Julian, I think Bob is right.
I tried it with a different light source and it was fine.
I was testing in my office the first time, with a grey paper in front of my
LCD screen. Well, the results were odd, to say the least. I then tried it at
home with two different bodies and it worked OK, I mean the meter was
acurate enough. As to paritial metering, it is true that AE lock is
activated, but only for 4 seconds. I do not switch extension tube in this
time :))...
So I think we've solved my puzzle. Now I know for sure (not just from
theory) that my underxposed slides are due to the nature of Evaluative
metering. As someone noted.
Evaluative metering is just a fairy tale when using extension tubes.
Sometimes that is true, sometimes it is not. Depending on the amount of
white subjects in the frame, I guess.
Best regards,
Miha.
> -----Original Message-----
> > [EMAIL PROTECTED] wrote:
> > mmmm
> > on my computer screen the 1n seems to pick random values over a 5 stop
> > range ... must be the refresh rate or sommat.
>
> Oops, I should have mentioned that this works best with a long persistence
> display, such as the LCD display from a laptop, or a flat-panel display.
>
> If your camera is being affected by screen refresh, you can still use this
> method. Set your lens to manual focus, and your camera to AI-SERVO (SPORTS
> mode if you use a REBEL) to enable continuous metering, the hold
> the shutter
> button halfway with the lens right up to the screen. Take the HIGHEST
> READING, and ignore the rest.
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