What is the difference between ittl and ttl

The iTTL metering is done by the camera system, and the flash simply has to accept the proper power level command. Preflash is with lens wide open, and preflash calculation sets the power level in the flash to be appropriate for the aperture which will be used, with no additional attention or monitoring no quenching concept as in film TTL. Multiple flash is done wirelessly via Commander, which can control groups of remote flashes.

This adds a delay, but adds wireless flash, multiple TTL flash, and it now also allows FV Lock, to lock a flash exposure for multiple frames, or simply to meter independently of shutter time FV Lock prevents pictures of subject blinking from timing of the earlier command flashes. More Here. Flash Naming Nomenclature and Compatibility : The first Nikon flash was the SB-1 in , but the first hot shoe thyristor model automated, the flash metering the exposure itself was the SB-2 model in Thyristor flash had a photocell in the flash body to meter the light reflected back from the subject, which quenched off the flash when exposure was deemed sufficient.

Subsequently film TTL work very similarly from a photocell in the camera, metering light reflected from the film surface, which had a big advantage of seeing only what the film and lens saw.

Digital D-TTL began in The three digit models are iTTL models. The later models, such as SB and SB etc. Here is a good look at the history of previous Nikon flash models. Plus the site has an impressive overall coverage of pretty much all Nikon gear for collectors. For any automation, both the camera and the flash must have the same capability. Otherwise, the flash only works in manual flash mode or possibly an Auto non-TTL flash mode, where the flash itself meters and controls the flash.

And also can still do any flash Auto mode where the flash itself meters the exposure , however, if the old flash cannot do the newer CLS communication, then the camera cannot otherwise communicate with the flash cannot send ISO or aperture info for example, so it would have to be entered in the flash manually.

Manual flash works best when the subject is not moving like this setup, posed shot. One of the main drawbacks of using a flash in manual mode is that you still need to figure out the optimal power output needed to obtain the correct exposure, which can be a time consuming process.

And thus, a manual flash can mainly be used while shooting portraits, headshots, and fine art. In other words, in situations where you can take time to setup the scene.

Many also believe that manual mode is the best to use to learn about external flash photography. You choose the output, click the picture and then review it. If it does not come out the way you were expecting and wanted it to, then you can tweak the settings and try again.

So you end up learning more in the process. When the flash output is directly controlled by your camera, it is called Through-the-Lens metering or TTL. Thus, using a flash in TTL mode will give you varied flash output.

The only method to control a TTL enabled flash is to use the flash exposure compensation function on the flash or through your camera settings. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. Install the app.

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You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Alright, first of all, I know my camera is TTL compatible.

Canon seams to be catching up with ETTL2 which is the first usable system they have. OP Tom K. Thanks for the comments and the links I had never been to smartshooters before - great site. Thank you for your concise and clear explanation. FKS wrote: not true. Anastigmat wrote: This test used the Fuji S2 Pro vs.

No single flash model is compatible with both cameras, Metz 54 so the results are not that revealing. F Forum M My threads. You may also like. The top 10 most popular cameras of according to our Instagram. Nikon D6: initial sample images. Nikon confirms first D6 units will ship out by end of May, after a brief delay.

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