Confusions about using Kodak Gray Card

Q1:

I want to calibrate my camera meter using a Kodak gray card.
According to the instruction, I find that I have to use the card
outdoor, but I dont understand why this is nessary. Why I can not use
it indoor if I can guarantee the card dont reflect glare? And, I still
dont understant why I can not use it under a full shade?

Q2:

Kodak ask me to open up 1/2 stop for the meter reading, I think this
is due to that the 12.5% is used as natural reflectance by ANSI. But
I doubt whether the 12.5% is really used by most camera vendors in the
market. (I am using a Nikon F80, any know what the F80's viewpoint
about netural reflectance).

Q3:

For copy work, Kodak suggest me to *close* down 1/2 stop for the gray
card reading. That sounds so weird! What's the reason behind it?


Any help would be appreciated!

--
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Q: How did you get into artificial intelligence?
A: Seemed logical -- I didn't have any real intelligence.

"Steven Woody" wrote...

Q1:
[...]

I strongly recommend you to repost your question to
rec.photo.EQUIPMENT.35mm. This is .marketplace., people
post for sale and want to buy adverts here and are unlikely
to answer your question.

Victor