I have an Ilford HP5+ tech pamphlet with a temperature conversion chart. The chart is supposed to be accurate with any developer you choose. Unfortunately the chart is in degrees F and I don't know what 24 degrees C in equal to in degrees F. (Dumb American.)
Assuming you have exposed your films at EI 400 your normal time/temp is indeed correct at 6 1/2 mins at 20 degrees C (which is 68 degrees F.) developed with Kodak T-Max 1-4.
Hopefully the data you need is below:
70 degrees F=== 6 min.
72 degrees F=== 5 1/2 min.
74 degrees F=== 5 min.
75 degrees F=== 4 1/2 min
Developing for a shorter time than 5 mins is not recommended as it may give you uneven development.
A better solution would be to bring down the temps of your developer, stop bath and fixer to 20 degrees C by using a tray of cold water (ice cubes) before you process and then using a another tray as a 20 degree C water bath for your tank while you develop. Your wash water temp can be a little higher but lower than 80 degrees F.
Walter
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On Wednesday, April 21, 2004, at 02:18 AM, trevor cunningham wrote:
Hey gang, I shot a couple of rolls of HP5+ in England and am about to develop them. Only, I have Kodak Tmax developer. All the charts I've seen say 6.5 minutes at 20 degrees, but my temps are a bit warmer. Does anybody know the development time at 24 degrees? Or, does anybody know the decrease for each degree of added warmth?<image.tiff>
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