Does anyone know? 1. What is the difference in the contrast range between Ilford 125, shot at 125, and Ilford 400, shot at 200 or 300. Or, can I pick up a coupl e of f stops and still not lose my grey tones? 2. What is the best developer to get the longest grey scale out of the above film. 3. Is there any difference bet ween Ilford and Agfa with regards to the above. Thanks much.