Focal length 35mm equivalent, but not F-stop?

Started Jul 24, 2014 | Discussions thread
Erik Magnuson Forum Pro • Posts: 12,247
Re: Focal length 35mm equivalent, but not F-stop?

Beachcomber Joe wrote:

The total light will decrease but not the light per square mm of area. Since the amount of light falling on a specific area of the sensor remains the same the exposure remains the same.

Why is it so important the numbers for exposure have to match?  Don't you care more about the results than the exact numbers used to get them (cross-format).

A lot of the technobabble you read hear is about total light. Total light can be ignored. What matters from a photographic standpoint is the amount of light per square mm hitting the sensor.

You really would shoot an FF and MFT camera identically?  If you were shooting 35mm and 4x5, would you'd choose the same film and f-stop/shutterspeed?

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