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Old Aug 4, 2010, 3:38 AM   #1
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Default photocopying

what's the best camera for photocopying texts from journals,newspaper ?

could we post a sample-text here, people print it with their printer,
copy it with their digital camera and post the result ?
(or has it been done already ?)
Also : how long does it take to make -say- 100 photocopies
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Old Aug 4, 2010, 4:11 AM   #2
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unless you need a camera for other things apart from copying text, just buy a good fast scanner (they are cheap now) and be done with it. Using a scanner will be cheaper, faster and easier, than setting up a camera and lighting and transferring images to a computer.
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Old Aug 4, 2010, 4:36 AM   #3
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Quote:
Originally Posted by fotocopy View Post
what's the best camera for photocopying texts from journals,newspaper ?
The CCD array in a scanner or the drum in a photocopier.

Is there a particular reason you want to use a camera for
this? It is not easy to focus a full page onto the very small
image sensor of a camera without introducing some image
distortion. The long linear type of sensor used in scanners
will always do a better job.

Quote:
Also : how long does it take to make -say- 100 photocopies
A fast DSLR will record several images per second at full
resolution. Writing to a relatively slow memory card is the
speed bottleneck.
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Old Aug 4, 2010, 5:20 AM   #4
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Quote:
Originally Posted by fotocopy View Post
Also : how long does it take to make -say- 100 photocopies
It will take you longer to turn the pages than it will to take the photos, so the camera won't be the bottleneck there. If you put a stack of documents in the automatic document feeder of an inexpensive scanner, you'll get better images faster than you would with a digital camera.

Perhaps you can go into more detail about what you wnat to do, but from what you've said so far, there are lots of reasons why a scanner is a better idea than a camera.
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Old Aug 4, 2010, 7:19 AM   #5
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you can't take so well a scanner with you - too big,
and a computer is needed.
e.g. library etc.


also IMO a good test for the quality of a camera
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Old Aug 4, 2010, 7:45 AM   #6
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To do a proper job of photographing text documents with a camera you would need a copy stand to hold the camera steady and parallel to the document. You would also need a lighting system as most indoor locations wouldn't have enough light to take good photographs. http://www.bhphotovideo.com/c/produc...t_Halogen.html

The Hollywood image of the spy taking photos of documents with the Minox camera is misleading! http://en.wikipedia.org/wiki/Minox
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Old Aug 4, 2010, 8:06 AM   #7
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maybe someone can try it ... the best photocopy wins ...
(newspaper-article, normal room-light, no stativ, less than 10sec.)
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Old Aug 4, 2010, 5:24 PM   #8
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Who are you? Some kind of novice spy?
Get a Canon S90 (f/2.0 for low light).
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Old Aug 4, 2010, 5:57 PM   #9
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Are you trying to copy the entire newspaper page? A typical broadsheet that is about 24 inch by 30 inch is over 60 megapixels at 300 pixel/inch! This is a piece of cake for a scanner but you're into medium format territory with a camera. You can start reducing the pixel/inch but you will reach a point where Nyquist artifacts will make the characters illegible. http://en.wikipedia.org/wiki/Nyquist_frequency

Lighting is critical as well. The built-in flash will probably cause a glare spot, especially on glossy magazine stock, because of it's close proximity to the lens. Two lights should be used to create even lighting. If the lights are too high they will cause glare spots, too low and you may bring out the rough texture of newsprint. Ambient light will most likely result in slow shutter speeds which will make it difficult to get legible results.
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Old Aug 4, 2010, 7:46 PM   #10
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A photograph of something that is flat is not going to be sharp in the corners, especially if the subject is close. (And, btw, the Canon S90 only has a maximum aperture of f/2.0 at it's widest angle of view, so while the exposure may be good, the corner softness will be significant.)

No camera will do this nearly as well as a small, light, inexpensive USB powered flatbed scanner connected to a laptop computer.
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