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'[EE]: Searching for a serial camera (rs232) or (I2'
2002\11\11@140317 by William Chops Westfield

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   >Of course, you'd need an optic system, but I'm planning
   >on buying a few old webcams to get the lenses and such.

   Don't do that ... go down to your local photographic shop which
   has on site developing, and get the bodies of disposable cameras
   after they have taken the film out. They will probably give you
   all you can take for free. You will have any number of lenses of
   suitable size for as long as you want then.

The lenses in disposable cameras are designed to provide a reasonable
field of view when covering the area of 35mm or 25mm piece of
photographic film (20 to 45mm focal lengths.)  If you use them with
the (much smaller) semiconductor sensors, you'll get a significant
telephoto effect (The lens in most webcams is something like 6mm
focal length.)  This might be OK, or it might not...

BillW

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2002\11\11@141557 by D. Jay Newman

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face
> The lenses in disposable cameras are designed to provide a reasonable
> field of view when covering the area of 35mm or 25mm piece of
> photographic film (20 to 45mm focal lengths.)  If you use them with
> the (much smaller) semiconductor sensors, you'll get a significant
> telephoto effect (The lens in most webcams is something like 6mm
> focal length.)  This might be OK, or it might not...

I'll have to experiment.

Thanks much!
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2002\11\11@145852 by Peter L. Peres

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On Mon, 11 Nov 2002, William Chops Westfield wrote:

*>The lenses in disposable cameras are designed to provide a reasonable
*>field of view when covering the area of 35mm or 25mm piece of
*>photographic film (20 to 45mm focal lengths.)  If you use them with
*>the (much smaller) semiconductor sensors, you'll get a significant
*>telephoto effect (The lens in most webcams is something like 6mm
*>focal length.)  This might be OK, or it might not...

Assuming you use the same film or object plane distance as the original
with the new detector. The term of comparison is the ratio between focal
distance and image size. F.ex. a f=50mm 35mm slide lens is equivalent with
a 1/3in CCD (~= 10.6mm) using a lens with f= 50/35 * 10.6 ~= 15 mm. A 50mm
slide lens would be a portrait lens. By equivalent I mean the same field
of view.

Peter

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