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01-27-2009, 05:29 AM   #1
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PnS camera's focal length do not tally with exif?

When I am using my PnS, I observed that the exif focal length information is always incorrect. Say if I am using a 200mm focal length, it will report something like 6.2mm. How do I rectify this issue?

01-27-2009, 06:24 AM   #2
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many PnS focal lengths are indicated in 35mm equivelent for the user, but in exif are reported as actual,
01-27-2009, 04:38 PM   #3
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Thanks Lowell.

But this is a major problem if we try to put a border frame (with exif information) on the picture. The exif's focal length info is just weird.

I am using a fuji s6500fd by the way and in 35mm terms, its focal length is from 28mm to 300mm. Why would the exif report something like 6.2mm?

Is there any software that can translate/convert this 6.2mm to a more meaningful 35mm terms?

Thanks
01-28-2009, 05:41 AM   #4
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QuoteOriginally posted by raider Quote

Is there any software that can translate/convert this 6.2mm to a more meaningful 35mm terms?

Thanks
Do you really need any software? If 6.2mm from EXIF is the wide end of the lens (28mm equivalent), all you need to do is multiply the focal length by 4.5.
The same as with APS-C sensor, just slightly bigger 'crop factor'

01-28-2009, 06:47 AM   #5
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QuoteOriginally posted by raider Quote
I am using a fuji s6500fd by the way and in 35mm terms, its focal length is from 28mm to 300mm. Why would the exif report something like 6.2mm?
Because that is the actual focal length of the lens.

QuoteQuote:
Is there any software that can translate/convert this 6.2mm to a more meaningful 35mm terms?
The EXIF should contain a field named "FocalLengthIn35mm", which contains what you want. I don't know if the software you use to make the frame can be customized to use this field instead.

Otherwise, you could use a script (or batch file) using ExifTool to modify the focal length field to what you want.

Last edited by RBellavance; 01-28-2009 at 08:50 AM.
01-28-2009, 08:26 AM   #6
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I use PSP X2 and it shows both real focal length in mm and 35mm equivelent in the EXIF data.
01-28-2009, 04:28 PM   #7
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I use faststone image viewer and irfanview. Both did not show the correct focal length. The real hassle I face is when I tried to put a border frame (with EXIF info) on the photo.
01-29-2009, 05:35 PM   #8
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Actually I just noticed this same thing looking at my sister's photos and trying to help her out with her new p&s. We we viewing in windows viewer and I thought that was why. I didn't know that irfanView and Faststone presented the same way. I wonder why too.

02-11-2009, 08:40 PM   #9
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I just checked a file from our Ricoh GX and in Faststone it didn't have a "35mm equivalent" value. Haven't got it installed here, but wondering if PhotoMe (or similar) that show all EXIF info would show a field with it in.
02-12-2009, 12:57 AM   #10
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Actually, I do think it is listed in Irfanview.
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