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zDA 12-24mm f/4ED AL [IF]
PENTAX external flash units which cover a 24mm lens on a 35mm SLR, or 16mm lens on a digital SLR, can be used when the lens is set from 16mm to 24mm.
AF540FGZ and AF360FGZ can be used from 13mm to 24mm with the wide angle panel (In both cases, it is possible to use the lens hood). Please note that at focal lengths less than 13mm the corners of the picture will not be fully illuminated.
Other external flash units are not recommended, because their coverage angle is not wide enough to cover the angle of view of the lens.
zDA 16-50mm f/2.8ED AL [IF] SDM zDA 16-45mm f/4ED AL
PENTAX external flash units which cover a 24mm lens on a 35mm SLR, or 16mm lens on a digital SLR, can be used with the lens hood without problems.
* For more information, refer to the manual for the external flash unit.
