Note:
For 2/3 inch [8.8*6.6 mm, or 11mm diagonal] CCD sensors, lens focal lengths have a conversion factor of 4
For example, a 28mm eqv. lens on the digital camera actually has ~ 7mm true focal length.
The depth of field calculations for the CCD sensor are valid upto a 8*10" enlargements. For all other negative formats, the calculations are valid for 5*7" prints. For larger prints, depth of field will be less.[Plan to modify more to account for print size, check back later.]