Fujifilm T64

T64 was Fuji's professional tungsten-balanced E-6 slide film, sold under the RTP code for studio and copy work under 3200K illumination without filtration. The T was literal: tungsten. At its native ISO 64, the film returned neutral whites under hot lights where daylight stocks like Provia 100F or Sensia 100 would have gone orange and required an 80B filter that cost two stops of light.

The target audience was specific. Commercial studios shooting product, fashion catalog under quartz fixtures, museum copy work, and motion-picture-adjacent stills photography all used tungsten-balanced E-6 because correction filters added cost and grain. Against Kodak Ektachrome 64T, the closest competitor, T64 ran cooler in the shadows and held cleaner greens. Most studios stocked one or the other based on which lab was closer.

Grain and resolution were respectable. Diffuse RMS granularity ran around 7 thanks to Fuji's Multi-Structured Sigma Crystal emulsion, with resolving power near 135 lines per millimeter. T64 resolved finer than Ektachrome 64T by a small margin and held tighter highlight transitions in copy work where smooth gradient backgrounds had to scan without banding.

Using T64 outdoors required an 85B daylight conversion filter, which dropped effective speed to ISO 16 in sunlight. That math kept it firmly in studio territory; nobody loaded T64 for landscape work intentionally. Sold in 35mm, 120, and 4x5 sheet, usable on view cameras for tabletop and technical work.

Fuji discontinued T64 in 2010 in the broader E-6 contraction that took Sensia and Provia 400X with it. CineStill 800T covers part of the same niche today through Vision3 chemistry, though the look and price are different. There is no direct replacement.

Reciprocity exponent is 1.10. Zone Light Meter applies the correction past one second, so a 30-second meter reading lands at about 35 seconds at the negative. For studio strobe and continuous tungsten work the threshold rarely came up. For longer copy-stand or architectural interior work the correction stays gentle and the film responds predictably.