Why does ISO blink?

[bullandram]

I’m trying to figure out what it means when the ISO starts to blink on the A7 iii? 

[Chrissie]

Thanks for not introducing yourself as a first-time poster.

The ISO blinks, because the camera can not pick the necessary ISO value to end up with a well exposed, i.e. not too bright or not too dark, picture. At this time of the year I would assume that you are at risk of under-exposing your shot.

The most likely causes for this are at least one, or a combination of the following:

• shooting in manual mode "M"
• setting a very small aperture
• setting a very short shutter speed
• configuring an ISO Auto "max" and "min" value which further restricts the range the ISO automatic can pick from
• exhausting the specified ISO range for your camera (unlikely)

To test this, I would set the camera to manual "M" mode, then successively relax the restraints on aperture and/or shutter speed, until the blinking goes away.

Captain Obvious: for this test to work, you need to remove the protective cap from the front element of your lens.

See this on info about how to set ISO Auto Min and Max values.

Edited November 22, 2018 by Chrissie

[bullandram]

Thank you for your input. I will definitely make adjustments and see what’s happening. I’m new to forums and have no idea on etiquette. Ha! Just a newbie in photography. I’m sure I will ask multiple questions that will seem like no brainers for the experienced, but I’m shameless and will ask anyways.

Heres a weird question...Have you seen or heard of a pink line showing up on photos with the Sony A7 iii? I might could post an example tomorrow of it. It’s happened on two of my photos in one day of shooting. 

[tinplater]

11 hours ago, bullandram said:

Thank you for your input. I will definitely make adjustments and see what’s happening. I’m new to forums and have no idea on etiquette. Ha! Just a newbie in photography. I’m sure I will ask multiple questions that will seem like no brainers for the experienced, but I’m shameless and will ask anyways.

Heres a weird question...Have you seen or heard of a pink line showing up on photos with the Sony A7 iii? I might could post an example tomorrow of it. It’s happened on two of my photos in one day of shooting. 

Welcome..don't be afraid to ask questions.  However it is generally a good idea to research your questions first as many new to photography folks ask the same questions over and over.  I would strongly suggest you go to youtube and check out the numerous tutorials on the Sony a7III.  Invest some time and practice with the camera...really good news you don't have to worry about wasting "film" as you experiment with all the numerous options available to make great pictures.

As for your pink line, weird banding effects can show up under unique lighting conditions; posting an image or two would help get you some guidance with that problem.