Fast lenses, and High ISO

Started 3 months ago | Discussions thread
EinsteinsGhost
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Re: You missed the question.
In reply to Great Bustard, 3 months ago

Great Bustard wrote:

EinsteinsGhost wrote:

Great Bustard wrote:

EinsteinsGhost wrote:

Great Bustard wrote:

A competent mFT photographer with an EM10 + 12-40 / 2.8 shoots a scene at 25mm f/5.6 1/100 ISO 400. What settings would result in the "correct exposure" if they had instead been using FF with a 6D + 24-70 / 2.8 VC?

For same exposure...

I didn't ask about the setting for the same exposure -- I asked about the settings that resulted in the "correct exposure".

Tell me what you mean by "correct exposure".

That's what I was hoping you would answer.

...any competent photographer would use f/5.6, 1/100 and ISO 400 on ANY format. This, of course assumes same shooting conditions, transmissive properties of the lens, and metering used in respective cameras.

Why would a competent photographer necessarily use the same exposure with different formats?

Because a competent photographer knows exposure is not dependent on format. It is dependent on: ISO, Aperture and Shutter values for a given scene brightness. That is it.

So, for a given scene luminance, f/2 1/100 ISO 400 and f/4 1/100 ISO 1600 have the same exposure? That's not what you said in another post. You said that the f/4 photo had two stops lower exposure.

No. You're using a lower exposure by 2-stops, and using 2-stops of "sensitivity" increase to overcome it. Why else would you think ISO 1600?

So, in what way does the density of light falling on the sensor matter more than the total amount of light falling on the sensor?

The answer to the "correct exposure" question should make it easier to answer the question immediately above.

Only if you knew what "correct exposure" is. Can you quantify and describe it?

That's what I was asking you. Here, I'll repeat the question:

A competent mFT photographer with an EM10 + 12-40 / 2.8 shoots a scene at 25mm f/5.6 1/100 ISO 400. What settings would result in the "correct exposure" if they had instead been using FF with a 6D + 24-70 / 2.8 VC?

Note that I am asking for the settings for the "correct exposure" (whatever you think makes that exposure "correct" -- that's the reason for the question), not the settings for the same exposure.

Correct exposure in a comparison would entail, same exposure.

Ah -- so if f/2 1/100 ISO 400 on mFT gives the "correct exposure" then f/2 1/100 ISO 400 on FF would also give the "correct exposure"? So, if you used a different exposure on FF, then it would be "incorrect"?

"Correct" or "Incorrect" is your fantasy. I speak of exposure, same or different. In other words, f/2 and 1/100s on FF or m43 or whatever is: Same exposure.

Whether it is correct or incorrect by sensor size, I will let you dwell in that since exposure values are independent of format (something you don't know).

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