Linked Questions

3
votes
5answers
1k views

Does TTL by definition overexpose your subject? [duplicate]

So I'm only beginning to learn TTL but from what I understand the preflash determines how much flash power to use. But the camera already exposes everything correctly for the entire scene (assuming ...
2
votes
2answers
636 views

Why is flash TTL metering independent from ambient light metering? [duplicate]

In other words, why is ambient exposure metering independent from TTL metering? Let's say Im taking a picture in a room that has a window and some daylight is getting in,and Im shutting in P (program ...
30
votes
1answer
32k 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 ...
9
votes
4answers
8k views

How do I manually calculate fill flash?

My main flash is a Nikon SB-24, used on a Nikon D200. Hence, iTTL doesn't work. I've had no issues using A-mode (the thyristor in the flash determines flash output) or M-mode (manual on the flash) ...
3
votes
3answers
3k views

Is TTL flash really useful when using off-camera flash?

I have a Canon 700d and a 430EXIII flash. Recently I have been experimenting with off-camera flash. I was really surprised to see e-ttl ii available even when using off-camera flash (via the pop-up ...
7
votes
2answers
5k views

How can I calculate the effect of non-TTL flash on exposure?

I recently got an old Canon AE-1 film camera back in working order. I'd like to use my modern 430EXII Speedlight flash with it, however since there is no TTL metering, I have no idea how much the ...
0
votes
4answers
14k views

How can I use only the external flash on slave mode without firing the built-in flash?

I have a Canon 700D and YN-568EX ii external flash that I am using in slave mode. But whenever I try to fire the built-in flash pops up automatically and fires itself. Is there any option to use only ...
0
votes
5answers
1k views

How can I do Indoor flash photography with iso 100?

I've got a Canon 60D with a 30-70mm kit lens and a 50mm 1.8 along with a Yongnuo 568EX. I'm trying to improve on my event photography by creating a better balance between ambient and flash light. I'd ...
1
vote
1answer
274 views

What is this shadow in my photo?

I'm pretty sure the subject didn't move, the shutter speed was ok @1/80s. I was using Canon 70D + 18-55mm IS STM and a built-in flash and shot in RAW. What it could be? What may be causing this?
3
votes
3answers
240 views

Why don't semi-automatic modes on a DSLR take flash into account when calculating exposure?

I've purchased a TTL flash today and was surprised to learn that the camera (Canon 77D) is apparently not taking it into account when you set it to aperture priority or any other automatic mode. The ...
2
votes
3answers
546 views

How is 0EV for flash exposure compensation defined?

I'm trying to understand flash exposure compensation better. I get the relative scale, i.e., -1EV is half as much light as 0EV, but what is 0EV itself? Specifically: At 0EV, is the flash trying to ...
2
votes
2answers
373 views

Underexposed Images using Studio flash

Hoping someone can help. I am attempting to use some studio flash lights in my setup. I have a Canon EOS 1DS MKII, with a Speedlight 420EX attached to the hotshoe. When firing with just the 420EX, ...