Have to tip to the hat to Rent Cinema Glass for their lens tests videos. There are 12 lens test videos all up with 11 here in this post featuring Leica R, Zeiss Superspeed, Canon FD, Sigma, and Tokina glass. The G L Optics Sigma 50-100mm T2 lens test is HERE.
Special note to the dynamic duo Vitaliy Kiselev, and Mike Linn. Find your own stories, or credit the source.
RENT CINEMA GLASS Bonus Lens Test Videos