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Exif code for dummies

winthrop

Thousand Oaks, US
295 posts

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winthrop Silver Member Charter Member
Tue 28-Feb-12 11:54 PM

Can anyone explain how I would translate this 

<exif:SubjectDistance>4294967295/1</exif:SubjectDistance>

into something I might understand?

This is from an old D70 photo but I've seen the same thing in
data from my D700.

Anyone have a clue?

Bob

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LunaC

US
2 posts

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#1. "RE: Exif code for dummies" | In response to Reply # 0

LunaC Registered since 24th Jun 2010
Wed 29-Feb-12 02:37 AM

I'd presume infinity focus

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winthrop

Thousand Oaks, US
295 posts

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#2. "RE: Exif code for dummies" | In response to Reply # 1

winthrop Silver Member Charter Member
Wed 29-Feb-12 02:43 AM

Thanks.

That was sorta kinda my thought, but it's such an odd number. I would think that a simple one billion over one would do it?

Bob

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bclaff

Vancouver (WA USA not BC Canad, US
9691 posts

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#3. "RE: Exif code for dummies" | In response to Reply # 2

bclaff Awarded for multiple contributions for the Resources Registered since 25th Oct 2004
Wed 29-Feb-12 03:49 AM

It's the computer equivalent of unsigned integer infinity.
In hexadecimal it's 0xFFFFFFFF.


Bill

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Antero52

Vantaa, FI
2683 posts

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#4. "RE: Exif code for dummies" | In response to Reply # 3

Antero52 Silver Member Awarded for his expertise in post-processing, being  consistently helpful and professional. Nikonian since 07th Jul 2009
Wed 29-Feb-12 04:36 AM

>It's the computer equivalent of unsigned integer infinity.
>In hexadecimal it's 0xFFFFFFFF.
>
In other words, it's the biggest number that can be expressed with 32 bits.

Regards, Antero

briantilley

Paignton, UK
30235 posts

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#5. "RE: Exif code for dummies" | In response to Reply # 4

briantilley Gold Member Deep knowledge of bodies and lens; high level photography skills Donor Ribbon awarded for his support to the Fundraising Campaign 2014 Nikonian since 26th Jan 2003
Wed 29-Feb-12 06:11 AM | edited Wed 29-Feb-12 06:12 AM by briantilley


>In other words, it's the biggest number that can be expressed
>with 32 bits.

That's a good, simple way of putting it - thanks!

Here's another way - 4294967295 is 2 to the power of 32 minus one. However we describe it, it's the camera's way of saying "infinity focus"

Brian
Welsh Nikonian

ajdooley

Waterloo, US
3372 posts

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#6. "RE: Exif code for dummies" | In response to Reply # 5

ajdooley Gold Member Nikonian since 25th May 2006
Wed 29-Feb-12 11:12 AM

I keep telling anyone who will listen that these darned things are noting but computers with lenses, like our new car is a computer with a gas pedal. Years ago the 7th Fleet Commander (a 3-star admiral) told me of life: "Too many moving parts."

Alan
Waterloo, IL, USA
www.proimagingmidamerica.com

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winthrop

Thousand Oaks, US
295 posts

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#7. "RE: Exif code for dummies" | In response to Reply # 6

winthrop Silver Member Charter Member
Wed 29-Feb-12 12:09 PM

Thanks all. I knew you folks would have the answer!

Bob

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G