I have just re-read the excellent article by Sandy King on Pyro developers in [color=blue][/color]www.unblinkingeye.com. I have just one question about the developing time graphs for silver gelatin prints. Sandy stated that the test films for producing these charts were rotary processed using BTZS tubes. Whilst I have no idea how these tubes work I understand that rotary processing usually means shorter development times. As I intend to develop both roll and sheet films in daylight tanks do I have to increase the indicated times to take account of this method?