Shutter Speed vs Exposure Time

Before im blased i know these are the same thing, However veiwing the EXIF on a shot taken with my 40D using Right Click > Properties > Summary > Advanced the Shutter Speed and Exposure Time tend to be different.

For the shot below i had it set to 1/40th of a second however veiw the EXIF and the Shutter Speed shows 1/41 and Exposure Time shows 1/40th I have also sometimes had much greater diferences between the two and have often had weird shutter speeds in sports mode etc (Such as 1/562 etc)

Any ideas why??

EXIF should be intact.

Thanks

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Have a read here and see if it helps.

:S weird...your Exif data looks strange compaired to my 40D exif data...
things are missing from yours.

One is the setting you applied in the camera, the other is the exact value. The camera and lenses aren't mechanically precise enough to match exactly every time.

Whats missing? Shows no gaps when veiwed here. Also it shows apeture at f5.7 it was at 5.6 That link doesnt make much sense to me could someone please dumb it down a bit??

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cdifoto wrote in post #4237608
One is the setting you applied in the camera, the other is the exact value. The camera and lenses aren't mechanically precise enough to match exactly every time.

Thanks very much cdifoto

NSWESP wrote in post #4237619
That link doesnt make much sense to me could someone please dumb it down a bit??

By my reading, shutter speed and exposure time begin the same, but because of the way the information is stored, there is a slight variation. In one case, a log function is invoked, and this is then truncated; in the other, the value is stored as a real number directly (also of finite precision). Conversion of these possibly slightly different stored values to the conventional form 1/x, (especially when x will be rounded to an integer) may result in different values being displayed.

I'm not sure if that helps more or not.

Just confuses me more lol But i think ive got it, However i dont get the weird shutter times in sports mode.

The best answer then is probably "Don't worry about it - it makes no real difference."

1/60s is not exactly two times longer than 1/125, but we use it all the time.
Photographers always work with rounded numbers; EXIF shows both of them: rounded, ‘photographical’ numbers, and real values.

Thanks guys but the really really weird numbers in sports mode is still un answered?

Just looked at another shot and its 1/250th and 1/256th so there are some decent gaps. Is this only in the lower range cameras or do 1D series still do this??

NSWESP wrote in post #4237738
Thanks guys but the really really weird numbers in sports mode is still un answered?

Which really weird numbers in Sports mode are you talking about?
Give us an example.
Don’t just throw some numbers off the top of your head, show us the picture with EXIF that shows them..

Let me find some then i will... I have some somewhere.

Ok found one, But its shutter Speed = 1/256 and Exposure = 1/250 so nothing too strange.