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It had been known to widely among photographers and the researchers in the field since the Silver-Salt film period that an adequate exposure value could be calculated by applying "APEX relation expression".

Even after the biggest revolution, exchanging the chemical imaging sensor method into Physical electronic one, exactly the same idea and the way of thinking are invited unreasonably. This matter will be described later.


AV=2log2A
TV=-log2T
BV=log2xB/4
SV=log2(0.32Sx)

EV=AV+TV
EV=BV+SV

AV:Aperture Value
TV:Time Value
BV:Brightness Value
SV:Sensitivity Value
EV:Exposure Value

We should pay attention to that the Exposure Value is absolute value on the other hand AV, TV BV and SV are all relative values promptly. It is relatively difficult to explain about Brightness Value to laymen and beginners.

Professionals often invite 18 % standard reflective gray plate, the average reflective value of all the existing materials is the reason to be show to audience. Then how do they connect to the logic with the technology of electric developing engines?

It is a hard task to connect things with no relations while deceiving people. Also, this kind of old theory should be listed in the explanations, the necessity to be explained about why the law of inconsistency was lost on the Digital Image especially in a close-up shooting situation.

This is probably because engineers who were obsessed with the chemical reaction of Silver-Salt and the concept of old lens designing took over the Digital Camera designing. The primary manufacturer SONY runs first who has been nourished excellent electronic engineers, as a proof.

The engineers in various divisions should be required to participate in the Digital Camera production, of course the conventional engineers in Film Camera manufacturing are not enough. To the extreme, conventional engineers in the mechanical field are not required at all except the Engineering Plastic Injection molding division. Rumors are flowing recently, disappearance of camera makers.

As a proof a home appliance maker SONY with no experience in camera manufacturing has succeeded in achieving the best in the industry. Of course there are several secret stories, inviting optical engineers from Minolta and an alliance with Carl Zeiss.