Yodica Atlas 400

Atlas is the rainbow-burst roll in Yodica's lineup. Instead of a single colored cast like Andromeda's pink or Pegasus's banded gradient, Atlas pre-exposes the entire roll with a multi-colored burst that scatters reds, yellows, blues, and greens across each frame in a way that looks closer to a light leak than a filter. Two frames from the same roll never come back looking the same.

Yodica is a small Milan workshop that started producing these handmade effect films around 2018. Each roll is hand-treated, which is why the look drifts between rolls and even within a single roll. The base is a standard ISO 400 C-41 color negative; the magic happens in the pre-exposure step before the film is canned. What you are buying is the treatment, not the silver.

The rainbow effect lands hardest in mid-tones and shadows. Highlights tend to wash out the colored pre-flash, so a heavily backlit subject will look closer to a normal frame with a few colored streaks at the edges. A subject in even, soft light will look like someone aimed a spectrum at the film while the shutter was open.

Rate it at box speed, 400. The closest peer is Yodica's own Pegasus, which lays the rainbow as a horizontal gradient instead of a scatter. Dubblefilm Bubblegum is in the same territory but only does pink, blue, and purple, with much less variation across the frame.

35mm only, 36 exposures, C-41 at any standard lab. Atlas runs in small batches and disappears from shelves for stretches at a time. If you want every frame to look like the last one, this is the wrong purchase.

The reciprocity exponent is 1.20. Zone Light Meter applies the correction past one second. A metered 8-second exposure becomes about 13 seconds at the negative. For long exposures the pre-flash colors can shift relative to the captured image, which adds another layer of randomness; bracket if you care where the burst lands.