Why did classical physics need EM fields but not electron fields?

[deadringer]

I'm studying a QFT course, and we've been asked to consider why classical physicists found it useful to introduce electric and magnetic fields, but not fields for electrons or other particles. I'm completely stumped, and would appreciate any hints. thanks

 

[pam]

The wave length of visible light is thousands of Angstroms so the wave propagation of photons was easily seen. Wave lengths of massive particles is much shorter, so their wave propagation was not noticed for a long time. Also, photons are bosons so macroscopic fields due to ~10^20 photons existed. Fermions cannot produce macroscopic field strengths.