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Photo Forum / Film Photography / Darkroom / January 2005Processing one roll
I have a two-roll 35mm tank, but I only want to process one roll. Do I need to waste an extra 8 oz. to top it up? Will I have a problem with bubbles if the tank is half empty? No, I routinely use 333ml in my tank for one roll with out any problem. So for a 1 liter kit I mix 3 batches. Do a check that the actual amount will cover the bottom reel. Cheers > I have a two-roll 35mm tank, but I only want to process one roll. Do I need > to waste an extra 8 oz. to top it up? Will I have a problem with bubbles if > the tank is half empty? I wondered if d-76 tended to foam? > No, I routinely use 333ml in my tank for one roll with out any problem. So for a 1 liter kit I mix 3 batches. > [quoted text clipped - 5 lines] > > to waste an extra 8 oz. to top it up? Will I have a problem with bubbles if > > the tank is half empty? Toss it around and see? Really, some things you just have to try to see if your assumptions are correct. ( without the film of course ) Cheers > I wondered if d-76 tended to foam? > [quoted text clipped - 12 lines] > if > > > the tank is half empty? > I wondered if d-76 tended to foam? If you forget to wash your tank or reel or the tank cover well you may leave photo-flo residue on and the next time you use the tank you may get foam. It takes very little to do this. Bert But anyway, do you think the foam would be any problem to developper?s chemistry? > > I wondered if d-76 tended to foam? > [quoted text clipped - 3 lines] > > Bert > I have a two-roll 35mm tank, but I only want to process one roll. Do I need > to waste an extra 8 oz. to top it up? Will I have a problem with bubbles if > the tank is half empty? Hi Hugh, The options are (1) wait until you have two rolls; (2) get a single roll tank (eventually it is a good idea to have a full set of them for 1, 2, and 4 rolls - I even have one for 8 rolls); (3) dilute the developer, fill the tank and add a second empty reel so that the reel with the film does not move around. The reason for the second reel is that you do not want an unknown amount of agitation (or too aggressive agitation) occurring when the reel slides up and down in the tank. As to the dilution of the developer, that will require some adjustment in developing time. There have been some discussions in the past couple of years in this newsgroup about developer dilution and time that you may wish to look up in Google. But beware that beyond a certain point of dilution there is the likelihood that grain structure will be adversely affected, as too little developer will be in the solution. Francis A. Miniter Should I dilute more than the usual 1:2 for d-76? > > I have a two-roll 35mm tank, but I only want to process one roll. Do I need > > to waste an extra 8 oz. to top it up? Will I have a problem with bubbles if [quoted text clipped - 19 lines] > > Francis A. Miniter > Should I dilute more than the usual 1:2 for d-76? You can dilute D-76 to 1:3, but I think that 1:2 is adequate in the circumstances for economy and quality. I generally dilute my stock solution to 1:1, but have gone to 1:2 in the past. Do you usually mix one part of stock D-76 to 2 parts water? Francis A. Miniter >>>I have a two-roll 35mm tank, but I only want to process one roll. Do I > [quoted text clipped - 49 lines] >> >>Francis A. Miniter Sorry. I mis-typed. I normally dilute 1:1. What affect does going to 1:3 dilution have on the negative. Just slows everything down? ie 30 mins. instead of 10 minutes in the tank? > > Should I dilute more than the usual 1:2 for d-76? > [quoted text clipped - 58 lines] > >> > >>Francis A. Miniter You should not dilute D-76 beyond 1:1. D-76 contains only 2 g/l of metol. Diluting it to 1:3 reduces the metol to 0.5 g/l, risking uneven development due to exhaustion. Microdol-X (similar to D-23) contains a lot more metol (probably 3-4 times as much), so going to 1+3 dilution is not a concern. There would probably be a very small increase in grain. To calculate a starting point for estimation of the development time for an increased dilution, use the square root of the relative dilution components times the known time for the starting dilution. In other words, if you are using D-76 at 1:1 and have found the for the particular film, 10 minutes is good at that dilution, THEN: Dilution A = 1:1 which has 2 dilution components. The SQRT of 2 = 1.414 Time(A) = 10 minutes Dilution B @ 1:3 will have 4 dilution components. The SQRT of 4 = 2 So Time(B) = Time(A) x 2/1.414 = 10 X 1.414 = 14.14 minutes. If Dilution B were 1:2 then Dilution B would have 3 dilution components and SQRT of 3 = 1.732. Going from Dilution A to Dilution B would slove as follows: Time(B) = 10 x 1.732/1.414 = 12.25 minutes. Remember, though that these times are just starting points. While this formula may work well for some developers (I find it useful for D-76 and for DK-50) the concentration of developing agents in different developers may require some variance from this computation. Francis A. Miniter > Sorry. I mis-typed. I normally dilute 1:1. What affect does going to 1:3 > dilution have on the negative. Just slows everything down? ie 30 mins. [quoted text clipped - 80 lines] >>>> >>>>Francis A. Miniter Two possibilities: 1. Add an empty spindle above the used one to hold the full spindle in place, process with chemcistry for one. I have never experienced any problems with this 2. Add an extra spindle above the full one and process with chemistry for two. All you will "waste" is the developer on a one shot basis, so it's not a big deal anyway. >I have a two-roll 35mm tank, but I only want to process one roll. Do I need > to waste an extra 8 oz. to top it up? Will I have a problem with bubbles > if > the tank is half empty? Yes, absolutely. Place an empty reel in there too, to kepp the other reel from sloshing around. This is not an option. > I have a two-roll 35mm tank, but I only want to process one roll. Do I need > to waste an extra 8 oz. to top it up? Will I have a problem with bubbles if > the tank is half empty? Some may say that the tank has to be full to control the turbulence in the tank that may result from all the empty space. This increased turbulence could cause uneven or increased developer activity. You could have more air bubbles; with each agitation cycle, sharply rap the tank against the counter to dislodge the bubbles. If it were me, I would use the amount of chemical to cover the one reel (8 ounces?), but put a second empty reel on top so that the full reel doesn't move around so much, possibly causing the tail of the film to unspool. For best results, always use the proper size tank, but unless the roll is critical, (perhaps exposure tests) or the developer time is short, (less than 5 minutes) or you're developing slide film (less exposure latitude), don't sweat it. Ken Hart I have been processing single roll in a three roll plastic tank for the past three, without any problems. I use chemistry needed for ONE roll only. It comes to about 400 ml. I usually use equivalent of D76 1+1 as one shot. > I have a two-roll 35mm tank, but I only want to process one roll. Do I need > to waste an extra 8 oz. to top it up? Will I have a problem with bubbles if > the tank is half empty? |
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