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Old 9th May 2018
RobEW RobEW is offline
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Help - random exposures from E-M1

I had some horribly erratic exposure metering from my E-M1 "classic" (or "mark I") yesterday, and wonder whether it's a known or diagnosable problem.

I've tried to replicate it today, and it seems to occur when I have the MMF-3 and 12-60SWD lens, but not when I have 60mm macro, and not when I have MMF-3 and 50mm macro. But I can't see how the lens would affect metering.

I was using aperture priority, f/5.6 (my default setting), and auto ISO floating between 200 and 1600, It was outdoors in very bright light and when it exposed well it was ISO 200 and 1/200th or 1/250th second. But in a series of near identical repeated shots it was giving me exposures as varied as ISO 1600 & 1/40th sec; ISO 200 & 1/125th sec; ISO 1600 & 1/60th sec; ISO 500 & 1/80th sec; ISO 200 & 1/100th sec; ISO 400 & 1/125th sec as well as quite a few that were reasonable. I have it set for ESP metering, was in S-AF + MF (and perhaps unusually have Release priority S, but I think that only affects focus, not exposure). I used the diamond symbol shutter shock setting with 0 seconds. The camera function dial was on "Iauto" but I have this programmed to be a customised version of aperture priority with a few changes to button assignments etc, so the dial position should be irrelevant I think.

Any ideas?
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Old 9th May 2018
MikeOxon MikeOxon is offline
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Re: Help - random exposures from E-M1

The metering depends on information being transmitted for the lens to the camera via those electrical contacts on the back of the lenses and adapters.

Try giving the connectors a wipe with a cotton bud, moistened with some alcohol or contact cleaner, in case there's a bit of grease in the way.
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Re: Help - random exposures from E-M1

Is that really the case? Perhaps I'm showing my ignorance here, but I thought the metering was a conversation that took place entirely within the camera body, as it measures the amount of light hitting the sensor and closes the shutter when it's enough. Maybe my mental model of what's happening is inaccurate ... ?
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Old 9th May 2018
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Re: Help - random exposures from E-M1

If you are only seeing the effects on this lens I would suspect a sticking aperture on the 12-60mm SWD - it is prone to this...
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Re: Help - random exposures from E-M1

Check the 12-60 lens, the aperture blades might be stuck - a well known problem with that lens.
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Re: Help - random exposures from E-M1

Quote:
Originally Posted by scottwin View Post
if you are only seeing the effects on this lens i would suspect a sticking aperture on the 12-60mm swd - it is prone to this...
__snap!!__
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Re: Help - random exposures from E-M1

Just got mine back from Luton Camera after repair for this very problem .. so have very recent experience...
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Re: Help - random exposures from E-M1

Use M mode and take back control. Auto ISO, say no thanks and set it as YOU wish.

The camera isn't a photographer, you are. All this auto nonsense does my head in.
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Re: Help - random exposures from E-M1

Quote:
Originally Posted by Ricoh View Post
Use M mode and take back control. Auto ISO, say no thanks and set it as YOU wish.

The camera isn't a photographer, you are. All this auto nonsense does my head in.
Irrelevant
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Re: Help - random exposures from E-M1

Quote:
Originally Posted by RobEW View Post
Is that really the case? ... ?
I note that others have suggested a sticky diaphragm on the 12-60, which could well be the case. The camera body does, however, need to know the aperture of the lens, while other information, such as focal length, may also be used to assist metering.

There is a detailed account of what information is passed between lens and camera at http://marcuswolschon.blogspot.co.uk...ur-thirds.html , in which the author points out that
"The electronic feedback from the lens tells the camera
where it is in regards to f-stop, and the camera then
interprets that information."
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Re: Help - random exposures from E-M1

You folk are brilliant with useful information.

How can I check for a sticky aperture? And if this proves to be the problem, is it expensive to get fixed? (I can get to Luton okay). And is the fix a permanent-ish fix, or just tiding over till it next gets sticky?

I wasn't changing the aperture settings on the camera at all between these repeated exposures so - on a simplistic model at least - I would imaging that sticking aperture blades would be irrelevant?

It's been a wonderful lens for the money in most ways ... so far.
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Re: Help - random exposures from E-M1

just called Luton cameras. It's a common problem with that lens, and the part which is usually needed costs about 62, and labour about 85 as it needs a complete strip down, and then VAT makes it I suppose about 180 all told. But used ones often sell for around 250 or even less on Ebay. Seems a waste of good glass. Maybe if it's a common fault it's best to have a repaired one rather than a broken one and one likely to go the same way.
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Re: Help - random exposures from E-M1

My only comment is that if you get it repaired, you will/should get a guarantee for 6 or 12 months..............

Buy another and you might have the same problem..............
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Re: Help - random exposures from E-M1

Quote:
Originally Posted by RobEW View Post
I wasn't changing the aperture settings on the camera at all between these repeated exposures so - on a simplistic model at least - I would imaging that sticking aperture blades would be irrelevant?
It doesn't matter that you didn't alter the aperture, between each exposure the diaphragm reverts to maximum aperture (or should do, unless it is sticking). Then, when you take the next shot, it fleetingly stops down whilst the shutter is open before returning again to maximum aperture. It seems likely that the diaphragm blades are sticking during one or both of these actions.
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Re: Help - random exposures from E-M1

Thanks for that clarification. I guess this is done to enable live view. Most of my knowledge of photography is half remembered from the days of film-based SLRs with old fashioned aperture rings which you moved by hand, so you always knew exactly where you stood. I am also familiar with the (antiquated to some) notion of rotating a different ring on the lens barrel to focus, and rotating a dial on top of the camera to specify the ASA of the film. While my back was turned, ASA became re-badged as ISO, and lenses transmogrified from optical devices to electronic devices with glazing!
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