Odd problem with D80

alexisonfire

alexisonfire

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Mike Simpson
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My D80 started playing up last week on a shoot, i'm not sure if its a problem or something i've done (i doubt its the latter) but it is reoccurring as I was having trouble with it on Saturday too.

Basically when shooting in good light my camera seems to be using unnecessarily high ISO when on autoISO. I have autoISO on a slowest shutter speed of 1/60 yet I'm finding its choosing ISO's up to 1600 in some cases when I have a shutter speed of 1/3000 - 1/4000 (shooting at f/1.8 in daylight).

Anybody got any ideas? Faulty meter maybe?
 
The majority was aperture priority, but I'm fairly sure it's done it when in manual too.
 
If you're on auto iso and the camera feels that your shutter speed is too high/aperture too small to obtain a "correct" exposure then it will raise the iso to compensate
 
Joe T said:
Can you post an example (with EXIF)?
Click to expand...

I can't show the photos from the shoot last week yet, but in this thread you can see a few photos which have the problem. (f/1.8, 1/4000, iso640 for example).

trinitronfan said:
Why use auto ISO? I always shoot at the lowest ISO possible.
Click to expand...

Um....Thats the exact point of autoiso. It automatically changes ISO so its the lowest thats possible without you having to worry about it. You set a suitable shutterspeed and if the camera goes below that it ups the ISO.
 
Are you sure you are not in shutter priority?

Setting 1/4000 sec, would force the camera to go to the largest aperture, then start upping the ISO.
 
alexisonfire said:
Anybody got any ideas? Faulty meter maybe?
Click to expand...

Check your metering modes mate, is the issue occuring on all three?

Also make sure that all the exposure compensations are zero'd.
Even the exposure compensation, metering custom functions too, has the partial metering points been altered etc.

trinitronfan said:
Why use auto ISO? I always shoot at the lowest ISO possible.
Click to expand...

There are a variety of circumstances where auto ISO is a facility sent by God.

Imagine that:

1: Noise levels in your image are a non issue, it doesn't matter if the image is grainy or you have a very clean ISO at higher sensitivity's.
All that is important is getting the shot.

2: You need your aperture to remain constant.

3: You need your shutter speed to remain constant.

Basically it removes the variable from either slowing shutter speeds down as in aperture priority modes or balancing aperture for shutter priority.

IMO, combined with partial or spot metering, this facility is awesome for sports and any general fast action or in environments with rapid light source changes.
For figure skating I have auto ISO, 1/800th minumum and a constant f/2.8, depending on the quality of the arena's light, ISO will be anything up to 800 to 12,800.
 
Just checked the exif on the last shot, it says ISO used 450, further down it says ISO requested 1600.

Have you checked through your settings in the menus? I wonder if you have hit a button combination accidentally that has changed something without you realising. I did this the other week on my D300, took me a while to work out what had happened.
 
Just checked through CSM and all settings are normal. Not entirely sure what it means by ISO requested 1600. Autoiso is set to a max of ISO1600, maybe its referring to that? I really don't think its a setting as it seems inconsistent with each photo, even with identical aperture and shutter speed. odd.
 
I've just noticed i have two photos 1 second apart both taken on aperture priority...

a) F/16 - 1/1000 - ISO1600
b) F/18 - 1/60 - ISO200

While a very similar outcome, the settings are completely different. As you can see the second EXIF has worked as it should. F/18 - 1/60 - ISO100 wasn't enough so autoISO changed it too iso200 to get my minimum shutter speed of 1/60. But in the first it has seemed to of skitzed out.
 
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