Technical specification projection system dlp projection method ceiling front rear 3d compatibility dlp 3d video compatibility edtv hdtv ntsc pal sdtv secam computer compatibility mac windows projection lens lens type manual focus manual zoom minimum lens aperture f256 maximum lens aperture f268 minimum focal length 2204 mm maximum focal length 2414 mm minimum diagonal image size 58420 mm maximum diagonal image size 62 m minimum projection distance 1m maximum proj