ISO safety shift

What is this?

https://photography-on-the.net/forum/showthre​ad.php?t=44693

Where did you see that? My 5D has Safety shift for Av or Tv modes. If brightness changes quickly it will adjust the shutter or aperture. I would assume ISO Safety would change the ISO for you.

But what is ISO safety shift? or is that what they are explaining?

You set the AV and TV and ISO, If the light becomes to little or to much it will shift the ISO for proper exposure within the limits you set.

Photolistic wrote in post #2762910
But what is ISO safety shift? or is that what they are explaining?

So, which camera has that?

Mark

The new 1D Mk III

Headcase650 wrote in post #2763147
The new 1D Mk III

Ah, that would be a good function to have.

Mark

So what does safety shift do on the 1d classic? av/tv?

20D, and I think 30D sport mode adjusts the ISO to compensate changing light/exposure so that the shutter speed is higher for action shots etc. It would be nice to have ISO compensation in aDEP mode where you might need a certain shutter speed to stop some wind blown stuff and depth of focus

Mark_Cohran wrote in post #2763143
So, which camera has that?

Mark

40D also has it

Kraig C wrote in post #3863848
So what does safety shift do on the 1d classic? av/tv?

20D, and I think 30D sport mode adjusts the ISO to compensate changing light/exposure so that the shutter speed is higher for action shots etc. It would be nice to have ISO compensation in aDEP mode where you might need a certain shutter speed to stop some wind blown stuff and depth of focus

Yes - on Av, it'll shift the aperture when it runs outr of shutter speeds to vary;on Tv it'll change the shutter speed when it runs out of apertures.

S2000 wrote in post #3864447
40D also has it

However, when this thread started back in Feb., the 40D was still a rumor.

I've read that ISO safety shift isn't that reliable.

I too was curious about this feature but I gather it comes in real handy when you are shooting quickly. In short if you get into a situation where the lighting is too low for your settings rather than under expose the photo it bumps up your ISO. Of course you can do that too if you remember and have time but one thing it will do that you likely can't is bump it just enough to yield the right exposure - e.g. ISO 375. I gather it also works in conjunction with other features. So with Shutter preferred, if you set speed to 1/500, it respects that setting and plays with the ISO (only if needed) to get the right exposure once it has reached the limits of the aperture.

The Mark 2N and the 30D has the safety shift too. You have to turn it off for any kind of creativity or if you don't mind a little under exposure, for example, in order to get the shot.

I was shooting in a gym the other night and had safety shift on. It controled my aperture rather than me. I turned it off and set the shutter speed while the AV flashed at me (at 2.8). The shots came out good and less blur and other minor adjustments were made in Lightroom.

It has come in handy on the beach when I forgot my ISO was at 400. It adjusted AV for me and saved the shots.

My girlfriend's 40D doesn't have ISO safety shift, only Tv/Av safety shift.

I've used ISO SS on my 1Dmk3, along with the CFn to set a maximum shutter speed of 1/60, to be able to hand my camera to others. Keeps me out of trouble easier.