
Posted: Thu Jan 14, 2010 7:45 am
The best manual system for 4x5 sheet film developing using links to B&H:
Jobi roller base
http://www.bhphotovideo.com/c/product/25524-REG/Jobo_J1509_Roller_Base_for_Combo.html
Jobo 2521 tank
http://www.bhphotovideo.com/c/product/25558-REG/Jobo_J2521_2_Reel_Tank_with_Magnet.html
Jobo 2509n reel
http://www.bhphotovideo.com/c/product/25534-REG/Jobo_J2509N_4x5_Sheet_Film_Reel.html
The 2521 tank can be used for inversion processing but requires 1500ml of chemical and that gets heavy. The tank does not leak like a lot of other tanks.
An alternative: Combi-Plan
http://www.bhphotovideo.com/c/product/23845-REG/HP_Combi_Plan_459809_HP_Combi_4_x.html .
The one I had was slow to fill and drain and always leaked. Others have stated the same problem with theirs. The film holder was not rigid and film would come out of the slots with normal to aggressive agitation. Works well as a dip and dunk tank but would require 3 for dip and dunk processing in a totally dark darkroom.
The Yankee daylight tank
http://www.bhphotovideo.com/c/product/63620-REG/Yankee_YACF45_Cut_Film_Daylight_Developing.html .
Newer design than I am familiar with. Older style allowed chemicals to slosh out easily and was difficult to get even development due to chemical flow and side to side agitation requirement. This one might be OK starting out if you want to keep expenses down but don't expect too much from it. (read the reviews)
Tray development: You will need 4 or 5 trays, 5x7 the smallest size to process 4x5 sheet film.
http://www.bhphotovideo.com/c/product/362624-REG/Yankee_YAB57_Ribbed_Plastic_Developing_Tray.html
You will need a tray for each chemical and a prewash; prewash plain water, filtered or distiled; developer; stop bath, can be water like the prewash; fixer; rinse or wash tray. All chemicals are mixed and brought to developing temperature and kept there for the duration of the processing session. All steps from opening the film holders to removing the film from the fixer must be carried out in total darkness.
Tank processing: Load exposed film onto the tanks reel or holder in total darkness, close the tank and work in daylight. Prewash brings tank and film to the developing temperature and gets the film wet so that it absorbs the chemicals easier. Prewash is optional and Ilford says not to prewash with their films but it does not hurt them. Fill with developer, agitate initially and every 30 seconds to 1 minute there after, pour out the developer at the end of the required time them immediately pour in the stop bath or water rinse, pour out the stop or rinse then pour in the fixer and agitate every minute for the duration of the fix time, pour out the fixer and wash for 5 to 10 minutes with running water the same temperature as the developing chemicals. The best results are achieved when all chemicals and washes are kept within 1 degree of each other.
At the end of the final wash with either tank or tray processing treat the film with wetting agent then hang the film in a dust free place and allow to dry.
Handle film by the edges only!
Exact procedure can be described when you decide on type and chemicals you wish to use.
Agitation: Inversion processing in a sealed tank- Turn the tank upside down, pause for 1/4 to 1/2 a second then return to up right. Repeat 1 to 3 times per cycle.
Yankee tank- gently rock the tank side to side per tank instructions.
Tray processing- one sheet at a time gently lift the tray by a corner and return to level 2 to 3 times per agitation cycle; multiple sheets- pull sheet from the bottom of the stack and place on top, when all sheets have been cycled repeat for duration of developing time. Turning sheets 180 degrees each time they are brought to the top of the stack helps identify when the stack has been completely cycled. Care must be taken not to scratch the film.
Processing with the Jobo tank and roller base: Load the film into the tank, prewash, pour in the minimun amount of developer necessary to develop the amount of film in the tank or minimun amount of chemical specified for the format on the side of the tank whichever is greater, lay the tank on its side on the roller base and continually rotate changing direction of rotation every 30 seconds to 1 minute being consistent until the developing time or fix time has been reached.
Each developer on the market has a minimun amount of developer necessary to fully develope 80 square inches of film. The amount is in the manifacturers spec sheet for that developer.
80 square inches=1 sheet of 8x10 film; 4 4x5 sheets of film; 1 roll of 120 roll film; 1 35mm 36 exposure roll of film.