Fujifilm Sensia 400

Sensia 400 was the fastest stock in Fuji's consumer slide line, sold under the RH code and aimed at photographers who wanted E-6 in light that defeated Sensia 100. The datasheet figures are honest: diffuse RMS granularity of 13, resolving power around 135 lines per millimeter at high chart contrast. That is more grain than Sensia 100, less than you would expect at this speed in E-6, and finer than Ektachrome E200 pushed a stop, which was the closest competitor. The grain shows on 8x10 prints but does not dominate them.

The character is what people forget about consumer slide films. Sensia 400 renders skin tones with a slight warmth, holds greens without the magenta lean of older high-speed reversal stocks, and keeps blues honest under overcast skies. Compared to Provia 400X, which was the professional 400-speed Fujichrome, Sensia 400 is slightly less neutral and slightly noisier. Against print film of the same speed it is dramatically sharper, with the color snap only slide chemistry provides.

Pushing is the soft spot. Sensia 400 takes a stop in development but grain doubles visually and color balance shifts. If you need 800, you push it; if you can plan ahead, you bring Provia 400X. The pushed look is grittier than most slide shooters want.

Fuji ran the line from 1995 through 2010, with second-generation emulsions in the late nineties and a third generation in 2003 that improved grain and reduced color crossover at long exposures. The 400-speed version was sold only in 35mm in its later years; 120 was dropped earlier.

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. The datasheet specifies color-balance compensation starting at one minute or longer, so for typical handheld and short tripod work the math barely registers. Surviving rolls are all heavily expired now. Expect a faint shift toward magenta in shadows.