Anyone use AUTO ISO

I know when and where and why to use ISO. Obviously you want to use as low of ISO as possible for sharper images, but cant always do that because of lighting.

Im wondering if anyone ever uses auto ISO? how good is it? im thinking might be nice feature to save time and easier. But curious how good it is and will it always choose lowest possible?

If you are sturggling with all the other decisions you need to make to get the shot, auto ISO can take one thing out of the way for you.

i use it lots. its ok at choosing the lowest iso on the 50d. on occasion i would have chosen lower. its horrible when using flash.

I use AUTO ISO when shooting "fast action" (like flying birds, sports and the like) where I need sufficient depth of field and a fast shutter speed (like 1/1000). With the 5D2 and sufficient light you can go to ISO 3200 or even 6400 without getting so much noise that you cannot get rid of it in PhotoShop ARC.

i use auto iso from time to time. like gasrocks said...it's one less thing to worry about if you don't have the time to figure it all out.

Only when I set it up as a point n shoot for the wife to use.

Some times, it works rather well on the 7D.

I have mentioned this a few times already, but I really wish we had an option to use exposure compensation in manual, when ISO is set to "auto".

I enjoy shooting manual with auto ISO, but it sucks we can't set EC like we can in other modes... I generally like to add +1/3 or +2/3 to expose to the right generally, but in manual it will balance out the ISO only to "0" with whatever metering mode you select.

They need to add a Tv/Av priority mode, with auto ISO that allows EC!

I use auto ISO on the 1D Mark IV in any situation where I would previously have used Av or Tv. This would be any situation with rapidly changing incident light conditions. Most commonly this would be a stage show or a day with broken clouds.

JeffreyG wrote in post #11914093
I use auto ISO on the 1D Mark IV in any situation where I would previously have used Av or Tv. This would be any situation with rapidly changing incident light conditions. Most commonly this would be a stage show or a day with broken clouds.

I don't own a MKIV, yet -- But can you 'collar' that to limit it to a max ISO?

S.Horton wrote in post #11914126
I don't own a MKIV, yet -- But can you 'collar' that to limit it to a max ISO?

Yes. There is a custom function that allows you to set max and min ISO levels and if you do so the auto ISO function will obey the limits.

Of course, if you set a limit of 3200 and the camera needs 12800 for the shutter speed and aperture you selected then it will just underexpose 3200 by two stops which is not much of an improvement over 12800.

The biggest problem with the auto-ISO implementation on the 1D4 is that there is no exposure compensation. You set the shutter and aperture and the meter picks the ISO. If you want to dial in some EC you have to do it via a tediuos workaround using the custom function for meter adjustment.

I'm 100% auto ISO at Shutter priority on the Rebel. It isn't always perfect I'm happy with the choice 80% of the time. Just one less thing to mess with with my high volume shooting Set and forget.
Sam

I dont use it on my 40D because it picks high iso's that I would not use for most shots. Like during bright daylight it is in the 400-800 range. Just plain stupid. I tend to like to keep it on 100 and only change when light is not sufficient. Newer cameras may manage this better than my 40D. I hope to find out some day!

Never used it, on the 450D (Xsi) it was real keen to use 400 or 800 all the time, meh, stuck it on 100 and left it there unless I need to raise it due to low light.

I've done the same with the 7D. I don't understand why you'd shoot at ISO800 when you can shoot at ISO100 and still use a decent shutter time..

JeffreyG wrote in post #11914182
Yes. There is a custom function that allows you to set max and min ISO levels and if you do so the auto ISO function will obey the limits.

Of course, if you set a limit of 3200 and the camera needs 12800 for the shutter speed and aperture you selected then it will just underexpose 3200 by two stops which is not much of an improvement over 12800.

The biggest problem with the auto-ISO implementation on the 1D4 is that there is no exposure compensation. You set the shutter and aperture and the meter picks the ISO. If you want to dial in some EC you have to do it via a tediuos workaround using the custom function for meter adjustment.

I wondered about that -- thank you!