On Fri, 5 Aug 2005, Tom Reese wrote:
Kostas Kavoussanakis wrote:
- How many stops between 18% gray and pure white? Is it 2, as per the
rule of thumb?
It depends on the medium. Slide film is 2 1/2 stops from medium gray to
textureless white. It's probably more than that for print film. I have no
idea what the dynamic range is in digital sensors.
Thanks for this, I did not know. I use mostly 400ISO, consumer-grade,
colour negative (Superia 400 or Konica Centuria Super 400). I will see
what I can get from their specs.
- Assume a backlit (setting sun, still white light) white flower. How
do you meter that sod?
I do it the same way. Spot meter the flower from the shooting side and expose
1 1/2 to 2 stops above medium tone (for slide film).
The palm method does not work, I don't think,
because the white flower-petals are translucent but the palm isn't.
If you get the palm to face the source of light, one's metering
device/own body shadows it. Or can you take an accurate enough
reading even if spot metering the palm from an angle?
I don't think reflective metering would work with a backlit transluscent
flower.
OK, let me pimp my ignorance around: by spot-metering I was referring
to the function available in the -5n/-1p. Is that what you mean by
spot-metering too? Is there such a thing as incident spot metering?
Kostas
