Nikon: ISO sensitivity auto control - Not functioning , WHY ?

[wilbur007]

Dear Nikon user,

I set to A mode.
Under the menu ISO sensitivity auto control, i had On & set Maximum ISO set to 1600 & minimum shutter speed set 100
Why not functioning?
Anyone can help me ?

[sod]

sorry...how do you know its not functioning?

[ndgoh]

Which camera model are you using? Which lens? And can post the photo here?

[wilbur007]

sorry...how do you know its not functioning?

The iso is within d margin, but d shutter is lower than wat I set

[wilbur007]

Which camera model are you using? Which lens? And can post the photo here?

I'm using D700 attached with 24-70. The auto iso is working, jz d shutter is not under my control , is it normal?

[drifit]

within iso range set. to capture the correct exposure, lower the shutter speed cause it cant set a f/2.8 lens to f/1.2.
so, is it normal?

[wilbur007]

within iso range set. to capture the correct exposure, lower the shutter speed cause it cant set a f/2.8 lens to f/1.2.
so, is it normal?

A mode
Iso set to 1600
Shutter speed set to 1/100
F2.8

Photo output iso 1600, shutter 1/80,f2.8

So is it normal? Iso within d range set, and shutter speed not correct,is it system will auto correct d exposure, adjust/correct d the shutter speed,am I right?

[drifit]

if you read back the instruction manual, camera will break the shutter speed rules to achieve the correct exposure.
not sure until when it will break the ISO rules set.

[dacmo]

A mode
Iso set to 1600
Shutter speed set to 1/100
F2.8

Photo output iso 1600, shutter 1/80,f2.8

So is it normal? Iso within d range set, and shutter speed not correct,is it system will auto correct d exposure, adjust/correct d the shutter speed,am I right?

Yes it's correct. Basically, the camera is telling you that it cannot achieve the shutter speed of 1/100 f/2.8 even at ISO1600 and that's why it will lower your shutter speed.

The way it works is once it achieves the max ISO that you have set, it will break the shutter rule of a 1/100 minimum and start to drop it to achieve a proper exposure.

[sod]

agreed... the camera lowers the shutter speed to get proper exposure when iso reach the max limit

[wilbur007]

Hi guyz, thank you very much for ur details explanation.

[wilbur007]

if you read back the instruction manual, camera will break the shutter speed rules to achieve the correct exposure.
not sure until when it will break the ISO rules set.

yes i jz read d manual book, it got mentioned slower shutter speeds mayb used if optimum exposure cannot be achieved at the ISO value selected for Maximum sensitivity.

[putragraphy]

lesson learnt...
do read your manual....

[wilbur007]

lesson learnt...
do read your manual....

Yes Sir