I watched that programme last night and wasted another hour of my life. Noting but a load of dimwits saying 'believe me, it was all faked' and 'ooh, it was ever so difficult, far too difficult for me to understand'.
The crosshairs appear to 'disappear' when they are swamped by saturated white surfaces. It's nothing other than overexposure off the photographic emulsion in those areas.
Ok then Pap. We've spent long enough on this, let's take the conspiracist points one at a time and we'll try to convince you. Please pick one to start.