Glass selection tends to be both a science and an art.  It is the intent of this paper to remove the  b()8l'x_|K  
"mystique" surrounding glass selection, primarily based on the chromatic properties of the glass,  gV]4R"/  
and to show via careful parametric analyses how we can optimally select glasses for lenses of  EP38Ho=[  
different f/numbers, spectral bands, and performance requirements.  The important roles of  KF7w{A){  
refractive index and Abbe number as well as partial dispersion will be considered. Using the  XGZZKvp  
SCHOTT glass map, six separate and identifiable regions along with glasses within each region  s4Ja y!A  
will be discussed.  The goal for this paper is to make glass selection easier to understand.