S95 and YS-01 - Intermittent TTL on Auto and AV

[jgold]

Hi All -

I recently upgraded from an old Canon P&S to a S95 / Sea & Sea YS-01, canon dc38 housing. Based on the forum it appears that the S95 only will use TTL in Auto, AV, TV modes from reading through the board. As I understand it when TTL flash occurs the YS-01 LED on the bottom of the strobe should go green for 3 seconds after flash. This seems to work MOST of the time in Auto. However in AV or TV mode, while the strobe flashes, I don't get a green LED on the YS-01 after flash. Most of the shots seem to be over exposed.

In AV Mode i have the internal flash set to Maximum, flash set to On. The YS-01 is set to TTL. Am i missing something? Any thoughts would be appreciated.

 

[mozaik]

You are correct that the S95's TTL does not work in M mode.

You say that in Av you set the internal flash to maximum , this means you are putting it on manual. If you want TTL , the internal flash much be on auto..

In general, underwater , Manual mode will help you get better results and it is a big issue that Canon do not offer TTL in this mode ( not only for the S95 ) , some cameras like the Nikon P7100 do this TTL in Manual mode, perfectly. The outcome is 100 beautiful shots out of 100 in a dive. You worry about the lighting and the camera worries about the exposure.

Anyway , the S95 is a great camera and once you get used to shooting manual , your results will be brilliant and better than almost any other compact in the market.

 

[Interceptor121]

As mosaic says leave the flash in auto of you want ttl to take over if you set it to manual it should not even flash as the camera has no preflash in that mode and TTL expects that
I am just at the end of the first complete trip with the YS01 and I don't have a single overexposure all shots taken in TTL work to perfection including manual mode with CHDK hack plus script

 

[jgold]

I re-investigated my settings, flash was not set to Auto in TV and AV mode. Thanks for the tip!

I do have the CHDK hack to enable TTL in manual mode. I'm working through some test shots to try and try to dial in appropriate ISO/Shutter/Exposure settings.

 

[Interceptor121]

Is this my script for ttl or another one?

 

[jgold]

Is this my script for ttl or another one?

Yes, using your script, thanks! I'm still finding that no matter what mode (AV, TV, Manual w/ CHDK enabled or Program) that the YS-01 does flash, but the LED on the flash does not illuminate green (TTL enabled). Any ideas of what i could check for?

 

[Interceptor121]

I had not noticed that on the instruction manual, actually it is a total non sense as the flash is supposed to recharge in less than 2 seconds so why would it go green instead of red to tell you that is ready to shoot?
With the batteries I have the red light for flash ready comes up in less than one second I don't even have the time to see if it turned green

And the pictures are all exposed correctly as well including shooting the camera to the flash itself outside the housing and that definitely proves TTL flashes

When you say the shots are overexposed what do you refer to?

I recommend you set the strobe to TTL in front of the camera outside the housing and shoot, if the strobe fires and the picture is correctly exposed outside the housing than the strobe works correctly and the problem is elsewhere (possibly the fact you use a clear housing)

What strobe mask are you using and how do you connect to the camera?

 

[maria munn]

Hi there,

Can I ask what camera settings you are using too? I can definitely help to point you in the right direction of choosing the correct ISO and Aperture for certain subjects and scenarios so that your flash will work the magic that it can definitely do.

Maria

Helping underwater photographs take beautiful photos with compact camera since 2005 ..... there's even an award-winning book too