Why ETTR?

Started 11 months ago | Questions thread
rhlpetrus
Forum ProPosts: 23,497Gear list
Like?
Not ETTR necessarily Re: Why ETTR?
In reply to Ysbrand Galama, 11 months ago

Ysbrand Galama wrote:

Can someone explain to me why I should expose to the right (ETTR) in low light conditions.

Let's take an example to explain what I do not understand. Let's say my camera measures F2.0, 1/50th and ISO 800 (no over- or under exposure). I want to ETTR so I set my camera to F2.0, 1/50th and ISO 1600.

Why would ISO 1600 give better results than ISO 800? I maybe exposing to the right, but also the sensor noise increases, negating the effect.

I must be missing something.

Y.

Using same SS and perture will produce same exposure on sensor, 1600 will only cause camera to amplify result before writing to RAW, if that's what it does (some do not change RAW). Why do you think increasing gain will mske it a "ETTR" exposure? Depending on the metering used it could produce a clipped RAW file. You need to study your camera's spotmeter and see how many EVs you have above centre calibration and clipping point in RAW. For that you need to do some testing and use a RAW analysing software, like RawDigger.

-- hide signature --

Renato.
http://www.flickr.com/photos/rhlpedrosa/
OnExposure member
http://www.onexposure.net/
Good shooting and good luck
(after Ed Murrow)

 rhlpetrus's gear list:rhlpetrus's gear list
Nikon D7000 Nikon 1 V1 Nikon AF-S DX Nikkor 12-24mm f/4G ED-IF Nikon AF Nikkor 35mm f/2D Nikon AF-S Nikkor 70-300mm f/4.5-5.6G VR +3 more
Reply   Reply with quote   Complain
Post (hide subjects)Posted by
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow