Stump the next person!

[unpopular]

if you know the answer, answer i and ask the next person a question. If you think the person is wrong, discuss. Need not be photo related. I'll start with a relatively easy question...

what is the functional limitation of the f-ratio in prediction of exposure?

 

[Tuffythepug]

Heck, I'm not even sure I understand the dang question but I'm going to say "the ISO setting"

 

[unpopular]

Hint: what does f-ratio mean, and what doesn't it measure?

 

[jwbryson1]

:crazy:

 

[christop]

f-ratio measures only the size of the aperture, not how much light is transmitted to the sensor through the lens. Lens elements do not have 100% transmission. Some light is absorbed.

(I hope I got the right answer.)


What is responsible for the flattening or the bulging nose/forehead effect in portraits?

 

[unpopular]

yep. that's what I was looking for

Objects' magnification is relative to working distance, these features being closer to the lens magnify at a greater degree than features further back.

if that satisfies you, let's turn it up a notch...

If color temperature is defined as the spectral emission of incandescent illumination at a given temperature, why is it that the radiant temperature of a ceramic heating element or lamp filament not correspond exactly to it's color temperature?

 

[rexbobcat]

Because physics

 

[christop]

Yep, that was the answer I was looking for.

A ceramic heating element and lamp filament are not black bodies.

 

[unpopular]

^^ damn! looks like this thread is just going to be us! LOL

you're up christop