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Andaman Sea Blackwater

Started Jan 20, 2022 | Photos thread
OP Barmaglot_07 Contributing Member • Posts: 633
Re: Andaman Sea Blackwater

gokhankuzu wrote:

TTL is useless in those dives, focus light or torchlight will mislead TTL.

On the opposite, TTL is quite useful when you're dealing with subjects that can be translucent (need lots of light) or reflective (need just a little light), and you have no time to play with the settings.

But this is a night dive and the f value is definitely wrong and also iso value. You should take the photo the moment you focus on it. f8- max f11 and iso 100 will give you incomparably better results than f25 and 800.

As I said, prove me wrong. Hop over to Florida, go on a blackwater dive or three - plenty of operators running them there, - then post your images taken at f/8 and ISO 100. My experience is that without extra DoF buffer afforded by small apertures, subjects will move out of focus during the fraction of a second it takes to pull the trigger, lens aperture to stop down, and optionally the strobes to fire a TTL metering pre-flash. Consecutively, a small aperture at base ISO values ends up needing more light output than the strobes can supply, hence the increase in ISO. My setting of 800 was indeed somewhat higher than needed, as I had misremembered a certain feature of my camera - for me, using a Sony A6300, the optimal ISO value is 400.

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