I have been doing some film tests over the last week and I am getting confused with the results. I am trying to get Zlll by measuring a subject and underexposing by 2 stops. The thing is if the subject is in sunlight it records with more density on the neg than if it is in shade. Surely the brightness of the scene or the amount of light falling on it should make no difference nor should the time of day i.e. middle of the day or evening light? The spot meter is callibrated, film, developer, dev times, camera, lens and temp are all the same and shutter speeds are not long enough for reciprocity failure to come in to it. I always assumed that a subject could be recorded as any zone from 0 to X if exposure was set at 5 stops under ---- 5 stops over the meter reading regardless or light falling on it. Am I wrong? I meter with a Sekonic L-508 1 degree spot meter.