any extensive testing comparing it to the 1-series screen---
> never could find any data in the archives. Bokeh judgment ability seems
> better on the 1-series per AG.
--
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