Fast lenses, and High ISO

Started 5 months ago | Discussions thread
EinsteinsGhost
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Re: "the light"?
In reply to bobn2, 5 months ago

bobn2 wrote:

EinsteinsGhost wrote:

Great Bustard wrote:

EinsteinsGhost wrote:

Great Bustard wrote:

Albert Silver wrote:

tko wrote:

Remember that F4.0 is considered kind of slow on FF, but is equal to F2.0 on M43rds, which is considered "fast."

That's not entirely accurate. You are describing the depth of field equivalence, from one sensor to the next, not the light. f/2 on a m43rds may have the depth of field of f/4 on a full-frame, but the light will still be f/2.

What do you mean by "the light will still be f/2"? For a given scene luminance, shutter speed, and lens transmission, the density of light (exposure) projected on the sensor will be the same regardless of format, but not the total amount of light projected on the sensor.

Total light does not matter for correct exposure. It does not change the time value for which an exposure is made for a specific aperture value.

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, any competent photographer would use f/5.6, 1/100 and ISO 400 on ANY format.

Would a competent photographer always use f/5.6, 1/100 and ISO 400 then?

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Bob

No. The choice depends on scene. We're talking about a comparison of exposure here (don't deflect). And, a competent photographer would know that f/5.6, 1/100 at ISO 400 indicates a set of exposure parameters that is not bound by format.

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