I've seen some DCS Pro Back from Kodak, for Medium Format Camera for about $10000 USD. Is there a way to build it yourself for cheaper ?
well if you could get the ccd, but seeing that kind of chip is better then hdtv, i would say it would not be worth it. It is the same as trying to build a car from scratch with factory parts--you'll spend much more then to buy the same car.
In that thing you pay for the CCD you get and all the defective ones from maufacturing, the bigger the CCD the more defective ones. So therefore since this one is one of the biggest on the market it is therefore very expensive and since the CCD is the most expensive component it would most likely not be cost effective to build your self. What you could most likely build for fairly cheap from a flatbed scanner is a scanning MF digital back. And that would have great resolution than a CCD back although it would have a much more limited use. No moving objects in the photo.
-Lyle Gordon
-Lyle Gordon
Hmmm... good question.
The largest cost, by a huge measure, is going to be the cost of the CCD, and it will not be cheap. If you are willing to live with a higher defect rate on the CCD, maybe. It has been my experience that large CCDs are not cheap in very low volumes. The actual electrical circuit for controlling a CCD is pretty simple. A CPLD for timing, some simple driving circuits, etc. Even easier if it is CMOS as the voltages are nicer. Analog to Digital is practically a one chip solution now. You need real careful layout and good power supply/decoupling design to achieve a high signal to noise. For CCD chips, can take a bit of playing around with the drive voltage levels to achieve the best dynamic range, good charge transfer, etc.
The big issue is that CCD and CMOS sensors are pretty easy to blow up...... just short one pin when probing with the scope and you are toast...... and there goes a weeks pay.
If you really want to do this, we can talk more, it is something I spent a lot of time doing in a past life.....
The largest cost, by a huge measure, is going to be the cost of the CCD, and it will not be cheap. If you are willing to live with a higher defect rate on the CCD, maybe. It has been my experience that large CCDs are not cheap in very low volumes. The actual electrical circuit for controlling a CCD is pretty simple. A CPLD for timing, some simple driving circuits, etc. Even easier if it is CMOS as the voltages are nicer. Analog to Digital is practically a one chip solution now. You need real careful layout and good power supply/decoupling design to achieve a high signal to noise. For CCD chips, can take a bit of playing around with the drive voltage levels to achieve the best dynamic range, good charge transfer, etc.
The big issue is that CCD and CMOS sensors are pretty easy to blow up...... just short one pin when probing with the scope and you are toast...... and there goes a weeks pay.
If you really want to do this, we can talk more, it is something I spent a lot of time doing in a past life.....
Using Scanner
Sorce,
You say using scanner will yield higher resolution ? What's the highest resolution these days ? I think the Pro Back can do 16 MP. How dense can a scanner do ?
can we build some sort of optic system in front of an enclosed area of the scanner glass, and hit the button to capture ? hehehe, sounds funny, but it would be cool to try.
Sorce,
You say using scanner will yield higher resolution ? What's the highest resolution these days ? I think the Pro Back can do 16 MP. How dense can a scanner do ?
can we build some sort of optic system in front of an enclosed area of the scanner glass, and hit the button to capture ? hehehe, sounds funny, but it would be cool to try.
Alvius
You are en EE aren't you ? Chip designer, I can smell one. Hehehe.
Please talk more, I listen.
Which Altera or Xilinx CLPD would you use for this ? I heard CMOS is slower, but cheaper and dense. Can you talk a little bit more in details ?
You are en EE aren't you ? Chip designer, I can smell one. Hehehe.
Please talk more, I listen.
Which Altera or Xilinx CLPD would you use for this ? I heard CMOS is slower, but cheaper and dense. Can you talk a little bit more in details ?
http://www.imagingspectrum.com/cgi-local/SoftCart.exe/scanningdigitalbacks.html?E+scstore
http://www.rit.edu/~andpph/text-better-scanner-cam.html
http://www.sentex.net/~mwandel/tech/scanner.html
search google for scanning digital camera back...
http://www.rit.edu/~andpph/text-better-scanner-cam.html
http://www.sentex.net/~mwandel/tech/scanner.html
search google for scanning digital camera back...
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