i want to build a 3dscan booth with 64 cameras....
What would be the cons of this setup?
Can i simply take image from all of them at once, even if they are different models with different firmwares?
Some Rig Design Points to Consider:-
# Maximuim Length of USB-2 cable runs, the limit is about 5 meters.
# Location of and the Number of Ports in your USB-2 Hubs.
# Possible Use of "Active" USB-2 Hubs and the use of Sheilded Cat-6 cables.
# Grounding & Sheilding of USB-2 Cables.
# Termination, Grounding & Sheilding of the Common "Shoot" Cable; if used.
# Grounding & Sheilding of the Power Cabling.
A good Multi-Camera wiring practice is to seperate the "Camera-Control" from the "Camera-Power"
circuits this is very important if you plan on mains power for the multi-camera rig. There some simple
"Industry Standard" things you can do to help minimise this problem.
To save costs the vendors, including the "Canon" versions of mains based power supplies have not
installed sufficent filtering. Besides saving on the missing components the reason is very simple, they
assume that only "ONE" camera will be used AND "RELY" on the Canon Camera Power Manamagement IC
to take the place of a "Low Internal Resistance" Battery. To put this more "Simply" the more cameras you
have in your multi-camera rig the "Camera Power" Cable runs will become longer and, as a direct result,
will have a "Higher Internal Resistance".
Just consider a "Single Camera" DON'T just assume that it will draw a fairy constant "Current" from your
"Fake" battery the actual current varies greatly according to many different factors.
So with a combination of, "Poor Wiring", "Multiple-Cameras", and "Long Cable Runs" in your rig
can then very easily become "Un-Reliable". It's then very easy to blame something such as a
USB-Brand for causing your wiring problems.
An Idea that I am working on is to have a slightly more advanced "Fake Battery" adaptors that also
have the required missing components, I also think that there are some other fairly simple and cheap options.
Another simple thing to do is to attempt to measure some of this stuff ... with a old or oblesete PC etc.
H-H
Ref:-
http://chdk.wikia.com/wiki/Multiple_Cameras_using_CHDKEdit Also See attached "Bug Splatter" a560 Camera Battery and Current Measurments
