Why Exposing to the Right (ETTR) is BAD!

Started Mar 30, 2013 | Discussions thread
Barrie Davis
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Re: Why Exposing to the Right (ETTR) is BAD!
In reply to schmegg, Apr 1, 2013

schmegg wrote:

Barrie Davis wrote:

mike703 wrote:

apaflo wrote:

Barrie Davis wrote:

What puzzles me (actually, I am completely mystified) is why people seem incapable of associating exposing to the right with the consequent loss of film speed  (using an effectively lower ISO). I have had long ping-pong type exchanges in these forums with posters who just could NOT accept that THAT was what was happened. Quoting the actual shutter speeds and apertures USED at them just didn't help, because they didn't associate THOSE with any particular ISOs, either, it seems.

Why is that, do you think?

Because what you just said doesn't make any sense at all???

Sure it does; it's completely clear.  If you have a scene which averages mid-grey and has a histogram in the middle of the range when correctly exposed, and then you ETTR, you are using a longer exposure to get more light hitting the sensor (as much as you can without clipping highlights) and reduce noise.  Which has exactly the same effect as reducing the ISO.

Quite so.

Sure. That's not exactly what Baz said though.

Yes it is! Mike's was different form of words, to expand the point, but with same meaning.

Furthermore, if you cannot SEE that it is the same meaning, it becomes obvious why there is so much difficulty in your understanding the point itself...(shrugs)

Or maybe it is - but he's too keen to fob me off and say I have no idea rather than try to explain himself better.

I already explained that I have found people who don't understand this extremely basic principle for themselves, tend not to understand even when it IS explained. For this reason I now stop trying at the first sign of dispute.

Of course, this doesn't help ME to understand WHY it is that people have so much trouble understanding ... [???]

.... but I guess I'll have to live with that until people such as yourself do some explaining..

.... eh?

The question again?

"Why do (some) people have trouble understanding that increasing exposure, in order to effect ETTR, is precisely the same photographic operation as using a lower ISO."

This is even more of a puzzle considering that the effects are exactly the same, namely...(a) Longer shutter speed or lower f/number required. (b) Somewhat lower noise levels attained. I'd have thought that would have been a massive clue!

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Regards,
Baz
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"Ahh... But the thing is, these guys were no ORDINARY time travellers!"

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