What is the camera thinking

mattyg

mattyg

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Matt
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Hi folks

I can't post any exif data as it was a mate having issues tonight.

Why would his D7100 in Aperture priority set the shutter to 8000 and set a high ISO (auto)


Any Ideas.

Matt
 
We were just discussing the topic "auto iso or not". My main reason for not using this is because of this very reason. There are times when auto iso is a must but I find that unless I absolutely have to use it I will not. I shoot a Canon 5DIII and I see this problem. I guess it is a matter of the camera not knowing what your priority is and picking the wrong settings. I was surprised that as long as the thread was no one else even mentioned this problem. I felt like I was the only one that came across this for the most part.

As far as why the camera would set auto iso, I shoot Canon so I'm not 100% sure but i would guess that he already had it set to auto iso. I really don't think that is a setting that would be pre-programmed.
:canon:
 
shaylou said:
I guess it is a matter of the camera not knowing what your priority is and picking the wrong settings.
Click to expand...
It's not really the camera that is doing the thinking though is it? The camera is just following the software that Canon have written. Surely Canon should know that once you get over a certain shutter speed to avoid camera shake or motion blur then the priority has to be a lower ISO.
This is the very reason I don't use Auto ISO because the intelligence behind it isn't quite there yet. If the 5DIII ever gets the same feature as the 1DX that allows you to use Auto ISO in Manual with exposure compensation then I'll use it a lot.
 
As far as I'm aware the auto iso on a nikon d7100 works in the same manner as other nikons. Were the pics close to a correct exposure?

There seems to be two possibilities. Most likely is that whilst in auto iso mode, he's unwittingly boosted the base iso to a value high enough that the camera has gone to max shutter speed for the chosen aperture in an attempt to get a 'correct' exposure. Easily done.

Less likely is that he's selected a min shutter speeds of 1/8000 in the auto iso menu.
 
-Rob- said:
It's not really the camera that is doing the thinking though is it? The camera is just following the software that Canon have written.


Of course it is. The software is part of the camera and the camera doesn't work without it . So when I said it is the camera that includes the software.

That's like saying a person doesn't do the thanking, his brain does . Though accurate, it's not at necessary.
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shaylou said:
Of course it is. The software is part of the camera and the camera doesn't work without it . So when I said it is the camera that includes the software.
That's like saying a person doesn't do the thanking, his brain does . Though accurate, it's not at necessary.
Click to expand...
What I meant was, Nikon (yes I know I said Canon originally....woops!!) have written the software poorly if it allows the camera to select 1/8000th & a high ISO. So the fault lies with the software developers who should be writing a lot more common sense in to the Auto ISO algorithms. Working out what photographers really want out of a shot when they use any kind of auto mode shouldn't be that difficult.
 
-Rob- said:
What I meant was, Nikon (yes I know I said Canon originally....woops!!) have written the software poorly if it allows the camera to select 1/8000th & a high ISO. So the fault lies with the software developers who should be writing a lot more common sense in to the Auto ISO algorithms. Working out what photographers really want out of a shot when they use any kind of auto mode shouldn't be that difficult.
Click to expand...


Ok now I get you. Thanks. And man it is one of those things that would of been useful.
 
sk66 said:
I doubt that it did... There's no operating mode where the camera would make both of those choices at the same time.

Graham's suggestion makes the most sense.
Click to expand...

I have a little further theory having experimented with my D600 which I guess works the same. If 'easy ISO' is enabled, then simply rotating the rear command dial will shift the iso around with no additional button pressing. This applies when auto iso is enabled as well where it will raise or lower the base iso (the lowest iso the camera will use in auto iso). It would be very, very easy to do this by accident without noticing.

I personally leave easy iso and easy exposure compensation switched off for this reason.
 
His Max ISO was set to 6400 min shutter was set to auto.

I'll try and get him to replicate the issue and post back


I have a feeling though that on the menu
top line said 6400
then auto on
max ISO 6400
shutter auto

So say he had set his ISO to 6400 in the menu shouldn't auto overide that
 
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mattyg said:
His Max ISO was set to 6400 min shutter was set to auto.

I'll try and get him to replicate the issue and post back


I have a feeling though that on the menu
top line said 6400
then auto on
max ISO 6400
shutter auto

So say he had set his ISO to 6400 in the menu shouldn't auto overide that
Click to expand...

No, that top value is a minimum iso value that the camera will use in auto iso. It's not particularly obvious in fairness. What he's effectively done is set the max and min to 6400 so the camera can only choose 6400 and then select a shutter speed to suit.

I'm sure there are scenarios where you'd break this rule but I nearly always leave base iso set at 100 and max at 6400 and let the camera work within that range when it's on auto iso.
 
gad-westy said:
I have a little further theory having experimented with my D600 which I guess works the same. If 'easy ISO' is enabled, then simply rotating the rear command dial will shift the iso around with no additional button pressing. This applies when auto iso is enabled as well where it will raise or lower the base iso (the lowest iso the camera will use in auto iso). It would be very, very easy to do this by accident without noticing.

I personally leave easy iso and easy exposure compensation switched off for this reason.
Click to expand...

My first camera was a 600d and loved it.

I think this is a good possibility. There are times even now that I reach for the wrong control to make an adjustment. If they are not that experienced then this could be something that happens all the time.

I think this would be a good time to explain why reviewing your shots can be so important. They would of caught this. Now you have a great example of why to do this.
 
shaylou said:
My first camera was a 600d and loved it.

I think this is a good possibility. There are times even now that I reach for the wrong control to make an adjustment. If they are not that experienced then this could be something that happens all the time.

I think this would be a good time to explain why reviewing your shots can be so important. They would of caught this. Now you have a great example of why to do this.
Click to expand...

Just in case there is any confusion, I was talking about the Nikon D600 rather than Canon 600D.
 
gad-westy said:
No, that top value is a minimum iso value that the camera will use in auto iso. It's not particularly obvious in fairness. What he's effectively done is set the max and min to 6400 so the camera can only choose 6400 and then select a shutter speed to suit.

I'm sure there are scenarios where you'd break this rule but I nearly always leave base iso set at 100 and max at 6400 and let the camera work within that range when it's on auto iso.
Click to expand...
:plus1:
except I will change the max ISO based upon the camera/situation...
 
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