[Karls48 (Karl)]

Hi All
I would like to combine composite video signal from two identical CCD cameras (but one colour on and the other BW) into one. Commercial mixers are out of the question as they are too big and too expensive. I have searched WEB but could not find the circuit diagram than would do it. I hope that there is expert on video signals processing who could point me in right direction. I’m think about building binocular refractor telescope from two 102mm F5 OTAs. Am I correct assuming that such a telescope would have effective aperture 144mm F3.4? This telescope would be set up only for imagining, not for visual observations. Of course I want first to see how the cameras would work together. Any comments and suggestions welcome.