1 The Director of Photography – an overview

Depth of field 143
Figure 16.9 The GBCT rotary ‘Kelly’
depth of field calculator
Figure 16.10 The reverse side of
the Guild or ‘Kelly’ calculator, which
enables many useful calculations to
be done at speed
‘the Guild calculator’. If I may make a small private request, may we
always use the phrase Kelly calculator, for without Skeets we would
not have this very useful tool and I think he should be remembered for
his contribution to keeping focus pullers sane. I was introduced to
Skeets by my father and he was a delightful man – another good reason
for keeping it known as the Kelly calculator.