Film Exposure Calculation
in Photomicrography
New Time
Standard Time
=
(
Standard N.A.
New N.A.
)
2
x
(
New Mag.
Standard Mag.
)
2
Standard
Time
Standard
Numerical Aperture
Standard
Magnification
?
Calculated
Exposure Time
New
N.A.
New
Magnification
=
x
(
)
2
x
(
)
2