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Olympus E-5 E-5 specific discussion.

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Old 25th July 2017
piglicker piglicker is offline
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badly underexposed at 1/8000

hi guys,

has anyone else noticed that photos shot at 1/8000 are badly underexposed?

i came across it will auto-bracketing on a sunny day .. all the exposures shift by what looks like the correct amount, but the 1/8000 shots are nearly black. i was using the 12-60mm SWD at the time...

advTHANKSance
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Old 25th July 2017
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Re: badly underexposed at 1/8000

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Originally Posted by piglicker View Post
hi guys,

has anyone else noticed that photos shot at 1/8000 are badly underexposed?

i came across it will auto-bracketing on a sunny day .. all the exposures shift by what looks like the correct amount, but the 1/8000 shots are nearly black. i was using the 12-60mm SWD at the time...

advTHANKSance
Is it the camera's setting, or is it the failure of the lens aperture blades? Both my SWD lenses (50-200 & 12-60 lenses bought used over the last couple of years) have failed like that. On the E-5 there is the Preview function button on the front & that will close the aperture blades down to whatever aperture set on the camera (e.g. in Aperture Priority or Manual) & if selecting f22 & exercising it then the fault may show up (like mind did & stuck closed). The other possibility could be the shutter mechanism, but I suspect the lens in this case, but can still be repaired, which is what I intend to do with my 12-60 SWD lens.
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Old 25th July 2017
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Re: badly underexposed at 1/8000

i don't think it's the lens - but it's worth doing some tests, so thanks for the pointer...

i think i've experienced the problem on other lenses, and i was wide open on aperture-priority while rattling off these brackets (which is why the camera cranked it up to 8000).

once the sun makes another appearance, i'll play around. might be a while, though - i'm in scotland
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Old 25th July 2017
Petrochemist Petrochemist is offline
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Re: badly underexposed at 1/8000

It sounds to me as if your lens aperture won't go wide enough.
1/8000 is a fast shutter speed, so needs unusual conditions.

I believe the maximum aperture of this lens is f/2.8 to f/4 'Sunny 16 rule' suggests with the aperture wide open your ISO would need to be at least 250 (500 if zoomed in) for roughly correct exposure, when in full sunshine. A little bit of shade will make it considerably worse.
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Old 25th July 2017
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Re: badly underexposed at 1/8000

just tried it with the lens off, and the ISO bumped up...

1/4000 is fine
1/5000 is maybe slightly dark
1/6400 is maybe 2/3 stop dark
1/8000 is virtually black

maybe my shutter is going too fast, or the metering system can't do its' sums beyond 5000...
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Old 1st August 2017
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Re: badly underexposed at 1/8000

Could it be a sticky shutter?
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Old 2nd August 2017
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Re: badly underexposed at 1/8000

ah, so the first curtain is a bit lethargic and the second curtain is on cue?

could be .. and i guess if the sticky-lag is only very small, then it'll only show up at fast shutter speeds.

i'll maybe look into fixing it, but i get the feeling it'd cost a fair bit and it's a very edge-case scenario. maybe i'll change my mind on that after a few more ruined 1/8000s shots
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Old 2nd August 2017
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Re: badly underexposed at 1/8000

If the metering is showing the shutter speeds (at 1/8000 sec) are fine & it comes out dark, then it is either a slow acting lens aperture mechanism or camera's shutter curtain. Using the Preview button on the camera's front (E-M1's) with aperture closed down (up to f22) will show if it is failing or not & if that is OK then the shutter may very well be the problem. Just make sure the lens contacts are clean though.

Quote:
Originally Posted by piglicker View Post
just tried it with the lens off, and the ISO bumped up...

1/4000 is fine
1/5000 is maybe slightly dark
1/6400 is maybe 2/3 stop dark
1/8000 is virtually black

maybe my shutter is going too fast, or the metering system can't do its' sums beyond 5000...
That doesn't say anything really, because it still depends on how much light there is & proper metering is needed to show if that fast shutter speed is just too fast for an exposure, depending on other settings, but the metering will show that.
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Cameras: OM-D E-M1 & Mk II, Olympus Stylus 1, OM-D E-M5.
Lenses: M.ZD12-40mm f2.8 PRO Lens, M.ZD40-150mm f2.8 PRO Lens with MC-14, M.ZD12-50, M.ZD60 Macro, M.ZD75-300 Mk II, MMF-3, ZD14-54 II, Sigma 150mm F2.8 APO Macro DG HSM.
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