On 10 May 2001, at 3:47, Hugo Kok wrote:
>
> Hi,
>
> Having heard/read about differences in metering properties of
> respective focusing screens, I would like to ask if anybody can answer
> this question: what is exactly the exposure compensation to be used
> when inserting a LX-focusing screen into a MX-camera?
>
> And, if anybody has experience in above mentioned screen exchange: are
> there still other differences that makes my trick less likely to work
> out properly?
>
> Would be greatly thankfull for your comments.
Hi Hugo,
The newer LX screens are brighter than the MX screens and since the
metering cells are placed after the screen in the MX the meter will read
higher than the actual scene would meter externally. In the case of the LX
since the metering type is off the film/shutter curtain/mirror the brightness of
the screen plays no part in the meter sensitivity.
The each screen will have a different effect on the meter of the MX therefore
you should calibrate per screen. The task is not difficult, meter a blank
constantly illuminated wall full screen with the old screen and note the meter
value, fit the new screen, meter the same wall and adjust the ISO dial until
the same meter value is shown, the difference in ISO settings is the
compensation value.
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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