Compard R09 One Shot is a classic one-shot black-and-white developer based on the original Rodinal recipe. R09 One Shot is a focus-boosting film developer with high speed yield and great acutance. Varying the dilution of the concentrate can affect the subject contrast. 1 + 25 or 1 + 50 dilution (drum processing). Yield: 48 roll films or 35 mm films (500 ml).