Yodica Sirio 400

Sirio is the Yodica variant that draws green across the top of the frame and runs the bottom toward deep blue and purple. The base is Kodak Gold or ColorPlus 200, pre-exposed by Marco Barbereschi and Cinzia Cancedda in Milan and respooled in Italy. They have been doing this since 2018. The method is consistent across the catalog, but the color recipe shifts roll to roll. Sirio is the one to pick when you want foliage that looks somewhere between fake and otherworldly.

Level a camera at a landscape with sky above and trees below and the gradient does what you expect: greens stack on greens, the upper half goes lurid, the foreground turns navy. The effect is loudest in landscape orientation. In portrait it crosses your subject diagonally, which can work for a face-as-environment shot and almost never works for a straight portrait. Decide before you raise the camera.

Underexposure intensifies the cast. At box speed of ISO 400 you keep recognizable skin tones and the gradient sits politely behind the photograph. At 800 the gradient takes over. Some shooters split the difference at 500. The Gold base wants more light than its 400 rating, so the practical rule is expose for the shadows and accept what the gradient does to the highlights.

Standard C-41, no special chemistry. The lab's auto-correction will try to neutralize the green, so ask for a flat scan if you want the effect to survive. Compared with Antares the look is more environmental than sky-based, and compared with Polaris it is loud rather than subtle. Lomochrome Metropolis suppresses saturation; Sirio adds it in specific channels instead.

Available in 35mm 36 exposure only. No 120, no bulk, no sheet, no DX coding.

Reciprocity exponent is 1.20. Zone Light Meter applies the correction past one second. A metered five-second exposure works out to roughly seven and a half seconds; a 30-second reading lands around 60. The dye in the pre-exposure layer behaves oddly past a minute, where the green channel drifts further than the math predicts.