Lets take this theoretical construct:
We have a room without a window and only one point light source on the sealing, a lamp with lets say 100 watts.
Lets say my stock is 200 ASA and my stop is 2.8 and I take PIC A
Now I put in a new bulb that is much stronger and my new given f-stop ist 11. I take PIC B
Do both pictures look the same?
They should as we have relatively the same amount of light hidding the negative.
Background of my question:
My teacher told me that pic a and b will never look the same even not on black and white and also my experiene tells me it is like that.
We tried to light a studiobuild room with a light that was approximetely 2pm o clock summer day. We did not reserved enough light so we had to use 3 x 2k and the atmosphere we got was maybe 5pm o'clock in the evening. Of course our eyes can determine very good the ambience situation of the light but why is it not possible to fake this on the stock by f.e. opening the iris a little bit more. Is this just a color temperature problem or are there any effects that the materials reflective curve do change with the amount of light hitting them making it impossible to fake it with different film exposure.
I also read an Interview with a professional DP who answered the question: Why do we still use so powerful lights even in studio though film stock became so good even in high ISO? His answer: Because of quality.
Thank you very much for joining the discussion!
Edited by c_conditt, 02 June 2006 - 07:47 AM.