The beam of light from a slide projector does not form an 'aerial'
image. When it intersects something solid, it forms a 'real' image. An
aerial image 'sits' in the air without being formed 'on' something. I
can't think offhand of any uses of aerial images in photography. After
all, photography is about forming real images on photosensitive objects.
They are a core part of telescope and microscope design where the
objective forms an aerial image which is then magnified by the eyepiece.
A scanner with the light off or removed could likely scan an aerial
image, but the size of lens and aparatus and the brightness of the
object being imaged required to form an aerial image of sufficient size
and brightness would be outrageous.
Take a look at a high school (or college survey course) physics text to
learn about aerial images. We used to play with this stuff in high
school with 'optical benches' made of meter sticks with simple metal
holders for candles and lenses.
Moose
Marten Beels wrote:
Could a flat bed scanner focus on an airial image?
Yes
If I disabled the lamp on a flatbed scanner and then
focused an image from a slide projector at the plane
of the scanner's glass would the scanner be able to
focus on and capture the image?
No
Chuck Norcutt
Woburn, Massachusetts, USA
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