I made no mention whatsoever of the differences between viewfinders. I
was only pointing out that DoF characteristics are visible in the
viewfinder as well as the final print. That's why we have DoF preview
buttons.
Chuck Norcutt
Ken Norton wrote:
>> Would you like to rethink that statement? What ends up on the
>> film/sensor and ultimately in the print from a detail standpoint is the
>> same set of light rays that passes through the viewfinder. If there's
>> greator DoF in the print there was greater DoF in the viewfinder.
>
> I rethunk it. I stand on that statement 100%. A cropped viewfinder
> image doesn't change DoF at all. A 50mm lens casts the same DoF
> characteristics in a 1:1 viewfinder no matter the film/sensor format.
> It's just that the entire viewfinder image in a Fourthirds camera is
> 1/4 the surface area of an OM viewfinder image.
>
> Where I think you might be confused in this is that a 25mm focal
> length is roughly the equivalent in FourThirds as 50mm focal length is
> in an OM. If comparing a 25mm lens on FourThirds to a 50mm lens on an
> OM, you are correct. But what I was saying is that the exact same lens
> on either format will produce the exact same DoF characteristics for
> focusing.
>
> Think of it this way, if you masked out 75% of the viewfinder image in
> your 5D, does it change the DoF characteristics of the lens on the
> camera? Of course not.
>
> AG
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