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DPChallenge Forums >> Hardware and Software >> ISO missing from EXIF data
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06/18/2006 12:28:35 AM · #1
The EXIF data from my Canon S2 IS and Canon S400 does not seem to contain the ISO data. When reviewing the data in PhotoShop it is not listed. Any idea why?
06/18/2006 12:37:15 AM · #2
Don't know but I get the same thing when I look at the EXIF data from my old G5 photos. Maybe if you had the ISO set on 'Auto' then it doesn't print the number?
06/18/2006 12:49:50 AM · #3
I used my G3 last weekend and shot RAW using manual mode. ISO is shown in the Bridge. I don't know about jpeg.

What camera mode were you using? (I know the S1 IS doesn't have raw)

As suggested, if using Auto or P mode it may not show up.

Message edited by author 2006-06-18 00:51:10.
06/18/2006 01:47:07 AM · #4
Try using another program to read the EXIF. There are many freeware downloads available that are intended for exactly that purpose. I use IrfanView. For my 20D it will tell what exposure mode was used.
06/18/2006 07:06:58 AM · #5
Some programs only show a subset of the available information. If you are using Windows XP, you can view the complete list of image properties.

Right click on the image file, then select properties. Click on Summary, and then click the "Advanced>>" button.

If it's not there under any name, it's not stored in the image.
06/18/2006 10:32:20 AM · #6
Originally posted by surfdabbler:

Some programs only show a subset of the available information. If you are using Windows XP, you can view the complete list of image properties.

Right click on the image file, then select properties. Click on Summary, and then click the "Advanced>>" button.

If it's not there under any name, it's not stored in the image.


Even this doesn't show me the ISO for my D70 shots. I have try to remember what ISO I used.
06/18/2006 10:33:06 AM · #7
I'd be REALLY surprised if a camera records EXIF info WITHOUT including the ISO. Can you post an original pic file somewhere that we can all download and have a look? Or, PM me and I'll give you an address where you can send one to me. I'll have a look.
06/18/2006 10:40:43 AM · #8
The root of the problem is that some cameras store the ISO setting in the "Maker Notes" section or elsewhere where EXIF readers don't know where to look for it. For the life of me, I can't understand why they do this, unless it's a lame attempt to get you to install & use *their* software, which of course *does* know where to look :-P
06/18/2006 10:42:53 AM · #9
Originally posted by surfdabbler:

Some programs only show a subset of the available information. If you are using Windows XP, you can view the complete list of image properties.

Right click on the image file, then select properties. Click on Summary, and then click the "Advanced>>" button.

If it's not there under any name, it's not stored in the image.

Just now compared using a recent shot from my 20D:
--Windows xp displays 20 items of EXIF info.
--EOS Viewer utility displays 44 items of EXIF info, 18 of which are Canon Custom Function settings.
--IrfanView displays 66 items of EXIF info.

06/18/2006 10:46:51 AM · #10
Originally posted by strangeghost:

I'd be REALLY surprised if a camera records EXIF info WITHOUT including the ISO. Can you post an original pic file somewhere that we can all download and have a look? Or, PM me and I'll give you an address where you can send one to me. I'll have a look.


Maybe my camera stores it and, as suggested, certain programs don't show this info.

Anyway John, I PM'd you to take you up on your offer to check out the original files.
06/18/2006 10:47:35 AM · #11
Originally posted by surfdabbler:

Some programs only show a subset of the available information. If you are using Windows XP, you can view the complete list of image properties.

Right click on the image file, then select properties. Click on Summary, and then click the "Advanced>>" button.

If it's not there under any name, it's not stored in the image.


I have Windows XP Pro. When I follow these steps on a Nikon RAW file, no EXIF data is shown. Same with a Photoshop PSD file. So it may have something to do with the format of the photo file. If I try it on a JPG file, I get some EXIF data but not all. I think the best advice I've seen here is to use an EXIF viewer. I use Nikon's Picture Project for this. I tried IrfanView and it seems to do a fine job on Nikon Raw and JPG formats. There are others.

Message edited by author 2006-06-18 11:00:33.
06/18/2006 11:40:43 AM · #12
Perhaps the real question here is, if we are looking for EXIF in an image from a Canon S2 IS, why aren't we trying to use the software that came with that camera? That would be ZoomBrowser I believe.
06/18/2006 11:57:16 AM · #13
I've had a Canon S1 and S3 -- IrfanView will read the ISO info on those, but will may report "Auto" if you use that mode, and not the actual value used.

Message edited by author 2006-06-18 11:57:43.
06/18/2006 10:21:55 PM · #14
Originally posted by coolhar:

Just now compared using a recent shot from my 20D:
--Windows xp displays 20 items of EXIF info.
--EOS Viewer utility displays 44 items of EXIF info, 18 of which are Canon Custom Function settings.
--IrfanView displays 66 items of EXIF info.


I sit corrected. :) (I would stand, but it's hard to type that way)
06/18/2006 11:39:07 PM · #15
Originally posted by coolhar:

Perhaps the real question here is, if we are looking for EXIF in an image from a Canon S2 IS, why aren't we trying to use the software that came with that camera? That would be ZoomBrowser I believe.


I never even loaded it. Is there any other reason to use it other than to get my ISO?
06/18/2006 11:53:04 PM · #16
Originally posted by BeeCee:

... Is there any other reason to use it ...

It doesn't cost $650?
06/18/2006 11:58:01 PM · #17
I don't own anything photography-related that cost that much, not even my camera.
06/19/2006 12:28:54 AM · #18
Originally posted by BeeCee:

I don't own anything photography-related that cost that much, not even my camera.
How am I supposed to know if that program has anything that might interest you? But think of it this way - you paid for it when you bought your S2, you apparently don't know what's in it, so why not install it and see what it's got? You can always uninstall it if you don't like/need anything it has to offer. Oh, another thing, there are some updates on the Canon site that may be appropriate.
06/19/2006 02:26:08 AM · #19
Was just asking if it was anything more than a photo browser, which I don't need another of. Sorry for asking!
06/19/2006 02:31:11 AM · #20
I find that if the image is straight from the camera,
Irfanview can tell me the ISO. After it has been saved by Photoshop the ISO info is missing.

06/20/2006 11:15:07 PM · #21
OK, so I installed the Canon software and what do you know? Zoom Browser <u>does</u> report the ISO rating. Thanks very much coolhar.

The Windows XP suggestion did not work by the way.
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