T.O. 33B-1-1 6-24 NOTE These  classifications  are  for  the  film  system,  that  is,  the  film  plus  the  associated film-processing    requirements    according     to     the     criteria     established     by     the manufacturers  of  the  film  and  processing  chemicals.The  classifications  previously listed    in    T.O    33B-1-1    approximately    corresponds    to    the    new    film    system classifications as follows: a.    Class 1 ð ASTM Class Special b.    Class 2 ð ASTM Class I c.    Class 3 ð ASTM Class II d.    Class 4 ð ASTM Class III e.        Exceptions  include  films  followed  by  an  arrow  (á);  they  are  the  equivalent  of one  class  higher  in  the  new  system  classification  compared  to  the  previous  T.O. 33B-1-1 classification. Table 6-3.  Film Classes. System Class Manufacturer Special I II III Agfa D2 D3 D4 D5(á) D7 (á) D8 Fuji IX25 IX 20 IX 50 IX 80 IX 100 IX 150 Kodak DR M MX 125 T (á) AA400 (á) CX The following table includes the ISO speed and signal-to-noise ratio for each film type. Table 6-4.  Speed and Signal to Noise Ratio. Class Special I II III Man- ufacturer Type Speed S/N Type Speed S/N Type Speed S/N Type Speed S/N Agfa D2             40         371 D3              64          294 D4             100         232 D5(á)        200         169 D7 (á)    320        142 D8         400      114 Fuji IX25           50 IX 20            25 IX 50           100 IX 80           200 IX 100      320 IX 150     500 Kodak DR            32          378 M                   80         320 MX 125        125        220 T (á)            200        209 AA400 (á)  320     140 CX         400    124