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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 04 Nov 2006 (Saturday) 16:23
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Can someone please explain what exactly TTL, E-TTL and E-TTL II mean?

 
TMR ­ Design
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Nov 04, 2006 16:23 |  #1

I know this is a really basic question but I never really see this explained so whenever I see one of these abbreviations being used I am not sure what the distinction is between them.

Can someone give me the rundown?


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PeaPicker
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Nov 04, 2006 16:28 |  #2

Check out this link.
Look down in table of contents. :)
http://photonotes.org/​articles/eos-flash/ (external link)


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Curtis ­ N
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Nov 04, 2006 16:54 |  #3

TTL is an abbreviation for "through the lens". In a nutshell, TTL flash metering is a concept used by many camera manufacturers with film, measuring light reflecting off the film and shutting off the flash "in real time" as the exposure occured. A different system was required for digital cameras, and Canon refers to its version as E-TTL. Enhancements were made a few years ago and the enhanced version they call E-TTL II. E-TTL in its various forms uses a preflash to calculate the necessary flash power required before the shot is taken.

I highly recommend reading the link PeaPicker provided. It's a bit long, but very enlightening if you want to understand Canon's flash systems.


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TMR ­ Design
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Nov 04, 2006 19:18 |  #4

PeaPicker wrote in post #2216612 (external link)
Check out this link.
Look down in table of contents. :)
http://photonotes.org/​articles/eos-flash/ (external link)

Thanks Jon,

I just read a majority of that link. It helped quite a bit.


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PeaPicker
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Nov 05, 2006 10:59 |  #5

TMR Design wrote in post #2217197 (external link)
Thanks Jon,

I just read a majority of that link. It helped quite a bit.

Right before I noticed your post I just happened to enter "flash photography" on "The Google" and this site came up.
I learn something new here everyday.
Remembering it is the problem.


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DavidEB
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Nov 06, 2006 09:45 |  #6

E-TTL is a variant of ETTR.

ETTR means Expose To The Right, and is a method of using the histogram to get correctly exposed shots. The right side of the histogram represents the brighter pixels -- by exposing to the right, you get a nice, bright image.

E-TTL means Expose To The Left, and is canon's patented flash system designed to produce left-shifted histograms, giving underexposed flash shots.

:)


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Curtis ­ N
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Nov 06, 2006 09:52 |  #7

DavidEB wrote in post #2224249 (external link)
E-TTL means Expose To The Left, and is canon's patented flash system designed to produce left-shifted histograms, giving underexposed flash shots.

That explains a lot!
:rolleyes:


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Nov 06, 2006 10:27 |  #8

DavidEB wrote in post #2224249 (external link)
E-TTL is a variant of ETTR.

ETTR means Expose To The Right, and is a method of using the histogram to get correctly exposed shots. The right side of the histogram represents the brighter pixels -- by exposing to the right, you get a nice, bright image.

E-TTL means Expose To The Left, and is canon's patented flash system designed to produce left-shifted histograms, giving underexposed flash shots.

:)

Heheh...Never thought of it that way. :lol:


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Nov 06, 2006 13:35 as a reply to  @ RuggerJoe's post |  #9

http://photography-on-the.net …?t=46311&highli​ght=ettlii


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DavidEB
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Nov 06, 2006 13:46 |  #10

Scott, welcome back, haven't heard from you in a long time. you've always been really helpful, especially on the topic of flash.


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Nov 07, 2006 13:43 as a reply to  @ DavidEB's post |  #11

Thanks. I even got a new trench coat.;)


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Nov 07, 2006 17:07 |  #12

scottbergerphoto wrote in post #2230294 (external link)
Thanks. I even got a new trench coat.;)

OK, zip it up and get on with business......:o:lol:


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Titus213
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Nov 07, 2006 17:15 |  #13

DavidEB wrote in post #2224249 (external link)
E-TTL is a variant of ETTR.

ETTR means Expose To The Right, and is a method of using the histogram to get correctly exposed shots. The right side of the histogram represents the brighter pixels -- by exposing to the right, you get a nice, bright image.

E-TTL means Expose To The Left, and is canon's patented flash system designed to produce left-shifted histograms, giving underexposed flash shots.

:)

While this is a clever (and often accurate) description of the acronym the actual description is Evaluative Thru The Lens. The II added recently denotes a new version that in its mystery is probably darker than David's explanation above.

Evaluative - that pre-flash that is quite often not seen - is used to evaluate the scene.

TTL - it's done thru the lens by the camera as opposed to on the flash.


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Feb 05, 2007 05:43 as a reply to  @ Titus213's post |  #14

I've always been very frustrated by flash photography, but thanks to this thread it's actually starting to make sense! It really does make a difference when you know how your camera is thinking and I've actually managed to capture my first shot using fill flash. I know it's not great, but it's a start!

The only thing that I'm still unsure about is colour temperature. If you're using fill flash then you have a mixture of colour temps, what should you use as the white balance? Or, is it best to sort it out when you process your raw file?


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René ­ Damkot
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Feb 05, 2007 07:20 |  #15

Set the WB to the ambient color temp, and match up the flash by using a color gel.
Matching up mixed lighting in post is nearly impossible.


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Can someone please explain what exactly TTL, E-TTL and E-TTL II mean?
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