Camerapedia on the Mamiya/Sekor TL series Pentax Forums on the Vivitar 135mm F2.8 Auto Telephoto Club Snap on the Vivitar 28mm 1:2.5 Auto Wide-Angle
Camerapedia on the Mamiya/Sekor TL series Pentax Forums on the Vivitar 135mm F2.8 Auto Telephoto Club Snap on the Vivitar 28mm 1:2.5 Auto Wide-Angle