First Time Using Flash

donkeymusic

donkeymusic

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Name
Carlo
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Hello, i have used a flash unit on my camera this weekend and used it set to ttl whilst i used manual settings on the camera, during the day all photos seemed fine to me and flash fired when i expected it to. today i have imported the photos to Lightroom and am noticing they are have a lot of noise and that they were shooting at ISO 1600. now i did have the iso set to auto but didn't expect it to be using an iso that high.

Can anyone help me understand why this may have happened?

thanks
 
I don't really know Sony camera logic, but I think what has happened is that with Auto ISO, the camera is trying to adjust ISO to get a proper background exposure with the aperture and shutter speed you've set. So it's pumped up the ISO to 1600.

Then the flash has been used to light the foreground subject. If you still have an underexposed background, that probably means 1600 is as high as the Auto ISO will go and it's just been pegged there by the camera to get the best out of the background with the aperture and shutter speed.

It's best to go fully manual, though ISO 1600 doesn't sound too bad to me. Are you pixel peeping or is the Sony really that noisy at 1600?
 
I think what the camera does is set the iso first (according to the aperture/shutter speed you've entered) and then add a dash of flash if it sees fit.

When using flash I always switch auto iso off.
 
as said use full manual, set the iso to say iso 200 apature f4 shutter speed 160th, and bounce the flash if you can of the ceiling or wall makes a big difference, and just adjust one of the seting if you need more light adjust the flash power or up the iso or shot wider than f4, flash used properly will always beat high iso,
i did my duaghters bday on saturday we rented part of our local sports hall well 2 bits in different rooms, but the part we had food was about 60x60ft light was poor used d700 and shutter speed at 160th and apature of f2.8 needed iso 8000, and the d700 can do it but i used flash set at f4 iso 800 and 160th and bounced it of walls and even the high ceiling(its high) the difference is amazing.
 
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thanks for all the advice will have another play to see where i can improve.

thanks
 
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