Also, shelf life. Because it’s ascorbic acid based, once you open the bottle, you have about 6 months. It oxidizes faster than phenidone-based developers. If you shoot one roll a month, stick to Rodinal. If you’re a heavy shooter, F1 is fine.
Osiris F1 produces what I call "structured grain." It’s not the invisible, plastic-y grain of XTOL or DD-X. It’s also not the volcanic, artistic grain of Rodinal. It sits in the middle. Under a loupe, the grain looks tight and sharp, like fine sandpaper rather than jagged rocks. Scans come out looking detailed without requiring heavy sharpening in post.
But every so often, a niche chemist or a small-batch manufacturer releases something that makes you question why we all settled for the standard formulas. is one of those developers.
In the Darkroom with Osiris F1: The Alchemist’s Alternative to D-76
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