Good question, as an aero recon film have no idea how it would work with a fine grain developer like Perceptol, when in the US Air Force in the 70s we always used an accuance type developer for recon film to maximize fine detail. I shot one roll of Rollie 200, I had used ISO 200, but should have shot at 100 for better shadow details, if as noted by Anon Ymous you will lose a stop with Perceptol (Kodak Microdal X), I would shot at 50 and develop for 10 mint stock. Hopefully someone will have real world experience.