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Technical Notes
Optional Accessories
Shoe-mounted
flash units
EF-20 This hot-shoe clip-on flash unit has a guide number of
20 (ISO 100), supports i-TTL, can be angled up to 90°
for bounce-flash photography, and takes two AA 1.5 V
batteries.
EF-42 This hot-shoe clip-on flash unit has a guide number of
42 (ISO 100), features 24–105 mm auto zoom, supports
i-TTL, can be angled up to 90° for bounce-flash pho-
tography, and takes four AA 1.5 V batteries.
EF-X20 This clip-on flash unit has a guide number of 20 (ISO
100, m/ft.), supports i-TTL, manual exposure and slave
flash, and takes two AA 1.5 V batteries.
Adapter ring AR-S1 An aluminum adapter ring exclusively for use with the S1. It is used when
attaching the PRF-72 protector filter or φ72 mm filters available from third-
party suppliers.
Protector Filter PRF-72 Protect the lens from scratches caused by sand, dust, and other foreign ob-
jects when shooting outdoors. The AR-S1 adapter ring is required when
attaching the filter.