Olympus UK E-System User Group
Olympus UK E-System User Group

Join our unique resource for Olympus Four Thirds E-System DSLR and Pen and OM-D Micro Four Thirds photographers. Show your images via our free e-group photo gallery. Please read the e-group.uk.net forum terms and conditions before posting for the first time. Above all, welcome!


Go Back   Olympus UK E-System User Group > General photography discussion

General photography discussion Please look for a specific board to start your thread but if you can't find an appropriate one, post it here.

Reply
 
Thread Tools Display Modes
  #1  
Old 2 Weeks Ago
RobEW RobEW is offline
Full member
 
Join Date: Feb 2017
Location: Nottingham
Posts: 1,113
Thanks: 123
Thanked 31 Times in 30 Posts
Likes: 641
Liked 82 Times in 59 Posts
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?
Reply With Quote
  #2  
Old 2 Weeks Ago
MikeOxon MikeOxon is offline
Full member
 
Join Date: Nov 2017
Location: oxford
Posts: 199
Thanks: 19
Thanked 44 Times in 38 Posts
Likes: 27
Liked 68 Times in 44 Posts
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.
__________________
Mike
visit my Natural History Photos website:
http://home.btconnect.com/mike.flemming/
Reply With Quote
The Following User Says Thank You to MikeOxon For This Useful Post:
RobEW (2 Weeks Ago)
The Following User Liked This Post:
RobEW (2 Weeks Ago)
  #3  
Old 2 Weeks Ago
RobEW RobEW is offline
Full member
 
Join Date: Feb 2017
Location: Nottingham
Posts: 1,113
Thanks: 123
Thanked 31 Times in 30 Posts
Likes: 641
Liked 82 Times in 59 Posts
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 ... ?
Reply With Quote
  #4  
Old 2 Weeks Ago
Scottwin Scottwin is offline
Full member
 
Join Date: Jun 2012
Location: Aberdeenshire, Scotland
Posts: 77
Thanks: 12
Thanked 9 Times in 9 Posts
Likes: 40
Liked 14 Times in 11 Posts
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...
__________________
Pictures on Flickr
https://www.flickr.com/photos/scotts_photies/
Reply With Quote
The Following User Says Thank You to Scottwin For This Useful Post:
RobEW (2 Weeks Ago)
  #5  
Old 2 Weeks Ago
IainMacD's Avatar
IainMacD IainMacD is offline
Full member
 
Join Date: Mar 2008
Location: Drumnadrochit
Posts: 3,380
Thanks: 1,163
Thanked 503 Times in 452 Posts
Likes: 1,424
Liked 605 Times in 197 Posts
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.
__________________
Iain

E-M5 II, E-M1, 7.5, 8-18, 12-40, 17, 40-150, 45, 60, 300

Website
Flickr
Reply With Quote
The Following User Says Thank You to IainMacD For This Useful Post:
RobEW (2 Weeks Ago)
  #6  
Old 2 Weeks Ago
IainMacD's Avatar
IainMacD IainMacD is offline
Full member
 
Join Date: Mar 2008
Location: Drumnadrochit
Posts: 3,380
Thanks: 1,163
Thanked 503 Times in 452 Posts
Likes: 1,424
Liked 605 Times in 197 Posts
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!!__
__________________
Iain

E-M5 II, E-M1, 7.5, 8-18, 12-40, 17, 40-150, 45, 60, 300

Website
Flickr
Reply With Quote
The Following User Says Thank You to IainMacD For This Useful Post:
RobEW (2 Weeks Ago)
The Following User Liked This Post:
Scottwin (2 Weeks Ago)
  #7  
Old 2 Weeks Ago
Scottwin Scottwin is offline
Full member
 
Join Date: Jun 2012
Location: Aberdeenshire, Scotland
Posts: 77
Thanks: 12
Thanked 9 Times in 9 Posts
Likes: 40
Liked 14 Times in 11 Posts
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...
__________________
Pictures on Flickr
https://www.flickr.com/photos/scotts_photies/
Reply With Quote
The Following User Says Thank You to Scottwin For This Useful Post:
RobEW (2 Weeks Ago)
  #8  
Old 2 Weeks Ago
Ricoh Ricoh is offline
Full member
 
Join Date: Apr 2014
Location: Lancashire
Posts: 4,581
Thanks: 491
Thanked 348 Times in 310 Posts
Likes: 591
Liked 1,318 Times in 801 Posts
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.
__________________
Steve

on flickr
Reply With Quote
The Following User Liked This Post:
RobEW (2 Weeks Ago)
  #9  
Old 2 Weeks Ago
IainMacD's Avatar
IainMacD IainMacD is offline
Full member
 
Join Date: Mar 2008
Location: Drumnadrochit
Posts: 3,380
Thanks: 1,163
Thanked 503 Times in 452 Posts
Likes: 1,424
Liked 605 Times in 197 Posts
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
__________________
Iain

E-M5 II, E-M1, 7.5, 8-18, 12-40, 17, 40-150, 45, 60, 300

Website
Flickr
Reply With Quote
The Following User Says Thank You to IainMacD For This Useful Post:
Ricoh (2 Weeks Ago)
The Following Users Liked This Post:
Ricoh (2 Weeks Ago), RobEW (2 Weeks Ago)
  #10  
Old 2 Weeks Ago
MikeOxon MikeOxon is offline
Full member
 
Join Date: Nov 2017
Location: oxford
Posts: 199
Thanks: 19
Thanked 44 Times in 38 Posts
Likes: 27
Liked 68 Times in 44 Posts
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."
__________________
Mike
visit my Natural History Photos website:
http://home.btconnect.com/mike.flemming/
Reply With Quote
The Following User Says Thank You to MikeOxon For This Useful Post:
RobEW (2 Weeks Ago)
  #11  
Old 2 Weeks Ago
RobEW RobEW is offline
Full member
 
Join Date: Feb 2017
Location: Nottingham
Posts: 1,113
Thanks: 123
Thanked 31 Times in 30 Posts
Likes: 641
Liked 82 Times in 59 Posts
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.
Reply With Quote
  #12  
Old 2 Weeks Ago
RobEW RobEW is offline
Full member
 
Join Date: Feb 2017
Location: Nottingham
Posts: 1,113
Thanks: 123
Thanked 31 Times in 30 Posts
Likes: 641
Liked 82 Times in 59 Posts
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.
Reply With Quote
  #13  
Old 2 Weeks Ago
MJ224's Avatar
MJ224 MJ224 is offline
Full member
 
Join Date: May 2016
Location: Carmarthenshire
Posts: 6,434
Thanks: 409
Thanked 308 Times in 292 Posts
Likes: 2,871
Liked 1,350 Times in 696 Posts
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..............
__________________
My Sailing Page

My Flickr
Reply With Quote
The Following User Liked This Post:
RobEW (2 Weeks Ago)
  #14  
Old 2 Weeks Ago
Zuiko's Avatar
Zuiko Zuiko is offline
Administrator
 
Join Date: Nov 2007
Location: Dunmow, Essex
Posts: 20,635
Thanks: 1,906
Thanked 2,942 Times in 2,282 Posts
Likes: 2,839
Liked 3,787 Times in 1,777 Posts
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.
__________________
John

"A hundredth of a second here, a hundredth of a second there even if you put them end to end, they still only add up to one, two, perhaps three seconds, snatched from eternity." ~ Robert Doisneau
Reply With Quote
The Following User Says Thank You to Zuiko For This Useful Post:
RobEW (2 Weeks Ago)
  #15  
Old 2 Weeks Ago
RobEW RobEW is offline
Full member
 
Join Date: Feb 2017
Location: Nottingham
Posts: 1,113
Thanks: 123
Thanked 31 Times in 30 Posts
Likes: 641
Liked 82 Times in 59 Posts
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!
Reply With Quote
The Following Users Liked This Post:
MikeOxon (2 Weeks Ago), OM USer (2 Weeks Ago), Zuiko (2 Weeks Ago)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Some beach long exposures Kiwi Paul Foto Fair 12 20th November 2013 02:27 PM
Long exposures at the beach Kiwi Paul Foto Fair 3 8th November 2013 10:19 AM
Is E5 better with looong exposures than E30? Ross the fiddler Olympus E-5 6 14th November 2010 12:43 PM
Any multi-exposures from E30? Ross the fiddler Olympus E-30 5 5th August 2010 10:25 PM
Playing with long exposures jonesy Foto Fair 11 3rd November 2009 03:57 PM


All times are GMT. The time now is 11:43 AM.


The Write Technology Ltd, 2007-2018, All rights reservedAd Management plugin by RedTyger