I have the smallest of the Jobo tanks that fits 4x5Ē sheet films, a 2500 tank.
I currently rotate it by hand with constant agitation when developing. I've tried floating it in a sink of water to make the rotation easier, but the tank floats too low in the water and water pours into the tank through the filling spout (I donít have a lid/cap for the tank) and dilutes my chemicals
So Iíve been looking at getting the Jobo manual roller base for the tank, to make agitation easier. Does anyone have one of these? Iím concerned that the rollers might be spread too far apart (width-ways) to cope with the smallest of the Jobo tanks like my 2500, which is barely over 4 inches wide. Same story with the used Beseler or Unicolour motorised roller bases that you might be able to find on fleabay Ė are the rollers too far apart for a small tank like mine?
Secondly Ė when using constant agitation in tanks, one reduces the development time by 10 or 15% according to the devís instructions. Iím using Delta 100 in Ilfosol 3 for 5 mins, less 15% = 4 minutes 15 seconds. However my negs still are really contrasty and over developed. Itís possible my dev was a little warm (tap water came out at 25degrees Ė it is Summer here after all!) but I think I need to further reduce time for constant agitation. Does anyone have any pointers??
Thanks in advance