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

FORUMS General Gear Talk Flash and Studio Lighting
Thread started 04 Nov 2006 (Saturday) 16:23   
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TMR ­ Design
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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?

Post #1, Nov 04, 2006 16:23:28


Please call me Robert or Rob, not TMR
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PeaPicker
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Check out this link.
Look down in table of contents. :)
http://photonotes.org/​articles/eos-flash/external link

Post #2, Nov 04, 2006 16:28:13


Jon / 40D / Picsexternal link

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Curtis ­ N
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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.

Post #3, Nov 04, 2006 16:54:23


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TMR ­ Design
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PeaPicker wrote in post #2216612external 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.

Post #4, Nov 04, 2006 19:18:42


Please call me Robert or Rob, not TMR
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PeaPicker
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TMR Design wrote in post #2217197external 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.

Post #5, Nov 05, 2006 10:59:44


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DavidEB
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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.

:)

Post #6, Nov 06, 2006 09:45:36


David
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Curtis ­ N
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DavidEB wrote in post #2224249external 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:

Post #7, Nov 06, 2006 09:52:03


"If you're not having fun, your pictures will reflect that." - Joe McNally
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RuggerJoe
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DavidEB wrote in post #2224249external 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:

Post #8, Nov 06, 2006 10:27:28


Joe

Comments / critiques always welcome.
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scottbergerphoto
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http://photography-on-the.net ...?t=46311&highlight=​ettlii

Post #9, Nov 06, 2006 13:35:40 as a reply to RuggerJoe's post 3 hours earlier.


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

Post #10, Nov 06, 2006 13:46:22


David
my stuff - [URL="http://[URL]www.​pbase.com/davideb"]my gallery - [URL="http://photograp​hy-on-the.net/forum/showpost​.php?p=3928125&postcou​nt=1"]go Rats!

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

Post #11, Nov 07, 2006 13:43:01 as a reply to DavidEB's post 23 hours earlier.


One World, One Voice Against Terror,
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Scott
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Titus213
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scottbergerphoto wrote in post #2230294external link
Thanks. I even got a new trench coat.;)

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

Post #12, Nov 07, 2006 17:07:42


Dave
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Titus213
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DavidEB wrote in post #2224249external 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.

Post #13, Nov 07, 2006 17:15:40


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totalbeginner
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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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Post #14, Feb 05, 2007 05:43:49 as a reply to Titus213's post 2 months earlier.


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René ­ Damkot
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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.

Post #15, Feb 05, 2007 07:20:14


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