Flat ports are recommended for standard, macro and telephoto lenses.  Due to refraction, flat ports reduce the angle of coverage of a lens and magnify the image.  This makes the flat port ideal when using standard, macro or zoom lenses to shoot small subjects.

Our focus ports feature built-in gearing for lenses whose focus collar extends beyond the housing focus.  Note that if a port is long enough to accommodate the full length of a 1:1 macro lens, the lens may vignette when used at infinity.  If access to the lens' full range is desired, then select a dome port instead.

Accommodates lenses up to 5.5-inch (14.0 cm) long and 3.3-inch (8.4 cm) in diameter.