What fools a lot of people, Mark, is that the view
through the camera does not "look" twice as bright
when we open up one stop. I,ve had a difficult time
explaining this to people who insist the screen only
looks twice as bright when you open up two stops. They
believe their eyes before they accept the math. John
--- "Mark A. Thalman" <mthalman@xxxxxxxxxxxxx> wrote:
I think this is sort of what I was driving at when I have pooh-poohed
upgrading to the series 2 screens in the past. John Hermanson said, I
believe, that you get a measurable increase in screen brightness of
.6 of an F stop. Thank goodness for John's objectivity. An easy way
then to check whether those of you who have been thinking about it
really need a series 2 screen would be to take your fastest lens on
your OM, stop it down 1/2 F stop from wide open and look through the
viewfinder while pressing in the preview button on the lens. While
looking through the lens let up on the preview button so that the
aperture opens to its widest and note the difference with 1/2 stop
more light. It ain't dramatic. At least not to me.
If brightness is very important then the clear screens with
microprism centers such as 1-5, 1-6, or 1-7 are very bright
subjectively. You just don't get as flexible a viewfinder tool for
most shooting as the 1-13.
Winsor
--
Winsor Crosby
Long Beach, California, USA
mailto:wincros@xxxxxxxxxxx
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