We use these criteria when selecting cameras:
1. SDM/CHDK capability (for our USB triggers).
2. Resolution higher than 8mpix (mostly important for larger texts. If
your book is small, 7 is acceptable. When pages approach A4 you need
3. Some manual control available via the stock firmware or CHDK.
Power supplies are available on eBay for almost every Powershot model
for around $12. I still use batteries, but my next scanner will use
these cheap power supplies.
AFAIK CHDK and SDM do not work with the A480, so it doesn't work for
the cheap USB triggers that emit a 5V pulse. Canon has also been
phasing out software control for these cameras. You will want to check
with Canon or the Gphoto2 people about whether or not it is supported,
or trigger them mechanically (but again, you might not have enough
manual control to do a good job).
The G series canons are good but expensive.
The A590 is still a favorite, often available refurbished for $120.
Watch for Canon Outlet specials or put in a Google Alert for
"refurbished A590 IS".
AFAIK there is no alternative to CHDK other than mechanical
triggering, which is possible. One of our forum members is working on
a system using bicycle brake levers. The 790 IS look like good cameras
to me. If you want more discussion on the matter, I recommend getting
an account at DIYbookscanner.org/forum or at least searching the forum
there. I prefer to keep this kind of communication in the open so
everyone can benefit. You can also see many users there using
non-canon cameras, DSLRs, etc. Many people have asked this question in
the forums and there has been a lot of discussion around it.
daniel_reetz wrote:And though it is slower, you can always start with just one camera.
or trigger them mechanically
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