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06-16-2016, 06:33 AM   #1
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K50 aperture bracketing with control over ISO/Shutter time?

New K-50 owner here.

Is there a way on the K-50 to do “aperture bracketing”,with a 3-shot burst the same way regular exposure bracketing works?

The exposure bracketing mode in my experience does the following

In Tv mode, it changes the ISO for a bracket
in S, M, TAv or Av it changes the shutter speed for a bracket.
in auto it changes both ISO and shutter speed

I would like to do one of the following, automatically in a 3 shot burst.

i) keep ISO the same, go from EV, +1EV, +2EV SOLELY by increasing aperture and and solely compensating by changing the shutter speed.

or

ii) keep ISO the same, go from metered aperture/shutter suggestion then +1 f stop, +2 f stops without changing the shutter speed (so that images were perhaps over exposed)

I know I can do this in M mode or in Av mode by manually increasing the aperture, but I want to automatically bracket…..
Am i missing something buried in a menu somewhere, or should I select a different mode?

If not, is there a firmware hack or - gasp - another camera body that allows this? [I believe, booo!, that some nikons do this]

Help me pentaxians!

06-16-2016, 07:27 AM   #2
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If you set your ISO to a fixed value what does it do in Tv mode?
06-16-2016, 08:30 AM   #3
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QuoteOriginally posted by UncleVanya Quote
If you set your ISO to a fixed value what does it do in Tv mode?
^^^^^^ What he said...

Variations of this question come up all the time. The short answer is that two of the three exposure variables (aperture, shutter, sensitivity) must be fixed if you want to bracket on a single setting.


Steve
06-16-2016, 12:33 PM   #4
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But. 'exposure bracketing' is exactly that .... Brackets of different exposure values (brighter and / or darker) in a sequence. Your first request for aperture to change with a compensating ISO or shutter adjustment is NOT exposure bracketing because the brightness would be the same.

EB was really originally for film users to quickly grab a range of exposures when it was difficult to judge exactly the right EV to use .... Now it has become a tool for HDR users.

So I really think what you want to do is for manual mode .... You can keep your exposure value the same by reference to the scale along the bottom of the viewfinder as you change your aperture and make the compensatory other adjustments.

06-16-2016, 02:38 PM   #5
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There is no "depth of field bracketing" option or hack at the moment. Like others have said, you can force the camera to vary the aperture in exposure bracketing, but you'll still get varying exposure.

Adam
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06-16-2016, 04:15 PM   #6
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QuoteOriginally posted by Adam Quote
There is no "depth of field bracketing" option or hack at the moment. Like others have said, you can force the camera to vary the aperture in exposure bracketing, but you'll still get varying exposure.
So, I tried out the suggestions from unclevanya and it works Tv mode with a fixed ISO....but as other suggested above, with different exposures.

This seems to work most times - sometimes it does all three apertures differently, and sometimes 2/3 are the same (yet are the same ISO, fixed, and the same shutter speed, yet some appear lighter...weird. what other variable apart from ISO/apeture/speed could change). Anyway, this is a step in the right direction! Thanks.
06-16-2016, 04:24 PM   #7
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QuoteOriginally posted by lalochezia Quote
This seems to work most times - sometimes it does all three apertures differently, and sometimes 2/3 are the same (yet are the same ISO, fixed, and the same shutter speed, yet some appear lighter...weird. what other variable apart from ISO/apeture/speed could change). Anyway, this is a step in the right direction! Thanks.
Vignetting can play a part here, especially if one of the apertures is close to wide open.

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06-16-2016, 07:07 PM   #8
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QuoteOriginally posted by mcgregni Quote
But. 'exposure bracketing' is exactly that .... Brackets of different exposure values (brighter and / or darker) in a sequence. Your first request for aperture to change with a compensating ISO or shutter adjustment is NOT exposure bracketing because the brightness would be the same.
I do not read the request that way. Did I miss something?

QuoteOriginally posted by Adam Quote
There is no "depth of field bracketing" option or hack at the moment. Like others have said, you can force the camera to vary the aperture in exposure bracketing, but you'll still get varying exposure.
I thought this might be what he was asking for (for some reason it is a recurring subject on the K-30/K-50 forum), but was not sure.


Steve

06-16-2016, 07:22 PM   #9
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Given the latitude in raw I would assume that a couple of stops would be easy to adjust around.
06-17-2016, 12:24 AM   #10
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I think given that this particular photographic situation (whatever the subject may be) is clearly a rather precision operation (concerned with variations in depth of field) then best to forget about any automated approach ... Just do it in manual mode.
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