Varifocal lenses permit changing of the effective focal length (EFL).
Camera installations in a variety of places often require flexibility of focal lengths in lenses.
Simple dial on varifocal lenses enables easy focal length adjustments thus easy installations in different applications and places.
Samyang offers two different categories of Varifocal CCTV lenses, one in CS mount and the other in board type.

CS Mount  
Focal Length DC Auto Iris Manual Iris Aspherical IR lens
f=3.5~8.0mm SCV358DC SCV358MI SCV35810ASIR
    SCV358DIR
f=2.9~8.2mm SCV2982DC  
f=3.0~8.0mm     SCV308DIR
f=2.8~10.0mm SCV2810DC SCV2810MI  
f=2.8~12.0mm     SCV2812ASIR
f=4.0~16.0mm SCV416DC SCV416MI  
f=4.2~15.5mm     SCV42155DIR
f=5.0~50.0mm SCV550DC SCV550MI SCV550AS
SCV55014DC   SCV550DIR
Board Mount  
Focal Length DC Auto Iris Fixed Iris Day&Night Lens
f=2.6~6.0mm SCVD266B SCVD266BF SCVD266BDN
SCVD266S SCVD266SF SCVD266SDN
f=2.8~10.0mm SCVD281012ASIR   SCVD281012ASDN
f=3.0~12.0mm SCVD3012ASIR   SCVD3012ASDN
f=3.3~12.0mm SCVD3312ASIR SCVD3312FASIR SCVD3312ASDN
f=3.8~9.5mm SCVD3895ASIR SCVD3895FASIR SCVD3895ASDN
f=4.0~9.0mm SCVD490B SCVD490BF SCVD490BDN
SCVD490S SCVD490SF SCVD490SDN
SCVD49012ASIR   SCVD49012ASDN
f=9.0~22.0mm SCVD92214ASIR   SCVD92214ASDN