Fixed iso and aperture


duster

Link Posted 02/01/2019 - 14:43
I'm trying to set up a user mode on my K3 that will give a five shot bracketed exposure with a fixed iso and fixed aperture. But I can't figure out how to do it or if it's possible.
Any ideas?

Nigelk

Link Posted 02/01/2019 - 15:38
On a K5II just use Av- Aperture priority, this just changes the shutter speed to adjust the exposures. Probably the same or similar on other bodies. These days I do exposure bracketing manually, gives you total flexibility and control.

duster

Link Posted 03/01/2019 - 09:21
Unfortunately, Nigelk, that doesn't work. although the aperture is fixed, the shutter speed and/or the iso is altered. I want to have fixed iso and aperture. Also I want to do it hand held for HDR. It may not be possible.

bforbes

Link Posted 03/01/2019 - 09:27
Does Nigel's suggestion not work if you take the ISO off the Auto setting?
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

derek897

Link Posted 03/01/2019 - 09:33
duster wrote:
Unfortunately, Nigelk, that doesn't work. although the aperture is fixed, the shutter speed and/or the iso is altered. I want to have fixed iso and aperture. Also I want to do it hand held for HDR. It may not be possible.

???
At least 1 of the 3 values has to change otherwise it's just the same shot.
I think you can set the range of iso, to a minimum, but something has to change,
Or am I just not understanding your point ?
I know what i like, If not always why.

duster

Link Posted 03/01/2019 - 09:39
Yes, I just want the shutter speed to change. I'll try limiting the iso range - never thought of that! Sometimes the obvious doesn't leap out!
Thanks

richandfleur

Link Posted 03/01/2019 - 09:45
Five bracketed photos with fixed iso and aperture only leaves the shutter speed to vary the exposure.

If you have a fixed iso then this should work fine. I found changing the iso settings a bit difficult at first, but you definitely should be able to achieve what you are after.
Last Edited by richandfleur on 03/01/2019 - 09:45

duster

Link Posted 03/01/2019 - 13:34
that's the answer. Av and limit the iso range.
thanks everyone

derek897

Link Posted 03/01/2019 - 13:35
Glad you got sorted
I know what i like, If not always why.
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