On Aug 25, 2005, at 2:50 PM, Kostas Kavoussanakis wrote:
I asked 3 weeks ago about getting white out of spot metering
something white; I reminder below:
- The rule of thumb says that, in order to get a very snowy
picture to
look white, you add +2 to whatever the (say, CW) meter says.
Will the +2 correction work with a white flower on a macro (ie
mostly white) shot?
Rules of thumb are approximations. It all depends where you want
to place Zone IX ... Zone IX being defined as the brightest part
of the scene that you want to retain detail in.
- How many stops between 18% gray and pure white? Is it 2, as per
the
rule of thumb?
18% reflectance gray is Zone V. So if the flower is to be Zone IX,
it's three stops brighter than Zone V.
And here is the result:
http://www.epcc.ed.ac.uk/~kavousan/Orchid.jpg
Z1-P, Tamron 90/2.8 SP, Superia 400, handheld. Spotmetered on the
petal with EV+2.
Looks great!
Godfrey
