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Old Jun 1, 2011, 5:14 AM   #1
mwi
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Default Still confused about SAM lenses AF on/off

Hi !

On the A 550 house and SAM lens there a AF On/OFF switches on both.

Is it correct procedure to switch to AF On on both lens and house and AF OFF on both lens and house or is it done on house or lens only ?

excuse my poor english but which switch takes control over the setting AF or MF ?

On the house or the lens ?

I will presume the lens is logical but does the AF on the house suffer damage then so both must be turned off ??

IMG , yes I am confused

thanks
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Old Jun 1, 2011, 6:18 AM   #2
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If the lens has an AF/MF switch, use it.
(The AF/MF switch on the camera should be set to AF.)

If the lens doesn't have an AF/MF switch, use the one on the camera.

See Selecting the focus method on page 79 of the A500/A550 Instruction Manual.
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Old Jun 1, 2011, 7:13 AM   #3
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This should be correct for Sony branded lenses, but not for all 3rd party. i have the Tokina 11-16 which uses a sliding sleeve to engage MF. Switching the body to MF sure turns off AF but doesn't enable MF. The sleeve still has to be moved to the MF position. I find this sufficiently confusing that if the lens has an MF switch, I move both lens and body to MF. Others, sharper than me, may be able to just remember.
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Old Jun 1, 2011, 10:35 AM   #4
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I believe the issue is what you do if both the camera and the lens have AF motors. Tokina's One-touch Focus Clutch Mechanism, and similar features on lenses from other manufacturers, disengages the lens' AF mechanism from the camera's AF motor. It doesn't swich off the lens' own AF motor, because it doesn't have one.
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