EXIF question - Different values from different progs with same photo? (eg: Focal Length)

NeilF

NeilF

NeilF

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I've looked at the same image in Windows properties, and using a VB application, and the values seem to not match? Anyone shed any light on this? I'm hoping the values in the VB application are correct, just shown in a different way?

In particular:-
Exposure Time: 0.0435s vs 1/125 sec
Focal Length: 8.5 vs 34 mm

Also I noticed ISO is not set for any of my photos in the EXIF values? Is this normal? Is it a waste of time showing it?

exif1.gif
 
Last edited:
robertgilbert86 said:
ISO is always recorded in my EXIF so should be in yours too. What OS are you on? Looks a bit retro from here.

I can't help but think this doesn't matter...
Click to expand...

Windows XP..


Using http://regex.info/exif.cgi on the image I get:-
Exposure Time: 1/125
Focal Length: 34mm
ISO: 100


Given the first two, does an exposure of 1/125 in anyway relate to 0.0435s? Or does a focal length of 34mm in anyway related to 8.5?
 
NeilFawcett said:
Windows XP..


Using http://regex.info/exif.cgi on the image I get:-
Exposure Time: 1/125
Focal Length: 34mm
ISO: 100


Given the first two, does an exposure of 1/125 in anyway relate to 0.0435s? Or does a focal length of 34mm in anyway related to 8.5?
Click to expand...

I don't know about the shutter speed, but with regards to the focal length it could be that if you're using a small sensor point and shoot, the true focal length of the built in lens is 8.5mm, but the 35mm equivalent (Full frame sensor) could be 34mm.
 
Xenoxide said:
I don't know about the shutter speed, but with regards to the focal length it could be that if you're using a small sensor point and shoot, the true focal length of the built in lens is 8.5mm, but the 35mm equivalent (Full frame sensor) could be 34mm.
Click to expand...

This is a photo taken with a Nikon D90!

I was hoping the values were technically correct, but just needed some jigging somehow?
 
D.P. said:
The values are way out.
Click to expand...

I've changed to another VB DLL and I'm getting better looking data!

As regards the focal length? This might explain something:-
Code: 
$focal_multiplier = 3.94366197; // Use this to configure the multiplier used to convert to 35 mm equivalent scale.
 
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