No chart is perfect, of course, but this one will provide a good point of reference and will allow one to get close a lot closer than anything else I've seen. If you've got something that shows the differences between types of developing agents, I'd love to see it, and would be happy to add the information to this page.
BTW, just to put all this, and any discussion about developers and technique, lens quality, and equipment, etc., into perspective, there are enough variations out there to make anything posted here little more than a reference point. Everyone should test their own equipment and technique. For example, Ilford calls for a certain developing time for their films with ID-11. Using my technique, equipment (timer, thermometer, cameras, light meter, beakers and graduates), water quality, and whatever all else can be added to the equation, my times are about 25% - 30% shorter. Some people say (it was noted in The Film Developing Cookbook) that, since D76 and ID-11 are essentially the same formula, developing times using these developers should be identical. However, Ilford publishes figures showing different times for these developers, and my times work out best with ID-11 about 10% less than with D-76, which ends up being different from Ilford times in many instances. Frantisek Vlcek wrote: > BTW, The only problem with such variation is that different developers > react differently to change in temperature. The basic agents like HQ, > ... have different temp. characteristics. I have got in my old books a > chart with the exponent for different developing agents, I'll try to > find it. So for most precise work, I think developing at one > temperature always using tempered water and water bath is the best way > to go. Saying that, it's just too much hassle for me and I use the > Ilford chart frequently ;-) -- Shel Belinkoff mailto:[EMAIL PROTECTED] http://home.earthlink.net/~belinkoff/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
