Micro four thirds - does the crop factor apply to MFT lenses as well?

Started Dec 29, 2012 | Questions thread
Detail Man
Detail Man Forum Pro • Posts: 16,688
Re: Super duper and quick summaries

richarddd wrote:

Great Bustard wrote:

Explaining the issues with f/2 = f/2 = f/2 seems worthwhile. Arguing about definitions seems much less so - just make sure people understand what you are saying.

The thing is, one cannot explain what "f/2 = f/2 = f/2" is meaningless if people do not understand what exposure actually is. So, since it's a "lost cause" to get people to distinguish between the terms "exposure" and "brightness", each and every time, it requires yet another long discussion, like the one in this thread, explaining, from the beginning, what exposure (and total light) is, what its role is in the visual properties of the final photo, and what the role of the ISO setting on the camera actually does.

I don't believe it's a lost cause getting people to distinguish between density of light on the sensor and brightness of the resulting image. They often have a problem if you just say "exposure." The cure is not to insist they are wrong about the meaning of "exposure" (as it provokes pointless arguments), it's to say that you're talking about density of light.

If people can't understand a short explanation of what you mean by "exposure" you could do a write up, post it somewhere and link to it, perhaps with super-duper quick, super quick and quick summaries

Oddly enough, and rather notably, other people have already done just that:

Radiant (radiometric) Exposure defined: http://en.wikipedia.org/wiki/Exposure_%28photography%29#Photometric_and_radiometric_exposure

Exposure Value (formal defintion): http://en.wikipedia.org/wiki/Exposure_value#Formal_definition

Perhaps there might be less "pointless arguments" in the first place if people read available literature ?

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