Sorry, it took me a while to answer this one, because I was 'focusing' on other things (with the excuse of the joke).
> Please elaborate how exactly you can utilize the Circle of confusion > to check focus during shooting? > What formula binds the CoC with the sensor format? It is more like a > property of a lens... though I could find a table with sensor formats. The CoC is one of the values to calculate the Hyperfocal distance (http://www.dofmaster.com/equations.html), which in its turn is the basis for calculating the Near and Far distances of "acceptable sharpness". According to Wikipedia (http://en.wikipedia.org/wiki/Circle_of_confusion), the CoC is calculated using the frame diagonal, so it would be directly related to the sensor/film (if this is case, then Elphel's CoC The software I posted the link will do the maths for us in field, because we won't have internet there. I was planning to do a script to do that, but then I decided to check if anyone had already done it. It was a nice surprise. As to how we'll use it, well, we have a simple problem: we will have a camera operator in the setting; its signal will be sent to the director and the director of photography via LAN cable to a central computer; then it is sent back to the camera operator via wi-fi to a smartphone, that will be used as viewfinder. That means the camera won't be able to change nor check the focus without the calculations - he will need to do the focus pulling previously. That's the reason. It may be arguable that by using a tablet instead of a smartphone this problem wouldn't be as critical. A better wifi hardware would provide a better preview (bandwidth and processing power) for the viewfinder. Even so, that probably wouldn't be enough to tense our nerves, which will throw us back to relying on the maths. =) Oleg, I'll check the focus helper, thanks for the link. _______________________________________________ Support-list mailing list [email protected] http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
