Ellis Vener , Jan 22, 2003; 11:48 a.m.
The very dark skies in the Ansel Adams prints made late in his life, even from negatives made earlier in his life, are a result of darkroom manipulations; the sparkling whites certqainly are. Earlier versions of the same prints show much more detail in the skies. It is probably best to start with a medium to dark yellow filter, and a #25 (red) filterand use the latter sparingly. At some point downthe road you may wish that your negatives were not so contrasty as regular use withthe thred filter will make them.