Archived posting to the Leica Users Group, 2002/02/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]For those who are interested the following is a not a very good translation of the amaloco instructions supplied with this developer. It may shed some light on it's equivalent developer from another manufacturer. My experience with this developer is that when everything is perfect (exposure, temperature, development time, position of stars and planets etc) then it really is a remarkable developer. Slight deviations from perfection and this developer is just like any other. AM50 Gammanool General AM50 is a 1 shot fine grain developer, that is specially made to develop films that have been exposed at their rated speed. AM 50 is a surface developer based on pyrocatechol / sodium hydroxide. By the high pH value it is however no genuine balance developer.?????? Films, which are to be developed in AM50 must be correctly exposed, under or over exposed film results in quality losses. In the case of the correct exposure, negatives of undreamt-of quality with very fine grain, high outline sharpness and extremely fine detail result. This applies both to films of low as well as with high sensitivity. Basically all exposure indices can be developed in AM50. (read all films) Packing AM50 is available in small refillable bottles with screw-type cap. The size of the bottle enables a simple refill from the refilling packing. By this method one always has fresh developer to work with, which for constant high quality, is a prerequisite. Additionally it offers max. Security to you. Small packing 3 x 20 ml, refilling 60ml. Savings through the use of the 20 ml. bottles: If all contents of a bottle are not used, then the remainder in the same bottle can be kept and be filled up to the filling mark with water. The additional dilution should be noted on the bottle. Usage Mix only briefly before use with simple tap water to dilute. After good agitating the solution is ready for use. Dilution Normal 1 + 29/1:30. Example: for a certain developing tank, 250 ml. liquid is necessary. Begin with 232 ml water and add 8 ml. AM50 Thoroughly agitate briefly, and bring up to working temperature. The developer is ready for the immediate use. Use only 1:30 as working solution. Minimum concentrate of AM50 per 35 mm film is 8ml. After use the solution no longer operates reliably and must be discarded. Working temperature Optimum results are obtained with a temperature of exactly 20°C. Deviations of more than 0,5°C are to be avoided. We therefore expressly indicate only development times for 20°C. Agitation For 35mm films agitate constantly for the first 30 seconds then at 30 second intervals 2x inversion of the developing tank. For roll films agitate constantly for the first 30 seconds then at 15 second intervals 1x inversion of the developing tank. This agitation insures even development with no, so named, bromide effect. Exposure Expose the film as recommended by the manufacturer. This does not apply however to Ilford Delta 3200 and Kodak tmax 3200 film. See table. Development table The development times are exclusive of filling/emptying times, are expressed in minutes and based on a developer temperature of 20°C. The exposure index and development times are based upon an average negative contrast. The development times are for 35 mm and roll films and are based upon our recent experience with the film emulsions. If your method of working is to over expose by 1 stop then we suggest you reduce the development times by 20-30%. This does not apply to Ilford 3200 and Kodak tmax 3200 films. Film type ISO Exposed at Development time Agfapan APX 25 25/15° 25/15° 7'30" Agfapan APX 100 100/21° 100/21° 10'00" Agfapan APX 400 400/27° 400/27° 8'30" Fuji Neopan 100 100/21° 125/22° 7'30" Fuji Neopan Prof 400/27° 400/27° 8'30" Ilford Pan F Plus 50/18° 50/18° 3'45" Ilford Delta 100 Pro100/21° 100/21° 6'30" Ilford FP 4 Plus 125/22° 125/22° 5'00" Ilford HP 5 Plus 400/27° 400/27° 7'30" Ilford Delta 400 Prof 400/27° 400/27° 10'30" Ilford Delta 3200 3200/36° 1600/33° 10'00" Kodak Plus X Pro 125/22° 125/22° 4'30" Kodak Td X 400/27° 400/27° 8'30" Kodak T-Max 100 100/21° 100/21° 8'00" Kodak T-Max 400 400/27° 400/27° 9'00" Kodak T-Max 3200 3200/36° 1600/33° 10'0" Kodak T-Max 3200 3200/36° 3200/36° 15'00" Tura P 150 100/21° 100/21° 10'00" Tura P 400 400/27° 400/27° 8'30" Hope this is of interest John B - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html