# DOF and Cropping take 2

Started Feb 11, 2014 | Discussions thread
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 U R Slippery II In reply to Ian Stuart Forsyth, Feb 12, 2014

Ian Stuart Forsyth wrote:

awaldram wrote:

moving_comfort wrote:

awaldram wrote:

moving_comfort wrote:

awaldram wrote:

As far as I;m concerned both you and Ian have had ample proof of the error of your (and only your) crackpot theories.

So, everyone who understands and discusses equivalence - like Falk Lumo, Joseph James, etc and everyone viewing this thread who understands it are crackpots?

I think I'll invite Mr James to this thread - head crackpot, in your view - he probably likes a good laugh as much as anyone.

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So I'm done here you obviously can't even understand the maths that prove your wrong are unable to see the truth in images posted by both Ian and Myself

Ian and yourself? Don't you know Ian's trying his best to make you see the light?

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because of your FF centric world , you have no objectivity, even when so obviously wrong to everyone you eventually reach the point your becoming a bit of a joke.

Equivalency is not tied to "FF", it applies between every existing format size. It applies just as much between Q and 645D as it does between aps-c and FF. Don't try to make this a 'FF good, aps-c bad' argument. It simply describes a relationship, and in practice can describe a lens/sensor combo that might work better for someone than another lens/sensor combo. That's it. Don't take it so personally, it's an equation.

An equation that proves your wrong , as has been posted by James .

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Really? Can you show me where James showed how equivalence proved me wrong?I think he'd be as suprised to hear that he did that as me

(I think you're attributing some of what he was writing incorrectly, by the way - but I'll let him speak for himself.)

I'm sure James is completely aware what is formula shows and the relationship to view size , Magnification , Focal length and sensor size.

But I can do better how about Bob Atkins ?

Andrew, If you recall, I'm the one who brought his cliff's notes into the thread (and the previous thread.)

Nice try, though.

By the way, can you explain how you changed your story on this answer you gave below?

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You changed your story on that, which represents progress  - what made you change?

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