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The 18-35mm T2 Super Speed Zoom Lens from GL Optics is a re-housed Sigma 18-35mm f/1.8 lens that has been modified for cinema use and covers formats up to APS-C and Super 35. The original lens mount and housing and been removed and replaced with a stainless steel PL mount and a 6063 aluminum lens body, which features a 95mm front diameter and mod 0.8 gears for focus, zoom, and aperture control.
More than just a re-housing, the lens has been collimated and made parfocal, so focus won't shift as your zoom through the focal range. The focus throw has been also increased to 120°, with a 300° rotating version of the lens also available. The aperture control ring has been de-clicked aperture for smooth iris pulls, with focus and aperture markings placed on the sides of the lens for easy viewing by focus pullers and camera assistants. Aperture marks are listed in f-stops, with the maximum aperture of f/1.8 having a T-stop (effective transmission) of 2.0.