SELECT PHOTO METHOD--
  (A) PRIME FOCUS
  (B) BARLOW PROJ.
  (C) EYEPIECE PROJ.
  (D) AFOCAL METHOD
  (E) QUIT
? A

OBJECTIVE F.L.? 7.89
APERTURE? 1.23

EXAMPLE F/NUMBER? 2.5
EXAMPLE FILM INDEX? 600
EXAMPLE TIME? 360

YOUR FILM INDEX? 1200
 1185.05  IS YOUR TIME

NEXT? 
SELECT PHOTO METHOD--
  (A) PRIME FOCUS
  (B) BARLOW PROJ.
  (C) EYEPIECE PROJ.
  (D) AFOCAL METHOD
  (E) QUIT
? E

