Nikon SB-10 instruction manual Automatic Exposure Operation

AUTOMATIC EXPOSURE OPERATION

The S8-1O co ntrol s the amount of Iight o utput depending o n the flash-to-subject dist ance. The further away the subj ect is, the more li ght it em its; the closer the subject, the less it emits. In ad dition, the recycling time changes with the di stance. The closer th e subject, the sh o rter t he rec yc ling ti me .

Exposure Calculator

The ex posure calculator helps you to select the u sab le range of f/ numbers for t he speed of th e film you are using and t he effect ive dis- tance range. For any film speed, you have two f/ numbers to choose from. Each of the f/ numbers determines the max imum di stance range the auto ex posure can co ntrol. The mini- mum dist ance rem a in s O.6m (2 ft) rega rdl ess of the f/ number. With the distan ce unch anged, the smal ler t he f/ number (the larger the a perture), t he shor ter the flash duration. Of course, the range of u sab le f/numbers changes with the film speed while the distance range rema in s t he same for all speeds .

First, position the speed of the film (ASA number) opposite the white delta by t urning t he knurled rim of t he calculator . Lines be- twee n the numbers on the fi lm-speed scale represent in ter med iate sett ings such as 32, 64, etc., as illu strate d . Note the f/ numbe rs oppos ite the orange and blue indi cator blocks respective- ly as the max imum distance range is ind icated in both meters and feet opposite each co lo r- ed block. Then read off the most suitab le f/ number whi ch gives yo u the distance range, depth of field and fl a sh duration you want. On m anual contro l, read off t he f/nu mber which appears opposite t he distance you want.

12