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Olympus E-5 E-5 specific discussion.

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  #1  
Old 20th December 2010
Makonde
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EXIF - Subject Distance

I see that my E-5 records distance to subject in the EXIF. This is very useful information in many shots! (especially correlating with aperture to think about how DOF might have been different). My E520 didn't do that - how about the E3? Or is this a new feature unannounced?!
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Old 20th December 2010
Bo_Nydahl Bo_Nydahl is offline
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Re: EXIF - Subject Distance

Just checked an E3 shot and I cannot see any distance information.

Mike
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Old 20th December 2010
Ulfric M Douglas Ulfric M Douglas is offline
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Re: EXIF - Subject Distance

The first time I noticed that info in an EXIF was yesterday : viewing a blog with great photos from a "Russia for the Russians" demo in Red Square, Moscow, linked from a TP forum thread.
The very excellent pictures were taken with a Canon5D2&Fast lens.

I'm guessing the "distance" EXIF stuff is inserted by "professional" cameras ...
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Old 20th December 2010
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Re: EXIF - Subject Distance

The E-3 certainly includes this, click to the gallery and see

.

It is upto the raw engine whether this is shown (DxO does, Master didn't, nor does Viewer 2 for the E-3)

Nick
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Old 20th December 2010
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Re: EXIF - Subject Distance

Quote:
Originally Posted by Makonde View Post
My E520 didn't do that - how about the E3?
I think your E520 did - as mine does!

When looking at the full EXIF output of my files there is a MakerNote for "Focus Distance". See this page for more info EXIV2

Looking at some of my recent shots I see figures reported such as "915/10". Judging from my shots this figure seems to be mm/10. I would have to conduct a test to confirm this hypothesis. I also looked at a shot I took with a manual focus OM macro lens and the distance was reported as "0/10" - no surprise there!

I suspect that many of the 4/3 cameras have this info but some image software progams don't bother providing it.
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Old 20th December 2010
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Re: EXIF - Subject Distance

Thanks for the replies. Interesting. As the info is rather useful for post-mortems I'm a bit surprised to learn that it's there but not always extracted! I'm using ACR/Photoshop for both cameras...
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Old 20th December 2010
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Re: EXIF - Subject Distance

I am assuming Lightroom doesn't show this...?
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Old 20th December 2010
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Re: EXIF - Subject Distance

That would be correct John.
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Old 21st December 2010
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Re: EXIF - Subject Distance

Well worth having a look at Phil Harvey's ExifTool or a development which uses it in a graphical user interface ExifToolGUI
It seeks to find all the hidden information that there is to be read, and then display it in an accessible format.
The accuracy of the focus distance information embedded is a bit iffy sometimes though.
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Old 21st December 2010
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Re: EXIF - Subject Distance

Quote:
Originally Posted by Nick Temple-Fry View Post
The E-3 certainly includes this, click to the gallery and see

.

It is upto the raw engine whether this is shown (DxO does, Master didn't, nor does Viewer 2 for the E-3)

Nick
Kuso Exif Viewer V3.0 tells me its 4.44 m.
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Old 21st December 2010
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Re: EXIF - Subject Distance

Quote:
Originally Posted by peak4 View Post
The accuracy of the focus distance information embedded is a bit iffy sometimes though.
indeed - very iffy!
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Old 21st December 2010
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Re: EXIF - Subject Distance

Quote:
Originally Posted by peak4 View Post
information embedded is a bit iffy sometimes though.
Really? Are you sure?

I think there would be two possibilities:

1. the EXIF "Focus Distance" is taken from the calculation used to determine the Autofocus or Manual focus point.

OR

2. the EXIF "Focus Distance" is taken from some other arbitrary measurement/calculation.

If the EXIF "Focus Distance" is taken from 1. then data presented should be accurate otherwise our photos would all be out of focus.

If the EXIF information is taken from some other source then I could see it could be inaccurate but why would Olympus do it that way? The calculation is already done by the camera no need to do it again.

A quick analysis of my previous indoor shots suggests the distance is reported correctly (but that isn't definitive).
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Old 21st December 2010
Jim Ford Jim Ford is offline
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Re: EXIF - Subject Distance

Quote:
Originally Posted by peak4 View Post
The accuracy of the focus distance information embedded is a bit iffy sometimes though.
'Jeffrey's EXIF Viewer' says:

"At 4.4m
Warning: Olympus camera focus-distance data is often erroneous"

Jim
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Old 21st December 2010
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Re: EXIF - Subject Distance

14 and a half foot, seems like an overestimate to me of a couple of feet.

Nick
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Old 22nd December 2010
photo_owl photo_owl is offline
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Re: EXIF - Subject Distance

Quote:
Originally Posted by fitheach View Post
Really? Are you sure?

I think there would be two possibilities:

1. the EXIF "Focus Distance" is taken from the calculation used to determine the Autofocus or Manual focus point.

OR

2. the EXIF "Focus Distance" is taken from some other arbitrary measurement/calculation.

If the EXIF "Focus Distance" is taken from 1. then data presented should be accurate otherwise our photos would all be out of focus.

If the EXIF information is taken from some other source then I could see it could be inaccurate but why would Olympus do it that way? The calculation is already done by the camera no need to do it again.

A quick analysis of my previous indoor shots suggests the distance is reported correctly (but that isn't definitive).
I think you may be missing the bigger picture

All exif data representations involve third parties establishing the meaning of the manufacturers meta data, and then representing it as results for the user. Olympus, in line with other manufacturers, doesn't provide an instruction book!

To see just how one EXIF viewer developer worked with some early Oly users to work out what was where and how it might be decoded - including the AF distance - you can look at this old thread

http://forums.dpreview.com/forums/re...2748188&page=1

so there is some art in the science as well.
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