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Olympus OM-D E-M10 The smallest and lightest Micro Four Thirds camera from Olympus with an integrated Electronic Viewfinder

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Old 3rd May 2015
sunflower sunflower is offline
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Unhappy Bulb problem - overexposure

I'm trying some long exposures using the bulb timer, but even with the aperture at f22, and a short exposure of 4 seconds, the result is a bright white picture. The EV seems to set itself arbitrarily at +3, and I can't change it.

Any ideas, please?
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Old 3rd May 2015
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Re: Bulb problem - overexposure

Have you checked what ISO setting was in use?
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Re: Bulb problem - overexposure

I tried ISO settings from 100 up to 400, with the same result every time. The EV will not move from 3+ and the image is almost completely white.
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Old 3rd May 2015
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Re: Bulb problem - overexposure

Are you using a ND filter because that sounds as expected to me?
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Re: Bulb problem - overexposure

No, I don't have an ND filter for the lens.
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Old 3rd May 2015
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Re: Bulb problem - overexposure

At this time of day (17:25) a measured exposure with a Sekonic Meter gives:

1/15s at f/22 with ISO 200

My camera told me 1/16s @ f/22 and ISO 200

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Re: Bulb problem - overexposure

I just tried those settings - thank you - but still the EV is setting itself at +3.0.

How would I ever be able to use a longer exposure and achieve a result?
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Re: Bulb problem - overexposure

Quote:
Originally Posted by sunflower View Post
I just tried those settings - thank you - but still the EV is setting itself at +3.0.

How would I ever be able to use a longer exposure and achieve a result?
As you are further East than us in the UK, I would expect the sun to have set a bit further, but if you are in the South of France, it could well be brighter than here, and I am somewhat envious

The EV is what it is, so to get a long shutter speed with daylight you need a strong ND Filter. Some at ND 8 may get it down a bit, but for really slow shutter speed in daylight you will need to use a "Big Stopper" ND 10 or more

These may help with the resultant exposure calculation:

http://www.genkin.org/apps/ndfilters/

http://www.dougchinnery.com/free_downloads/

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Re: Bulb problem - overexposure

Thank you.

Looks as if I'm going to have treat her to an ND filter.

Don't be envious. Here in south-west France we've had days of cold weather - people have switched their heating back on again - and rain. And forecast to remain wet into the foreseeable future.

That's why our club meeting next Tuesday will not now be a shoot in a picturesque village, but an indoor session. We've chosen to learn 'blur' and 'motion', hence the bulb experiment.

So not only is the weather very disagreeable, it's costing me a new filter.
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Old 4th May 2015
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Re: Bulb problem - overexposure

Hi - what is the subject that you are trying to photograph?
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Re: Bulb problem - overexposure

Hi

We haven't selected a subject yet. It's for a club meeting tomorrow, where we are going to be working on blur and motion. A pendulum is one idea that has been put forward.
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Re: Bulb problem - overexposure

Quote:
Originally Posted by sunflower View Post
Hi

We haven't selected a subject yet. It's for a club meeting tomorrow, where we are going to be working on blur and motion. A pendulum is one idea that has been put forward.
I was really trying to understand what you have been photographing that resulted in the white out. Were you outside in bright sunlight or were you indoors in a dark room?
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Re: Bulb problem - overexposure

Sorry, I misunderstood your question.

Just as an experiment, as I haven't used the bulb mode previously, I firstly tried indoors to catch the hand movement of my husband washing a dish. Then I tried outside, in fairly overcast conditions, to capture the flowers on a bush that was waving in the breeze.

The white-out occurred in both instances, with an aperture of f22, and the EV insisting on sticking at +3.

I think our class tomorrow will restrict itself to slow shutter speeds, but without using bulb mode. I simply wanted to try it to see what happened.
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Re: Bulb problem - overexposure

You would need an ultra fast shutter and good reflexes to catch most men washing dishes...

Please let us see the results that come out of this.

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Re: Bulb problem - overexposure

Quote:
Originally Posted by sunflower View Post
Sorry, I misunderstood your question.

Just as an experiment, as I haven't used the bulb mode previously, I firstly tried indoors to catch the hand movement of my husband washing a dish. Then I tried outside, in fairly overcast conditions, to capture the flowers on a bush that was waving in the breeze.

The white-out occurred in both instances, with an aperture of f22, and the EV insisting on sticking at +3.

I think our class tomorrow will restrict itself to slow shutter speeds, but without using bulb mode. I simply wanted to try it to see what happened.
I think that you are misunderstanding what the camera is telling you. Which is simply this: "If you set the camera controls like this, then your picture will be severely over-exposed."

Try photographing the bush again with a shutter speed of around 1/4 -> 1/2 second and a suitable aperture...
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