Auto ISO function ?

Splog

Splog

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Steve
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Hi all

During last weekend on a woodland walk looking for some birdie shots :D I tried using the auto ISO feature (Canon 50D) The light was changing constantly and I was most impressed with how it performed :thumbs: I've also read that apparently the camera is able to set the ISO to suit rather than the fixed ISO settings :cool: .. i.e. ISO 385, 169 etc! although none of the shots I took actually did this!

Anyone using the auto ISO feature? and how true is it that the camera can use more extensive ISO settings :thinking:
 
I've used auto ISO almost exclusively for wildlife since the day the D3 came out. Fantastic feature if you ask me! You are correct, the camera adjusts the ISO values in 1/8 increments (or something along those lines, off the top of my head I can't remeber the exact value) :)
 
tarmac_chaser said:
But has anyone found that sometimes the acceptable shutter speed it chooses in say AV mode is a bit slow for certain subjects, ie 1/30 for wildlife
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On the D3, I use app priority and then set the min shutter speed I want to use. That's the best bit of auto ISO, you set the min shutter speed you want and it just bumps the ISO up if the light levels fall, thus keeping your shutter speed where you set :)

EDIT: The shutter speed WILL drop below your min set if the camera hits the max ISO range you set. So if you set a shutter of 1/500 and a max ISO of 3200 and the light levels drop so that ISO 3200 isn't enough to mantain 1/500 shutter speed it will start to lower the shutter down.

It's a great feature though because you know you will always get as clean an image as possible for the settings you need for the shot, regadless of the light levels changing. Very good for keeping a fast shutter speed for action or for when you are using a long focal length...for example if you are shooting at 600mm and know you can't hold the lens steady enough for a sharp shot under 1/300, you can set your min shutter there and know you'll have a good chance of sharp images.
 
tarmac_chaser said:
Yeah, of course was forgetting you can use Auto ISO in manual mode too leaving you control over aperture and shutter speed
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I just use app priority as I said above, then set my shutter for say 1/500 and that way I have full control over my depth of field still. Only used it in manual a couple of times but you can't set exposure compensation in manual, where as you can in shutter and app priority.
 
Richard Peters said:
I just use app priority as I said above, then set my shutter for say 1/500 and that way I have full control over my depth of field still. Only used it in manual a couple of times but you can't set exposure compensation in manual, where as you can in shutter and app priority.
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You can on a D300, so I would assume that the D3 would be the same Richard.
 
I use manual and it locks the auto iso at 400 for that, so can't be used with manual :(
 
Janice said:
I use manual and it locks the auto iso at 400 for that, so can't be used with manual :(
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:agree: TBH not sure why it does that :thinking: but it performs well in TV and AV :)
 
Richard Peters said:
hmmm that's interesting. The only time I tried on the D3 it just kept changing the ISO to give me a base line exposure, even when I put -3 stops! I'll have to go back and investigate!!
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I have used auto iso, and manual for a few years (D80 then D300), I know that I can just +1 to +2 for a backlit shot and it works a treat.
 
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