EXPOSURE AND DEVELOPING 25 



is more, for Nature Study work they are really 

 not suitable unless they are stopped down to /ii 

 or /16 in order to make the picture as sharp " all 

 over " as possible. For this reason, a cheaper lens 

 is just as suitable, and its only disadvantage is 

 that just mentioned, that it cannot be used for 

 " snapshots " except in the brightest sunlight. 



Therefore if you want a good negative, which 

 will yield a good print, give as slow an exposure as 

 you can. I confess that I aim at over-exposure 

 almost always; because then it is possible to 

 develope with a restrained developer, and bring 

 out the picture quickly, and at the same time to 

 make sure of having a good negative. If the 

 negative is under-exposed, nothing can be done to 

 make a good picture from it. 



For developer I content myself by saying that I 

 invariably use what is called the " Imperial 

 Standard Developer." 



No. I 



Pyrogallic Acid . . 55 gns. .6 grms. 

 Metol . . . . 45 M 5 ,» 

 Metabisulphite of Potash . 120 „ 14 „ 

 Bromide of Potassium . 20 ,, 2 „ 

 Water, boiled or distilled, to 20 oz., 1000 c.c. 



No. 2 



Soda Carbonate (Washing Soda) 4 oz., 200 grms. 

 Water, distilled or boiled, to 20 oz., 1000 c.c. 



