P. J. Alling wrote this about the different angle of view between the 15mm and 20mm pentax lenses:
> The actual 5° would make an enormous difference, 15° would make a > stupendous difference Hmmm. I used the Field Of View Calculator on Boz's website: http://www.bdimitrov.de/kmp/technology/fov.html 15mm = 110 degrees 20mm = 95 degrees Those are diagonal measurements. Tom Reese
