from camera stores. Wide angle lenses will focus at 12" and do not require the addition of any close-up lens when used in a dome port. Other ports available #5503.... Lens length less than 3" (7.6cm) 5503.50 Lens length less than 4" (10.1cm) #5503.55 Lens length less than 4.5" (11.4cm) #5503.80 Lens length less than 5" (12.7cm) #5503.85 Lens length less than 6" (15.2cm) SUPER-WIDE DOME PORT For lenses with a 110 to 170 degrees angle of coverage. This port does not allow use of a port shade, and may not be fully functional with some lenses in the MD-size housing. #5503.15 Lens length less than 2.5" (6.3cm FLAT PORTS For standard, macro and telephoto lenses. #5501..... Lens length less than 2.5" (6.3cm) #5502.......  (less)