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'[OT] The secret to taking sharp pictures of circui'
2009\03\20@203151 by Peter

picon face
Picbits Sales <sales <at> picbits.co.uk> writes:
> Another good way is to bung it on your flatbed scanner if it has decent
> optics and can focus at objects further than its own glass.

I have bad experiences with scanners used for this. Even a photo left in its 3mm
glass frame (too old to remove) was scanned out of focus and I had to pry it
out. Brand name scanner, 1200 real dpi and still ...

Depth of field is extremely closely related to lighting and numeric aperture.
Usually scanner optics don't have anything resembling a diaphragm so they use
the full aperture and good bright color-true light is expensive and short-lived
so you  get *very* shallow depth of field.

Please do not confuse contemporary led-lit full row ccd sensor scanners with 1kW
xenon-lit photocopiers and ancient flying spot scanners which *did* have
respectable depth of field because of loose optics, small numerical aperture and
oodles of light. Point in (lower) ... cheek:

http://www.youtube.com/watch?v=h_grO7H2FD8
(warning grainy content: http://mefeedia.com/entry/how-to-photocopy/13905392)

Peter


2009\03\21@091459 by Djula Djarmati

flavicon
>> Another good way is to bung it on your flatbed scanner if it has decent
>> optics and can focus at objects further than its own glass.
>
> I have bad experiences with scanners used for this. Even a photo left in its 3mm
> glass frame (too old to remove) was scanned out of focus and I had to pry it
> out. Brand name scanner, 1200 real dpi and still ...
>
> Depth of field is extremely closely related to lighting and numeric aperture.
> Usually scanner optics don't have anything resembling a diaphragm so they use
> the full aperture and good bright color-true light is expensive and short-lived
> so you  get *very* shallow depth of field.
>
> Please do not confuse contemporary led-lit full row ccd sensor scanners with 1kW
> xenon-lit photocopiers and ancient flying spot scanners which *did* have
> respectable depth of field because of loose optics, small numerical aperture and
> oodles of light. Point in (lower) ... cheek:
>
> http://www.youtube.com/watch?v=h_grO7H2FD8
> (warning grainy content: http://mefeedia.com/entry/how-to-photocopy/13905392)

The copier on that clip has no need for large depth of field...

Perhaps you are talking about this model?
http://www.youtube.com/watch?v=ppyq7LWtbyY

Djula

2009\03\24@115136 by Robert Young

picon face


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I think you may be confusing the bellows extensions used for macro work on SLR/dSLR with a true shift capable lens.  That said, I wonder if you could modify such a unit.  The next problem after that is having sufficient image circle on on the lens so that you can shift and work away from center.  At magnification greater than 1, this does become somewhat easier as the lens can start to be a good distance away from the camera.

Switched topic tag to OT as we are, in my opintion, drifting away from the original intent of "cheap" camera and straight-up shots...

Rob

2009\03\24@180245 by Michael Algernon

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face
Be careful BG or you may be labeled as "silly" by Olin.
MA

{Quote hidden}

 WFT Electronics
Denver, CO   720 222 1309
" dent the UNIVERSE "

All ideas, text, drawings and audio , that are originated by WFT  
Electronics ( and it's principals ),  that are included with this  
signature text are to be deemed to be released to the public domain as  
of the date of this communication .

2009\03\24@180643 by Benjamin Grant

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face
well, fortunately for me i have been labeled as a future mcdonald's employee
by Olin, so I've moved beyond worrying about sir Olin's opinion.

On Tue, Mar 24, 2009 at 6:02 PM, Michael Algernon <.....picKILLspamspam.....nope9.com> wrote:

{Quote hidden}

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