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Andaman Sea Blackwater

Started Jan 20, 2022 | Photos thread
Gkuzu Junior Member • Posts: 28
Re: Andaman Sea Blackwater

kelpdiver wrote:

gokhankuzu wrote:

- which, according to me, the iso 400 it uses here is still incorrect. If he had used iso 100, the photo would have been at least 3 times sharper.

I think that's a great closing note to ignoring you forever.

3x sharper is utter nonsense.

Maybe some day you'll supply the goods to prove it. But probably not.

There is no logical, technical explanation for keeping the iso high when using Flash. Especially for shots that don't have a background like blackwater.

When we increase the ISO, the light data from the diaphragm and shutter speed decreases.

High ISO has no positive effect on exposure. Exposure is not possible with iso. With high ISO, no data is sent to the sensor, on the contrary, the incoming data is reduced.

As the incoming data decreases, the sharpness decreases. The photo you see in high iso is not the light data, but the artificial image made by the processor.

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When to Change ISO Underwater – Ikelite

ISO and Flash Use

It's important to avoid the mistake of using too high of an ISO with strobes. If you shoot ISO 800 on a sun drenched reef and your strobes are set to TTL, the resulting images will be monotone blue or green. This is because when the scene is read by the TTL system, the camera thinks there's so much ambient light that all but the smallest blip of flash will overexpose the scene. So your strobes will be firing at a very low power and the colors on your subject will be washed out and lacking vibrancy.

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