This 8mm manual focus, wide-angle fisheye cine lens from Samyang is
designed for digital cameras with an APS-C image sensor. The focus gear
ring allows for a follow focus system and with distance scales marked on
both sides and an uncoupled aperture gear ring the aperture can be
precisely and quietly adjusted to ensure a smooth, jump-free transition
for professional looking video.
The T number (T3.8-T22) represents the actual light transmission and at
T3.8 you are able to capture natural, atmospheric footage under various
lighting conditions. Fisheye lenses are great for special effects use
where distortion and exaggerated perspectives are desired.