The ttl tag has no wiki summary.
22
votes
1answer
5k views
What are the differences between E-TTL, i-TTL, and P-TTL?
Canon, Nikon and Pentax each have their own TTL flash metering systems, respectively E-TTL, i-TTL, and P-TTL. They all use a weak preflash that is metered and used to calculate flash power level ...
18
votes
3answers
5k views
What does TTL mean?
I'm new to photography and I see the term TTL all over the place. What does it mean? And how do I use it to make my pictures better?
6
votes
6answers
1k views
Advantages of TTL over manual mode when using speedlites
Yesterday a user on stackexchange asked me why do I prefer manual over TTL when working with speedlites. I use them mostly off-camera and I've developed a kind of a workflow where I do not walk back ...
3
votes
4answers
657 views
Why is manual flash at the lowest power stronger than the TTL result?
I have a 500D with the 430EX II flashgun. I've taken two pictures with the camera in manual mode, one with the flash in ETTL mode and then in manual mode with the power to 1/64 and the flash exposure ...
10
votes
1answer
361 views
Why isn't TTL metering accurate when using a non-electronic lens?
I recently bought a Lensbaby lens and I played with it a lot. Then lens is awesome but I have one big and annoying problem and is that TTL metering fails miserably when using P, TV and M modes.
I ...
6
votes
2answers
1k views
Are there any radio flash triggers capable of P-TTL?
All the popular radio TTL flash triggers, like PocketWizard or RadioPopper, seem to be only available in Nikon and Canon flavors. Are there any models capable of transmitting Pentax P-TTL data?
4
votes
3answers
73 views
What are the most important features to look for in a low budget hotshoe flash and why?
When trying to get started with flash photography, there are a lot of new options, features and techniques that a photographer gets thrown in to. When starting on a budget, what features will give a ...
1
vote
3answers
242 views
How do TTL flash metering systems calculate how much power is needed?
Does anyone know how TTL calculates the amount of power to put in after the preflash is done? I understand that the value is somewhat brand specific, but what is the general logic? Because if you ...
