If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
D-76
wrote:
With 1:1 D76 one shot, what's the max number of rolls, say Ilford Delta 100 (or your favorite BW film), can be fully developed in 1000 ml in a JOBO processor? thanks, alex There's at least 8 rolls of chemistry in 1 liter of stock. 12 rolls I think a more reasonable number and that with very exposed high speed film. 16 rolls wouldn't surprise me using slower normally exposed film. Sky's the limit for slow unexposed film. I'm quite sure Kodak and others with their one-size-fits-all recommendations have allowed a Great deal of margin. Split that 1 liter stock as fits your needs. The more dilute the more time. I think 1:3 perhaps a practicle limit. I advise dilution from stock to working strength at time of use. Keep stock in small bottles. Should last a long time. Dan |
#12
|
|||
|
|||
D-76
Jon Rogers wrote:
I've tried stainless steel tanks and couldn't get on with them, so I now use Paterson, which stipulates 290ml/10oz per 35mm roll, and 200ml/17.5oz per 120 roll. I mix 1 litre of D-76, and store it in four 250ml bottles. When I come to use it, I simply add 250ml of water, and use as much as I need (i.e. 300ml for a 35mm film (discarding 200ml), or the whole 500ml for a roll film. If I want to develop multiple films, I'll use 600ml for two 35mm films, and discard 400ml. I guess from now on, I'll just put the the whole 1l in the tank, effectively using 8.5 oz per film, and this issue won't arise. I haven't used Paterson tanks. But my guess is that you won't be able to get a full 1 liter in a tank that holds only two reels. The amount of solution you use should be determined by what the tank holds. Then, if that amount is less than the (450ml of 1:1)/1 roll capacity, you can extend the developing time. The stock solution keeps OK in a full bottle, and for a little while in a half full bottle, so you don't need to immediately discard the part you don't use when diluting down to 1:1. I keep it in plastic drink bottles that can be squeezed to get the air out (I label and store them so nobody drinks it, of course.) |
#13
|
|||
|
|||
D-76
On 13 Jan 2006 15:44:45 -0800,
" wrote: That makes 4 rolls. And if undiluted D76 (1:0) is used, does it mean it can do 8 rolls in 1000 ml? January 16, 2006, from Lloyd Erlick, Kodak rates the capacity of D76 at 16 rolls of film per gallon. It makes no difference how it is diluted or applied, the gallon will still develop 16 rolls. (For ease of calculating mentally, it is probably acceptable to say 4 liters of D76 will be equivalent to a gallon.) The recommendation of Kodak is very likely a conservative one, so it could be possible to develop more than 16 rolls per gallon. How many more would depend on individual variables such as how much exposure one's rolls have recieved. regards, --le ________________________________ Lloyd Erlick Portraits, Toronto. voice: 416-686-0326 email: net: www.heylloyd.com ________________________________ -- |
#14
|
|||
|
|||
D-76
Richard Knoppow wrote:
There is still a data sheet for D-76 on the Kodak web site. Search for J-78 At 1:1 the capacity is given as one 80 square inch roll in 16 ounces or two in one liter. If a single roll of 36 exposure 35mm film (80 square inches) is developed in an 8 ounce tank or two in a 16 ounce tank extend the recommended development time by 10%. Well what's it going to be, one roll or two in 16 ounces? Or did you mean to say, extend the time if two rolls are in that 16 ounces. I think an additional 30 to 40% increase in time would see that 16 rolls I mentioned well done from 1 liter of stock. 16 rolls of 120 at 400 ml per roll equals 4.8 liters of working strength. That's a 1:4 dilution. Say Plus X, 16 minutes, invert twice each two minutes. I don't use off the shelf D-76 so can not test. An easy enough thing to do though. Why throw good chemistry down the drain. Test it. Dan |
#15
|
|||
|
|||
D-76
An error in that dilution I'm sure a few spotted.
At 375 ml per roll 16 rolls would need a 1:5 dilution. As Mr. Erlick has reasserted, cut it any way you like; so much chemistry = so many rolls. I think the 4 roll per liter stock pre-planned obsolescence. Dan |
|
Thread Tools | |
Display Modes | |
|
|