A meter math question

for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?

thanks.

Steven Woody escribió:
for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?

thanks.


The same difference between a 12% reflective surface and a 25% one. How
the refletiveness rate is defined ?.

On Apr 10, 3:41 pm, Àngel Català wrote:
Steven Woody escribió:

for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?

thanks.

The same difference between a 12% reflective surface and a 25% one. How
the refletiveness rate is defined ?.

i think the refletiveness of n% means n units of light will be
reflected back when it received 100 units of light. am i right? so i
think your answer for my question is 'one stop', are you?

Steven Woody escribió:
On Apr 10, 3:41 pm, Àngel Català wrote:
Steven Woody escribió:

for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?
thanks.
The same difference between a 12% reflective surface and a 25% one. How
the refletiveness rate is defined ?.

i think the refletiveness of n% means n units of light will be
reflected back when it received 100 units of light. am i right? so i
think your answer for my question is 'one stop', are you?



Hi Steven,

I don't really answered your question because I added a new question.
Maybe what you say it's true, but I can't assure that reflectivennes (I
don't know if this is a right word, sorry) be a linear unit. If it was a
linear unit, so 25%:12% is a 2:1 ratio. If the relationship is not
linear then we can not assure this statement and then we can not say
that there is one stop of difference.

Cheers.

On 4ÔÂ10ÈÕ, ÏÂÎç9ʱ07·Ö, ¨¤ngel Catal¨¤ wrote:
Steven Woody escribi¨®:

On Apr 10, 3:41 pm, ¨¤ngel Catal¨¤ wrote:
Steven Woody escribi¨®:

for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?
thanks.
The same difference between a 12% reflective surface and a 25% one. How
the refletiveness rate is defined ?.

i think the refletiveness of n% means n units of light will be
reflected back when it received 100 units of light. am i right? so i
think your answer for my question is 'one stop', are you?

Hi Steven,

I don't really answered your question because I added a new question.
Maybe what you say it's true, but I can't assure that reflectivennes (I
don't know if this is a right word, sorry) be a linear unit. If it was a
linear unit, so 25%:12% is a 2:1 ratio. If the relationship is not
linear then we can not assure this statement and then we can not say
that there is one stop of difference.

Cheers.

can anyone here give an answer? thanks.

-
woody

"Steven Woody" wrote in message
oups.com...
for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?

thanks.

Using the 12% meter, you'll gain a little shadow, very, very little. Using
the 25% meter, you'll gain a little more highlite detail and lose a little
shadow. That's if every thing else is equal, which it probably isn't.
Bob Hickey

"Steven Woody" wrote in message
oups.com...

for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?

log_2(2) = 1, so your two alternatives are equivalent. The answer to your
question is yes.

On 4ÔÂ11ÈÕ, ÏÂÎç8ʱ02·Ö, "bob hickey" wrote:
"Steven Woody" wrote in message

oups.com... for two reflective meter, one was calibrated on 12% and another was
calibrated on 25%, so how much stops of difference will appear on
their readings? one or log_2(2)?

thanks.

Using the 12% meter, you'll gain a little shadow, very, very little. Using
the 25% meter, you'll gain a little more highlite detail and lose a little
shadow. That's if every thing else is equal, which it probably isn't.
Bob Hickey

but i think the 25% meter will direct me using more exposure than what
12% shows me.