Q3 minimum shutter speed

[brickftl]

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I set my camera to aperture priority - shutter on A and aperture ring dialed beyond the A, and I set an auto ISO limit of 25000. I want a min shutter speed, so in Auto ISO settings I set Shutter Speed Limit and set it to 1/500. Having done that, the shutter speed is still fluctuating based on whatever the light meter is reading as I move my camera around, and it stays slower than 1/500.

What am I doing wrong?

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[Me Leica!]

Wouldn't aperture priority over-ride everything?

I'm not familiar with the Q3, but based on general photography experience my first thought would be that if you put a camera on aperture priority, you're telling it to select a suitable shutter speed based on the aperture you set, so even if you specify minimum shutter speeds in the AUTO ISO section, the fact you're in aperture priority means that the camera will do exactly what it's meant to do in that mode.

I would have thought shutter priority would be what you want if you want to select a minimum shutter speed.

However, it's early morning where I am and I've only been awake a couple of hours, and someone with more technical knowledge may know something that I don't!

[brickftl]

yes the point of aperture priority is to set aperture and then shutter automatically fluctuates. But it does so coupled with auto ISO, and there's a specific setting (that doesn't seem to be working for me) which says in no event will the shutter be slower than X.

[Robert Ardinger]

On my Q3, If I set Auto ISO to a set upper limit, use Aperture priority, and set the lowest shutter speed to a fixed value ("X") and have the shutter speed dial on "A", the camera varies the ISO with the shutter speed staying at the fixed value going no higher or lower than the value I set except when the ISO limit has been reached. It then lowers the shutter speed below "X".

Conversely, the camera stays at the shutter speed set point, "X" until ISO of 100 is reached then it will increase the shutter speed.

If I have the lowest shutter speed set to "auto" the camera seems to default to 1/50 and seems to only chooses a different one if there would be an over or under exposre.  

As an example, in my experience, If I set the ISO to go no higher than 12,500 and the shutter speed to go no lower than 1/60, then as long as the ISO the camera chooses is below 12,500 it uses a shutter speed of 1/60 BUT if that combination (12,500 and 1/60) would result in an underexposure, the camera then lowers the shutter speed below my set limit.  If the scene is very bright and the camera moved the ISO down to 100 and that would be an overexposure, then it will increase the shutter speed above 1/60. 

Edited April 4 by Robert Ardinger

[brickftl]

ok too bad. I'd love an absolute limit on shutter speed irrespective of metering that would push auto ISO beyond the max setting. Oh well.

[Elliot Harper]

14 hours ago, brickftl said:

ok too bad. I'd love an absolute limit on shutter speed irrespective of metering that would push auto ISO beyond the max setting. Oh well.

As far as I know, there is no camera doing that.

ISO up limit is a hard limit. When it reaches there, only two things can happen: either shutter speed has to go below the limit, or you picture will go darker. I prefer to sacrifice shutter speed.

 

if you really want to do what you described, you use M mode and choose shutter speed from there, and set the auto ISO limit to a ridiculous high value.

Edited April 5 by Elliot Harper

[SrMi]

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The point of the ISO limit is to limit maximum noise. Once the ISO limit has been reached, the only way to maintain that noise limit is to lower the shutter speed below the preset shutter speed value.