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[OM] Re: Figuring out depth of field with 4/3 adaptor

Subject: [OM] Re: Figuring out depth of field with 4/3 adaptor
From: Chris Barker <ftog@xxxxxxxxxxxxxxxx>
Date: Sun, 27 Mar 2005 20:58:47 +0100
I wish I could elucidate Walt, but I am waiting as well ... ;-)

Chris

On 27 Mar 2005, at 19:20, Walt Wayman wrote:

> This is my understanding, and I hope I can explain it without sounding 
> too dumb.
>
> A 24mm lens is a 24mm lens is a 24mm lens.  Even if you epoxy the 
> sucker for a hood ornament on a three-door Edsel dump truck, it's 
> still a 24mm lens.  It is an inanimate object, always unaware, forever 
> unable to alter any of its physical characteristics.  Therefore, it 
> always and forever projects the same image out its behind relative to 
> the scene in front of it, meaning, assuming the lens-to-film (or 
> sensor) distance is correct, even the foot/meter distance scale will 
> be correct, and, obviously, the COC, DOF and FOV will be the same.  
> Just because you're capturing only half the image circle (a.k.a FOV) 
> doesn't make one iota of difference in the characteristics of the 
> image the lens projects.  It doesn't know if it's been attached to an 
> Olympus E-1 or, by use of a bag bellows and a recessed lensboard, to a 
> Sinar P2 8x10, or even hung as an ornament on a Christmas tree.
>
> Walt, awaiting correction and profoundly elucidating clarification of 
> the correction
>


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