Exposure Basics, lesson three?

Started Mar 18, 2013 | Discussions thread
Najinsky Veteran Member • Posts: 5,739
Re: Quick correction.

Macx wrote:

I have a great respect for the problems you must face teaching beginners who come with cameras that might not even have basic aperture or shutter controls, etc. But why the bloody triangle? It really doesn't make sense. The only thing triangular about these three concepts is that there are three of them.

Yes it's as simple is that. Three settings that encompass the capture. A common way of showing something encompassed by three sides is a triangle. I didn't invent it, it's been around a long time and I happy to use it to convey the three related settings. It works for me, and it worked on the course.

If other people want to present it differently that's fine. But those graphs are attempting to show something else, the equivalence in exposure terms of different combinations of settings. That's fine too, if that's how you like to look at stuff.

But for the equivalent exposures, I simply show some photos, some of them with problems caused by the shutter speed too slow and some with the aperture too wide. Therefore including the notion that the scene may limit the range of equivalent exposures available to us. Then they practice it and see for themselves.


From http://photo.stackexchange.com/questions/6598/what-is-the-exposure-triangle

The above is from What is the exposure triangle? Where a guy laments over the concept. As he writes: "If you attach any actual meaning to the dimensions of the sides or the angles of the corners, not only is there no relationship to the area or size of the triangle, many settings yield impossible triangles even though they're perfectly valid exposure settings."

And that is just without going into the whole ISO thing, and what we meter or expose for. He then tries to jam in ISO too, but that discussion is already ongoing, so we'll let that slide for now. The above is a better way of visualising reciprocity, in my opinion, than the triangle.

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