Re: Paired shots from different focal lengths Wm Carter comment (digest 1504)

[P3D Eric Goldstein <egoldste@xxxxxx>]

P3D Bob Howard wrote:

> On the surface this is true BUT we also jiggled the images to the same
> image size and DEPTH OF FIELD IS EQUAL AT THE SAME F/STOP AT THE SAME
> MAGNIFICATION REGARDLESS OF FOCAL LENGTH.


This is proven to us 2-1/4 Rolleiflex shooters who also use the 35 mm
"rolleikin" attachment, which utilizes only a portion of the medium
format lens coverage for the smaller film format.

When shooting 120, the 75 or 80 millimetre lens yields a "normal"
magnification and perspective. Yet, when "cropping in" by fitting the 35
mm attachment, we achieve "portrait length" DOF and perspective from the
same lens.

So when the subject to camera distance and lens focal length remain
constant, the effect of the "longer" lens (magnification, DOF,
perspective) on the smaller film format is achieved by "cropped in" on
the image area.

> My what tangled webs we weave! (Robt. Burns approx.)

approximately or apology?   8)


Eric G.


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End of PHOTO-3D Digest 1505
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