Automatic Aperture Variation in relation to flash distance with EF lenses
·In the aperture priority AE/manual operation modes
(At ASA 100, with 50mm f/1.4 EF lens and Mamiyalite MZ 36R):
(A) For auto flash photography up to 9m, f/4 is the ideal
aperture since the intencity of the flash is controlled according
to the focused distance and surplus energy is saved for the next
shot.
(B) Beyond 9m at f/4, the Crossover System automatically
opens the aperture to obtain the required additional exposure.
(C) At small apertures. recharging takes longer because greater
flash intencity is required when the lens is stopped down.
(1)
Normal Flash Exposure:
When you press the shutter button partway after the flash unit has recharged, the
EF mark and the aperture value you have chosen will be indicated in the viewfinder.
(2)
Crossover Flash Exposure:
When your subject is too far away for a proper exposure at the aperture setting
you have chosen, the Crossover System will automatically correct the aperture for you. The " o " crossover
symbol appears at the right of the aperture value indicated in the viewfinder to inform you that a cross over
flash exposure is being made.
(3)
Underexposure:
If your subject is too far away for a proper exposure even at the maximum aperture of the
lens in use, the maximum aperture indication will flash in the viewfinder to inform you that your subject is out
of flash exposure range.
·When you set the crossover switch to FIX by sliding it forward, the Crossover System is disengaged and flash
exposures will always be made at the aperture you have chosen.
·When the subject is too far away for a proper exposure, however, the aperture setting will flash in the
viewfinder as a warning. To obtain a proper exposure, open the aperture ring manually until the flashing ceases.
·In the programmed AE/shutter speed priority AE modes
(at ASA 100, with 50mm F/1.4 EF lens and Mamiyaite MZ 36R)
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