yaya
Active member
You're mixing a few different things here...It has little to do with CCD vs CMOS. You get faster refresh rates with 35mm
DSLR cameras because they use line skipping techniques in order to get the data out and processed quickly. Also the processors are much faster.
Just look at how the D800 can process 1080 video. Scale it in real time for the on camera screen and out put uncompressed HDMI. That is massive data throughput . MF digital backs don't come close to these speeds.
Digital backs use full-frame CCD technology, as opposed to Interline CCD technology, which is the one used in P&S and video cameras
The Dalsa 33MP sensor, for example, can provide a maximum of 4fps (RAW 16-bit stills) if all 4 outputs are used. Trouble is that the noise/signal ratio will go up and also there are no MF bodies that can take 4fps*
In Live View, Leaf backs do 5-6fps at 100% zoom as we utilise sub-sampling (something like binning)
CMOS, in a way, is closer to Interline CCDs. There's a Kodak 29MP Interline sensor that is used for industrial and aerial applications, however is is only 24x36mm....
So right now, if you want/ need to go either larger than 24x36 or more than 36MP, your answer is a digital back, proof.
BR
Yair
* The AFi/Hy6 camera can do 4fps in mirror-up mode. I can show you a video that demonstrates it