Re: Lunar Illusion


"imipak" <imipak@xxxxxxxxx> wrote in message
news:1119662924.626668.201770@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> The illusion of the moon being larger, when close to the horizon, is
> well-known and well-documented. Explanations are varied and range from
> a page or so of text to entire books. Ptolemy's explanation of the
> illusion was that there is a frame of reference near the ground and not
> in the sky. This explanation is generally held to be the most likely.
>
> The illusion does NOT occur if you close one eye, and also does NOT
> occur when using a conventional modern camera.
>
> This, however, does NOT answer the question of whether the effect
> exists when using a stereoscopic camera. These have existed since
> Victorian times, so somebody has presumably taken a picture of this
> kind. Does anyone know whether the illusion shows up in this case?


Not sure I understand your reasoning here.
(I've taken lots of stereo pairs, so I understand *them* !)

The effect is a naked-eye effect.

If reproduced photographically, then the "size" of the moon is dependant on
focal length, enlargement etc etc; i.e. it is dependant on the reproduced
image size.

Are you suggesting that a stereograph will reproduce the image scale of the
moon larger than a simple single photo? ...or that the combination of the
two images will tend to "enlarge" them?

Sorry.
I'm not making myself clear.

My question:
How could a stereograph perpetuate this illusion?

--
Jeff R.



.

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