>
> As for Macro, I think an external meter would be a
> royal PITA. Juggling the meter and camera when both
> need to be so close to the subject would be a
> nuisance. And if you're using extension tubes, and
> even some macro lenses, you'd have to manually
> calculate the light loss and adjust the exposure
> accordingly.
> Bob Meyer
With Canon macros you have to make allowance for the pupillary
magnification factor when manually setting exposures (flash or
ambient) or you can be out by a couple of stops: easily. I use a
minolta mini-receptor attachment for this which really is the
business. To avoid complicated math I just calibrated it against the
camera while the camera + bellows + macro lens was looking at a grey
card. Once you have done that ... and plotted it vs bellows
extension, ambient metering is reliable: and independent of subject
colour/reflectivity/size in the frame etc etc.
BobT
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