This is something 'new' for me and it may be "old" news to you folks, but I had "MF
" set on the 'focus mode lever
' of the camera ... then reached up and threw the 'MODE dial
' to AUTO
... and suddenly the lens started focusing in AutoFocus
(despite the 'focus mode lever'
setting!). Talk about an unexpected "mode reset." Geez!
That's a bit unnerving and a bit dangerous to the equipment, when you are setting up a MACRO shot with your TAMRON SP AF 180mm f/3.5 Di LD
and it starts crawling around in your supporting hand. Thank goodness it's not a fast focus, or the entire rig would have wound up on the floor ... as the 2/3rds of the lens barrel is turning during focus, when the lens' "One-touch" M/AF Slide is in the M-position
Apparently there is no "manual focus" in the AUTO mode, unless you press the "AF/MF" button on the upper right hand rear of the camera and HOLD it with your thumb. Admittedly, I found that just a little strange, to be honest, and hard to maintain a positive grip
on the camera body while focusing with the left hand.
Anyone else gotten this kind of surprise out of their lenses, when suddenly, you are no longer "manually" focusing?
Also ... the α700
will only "home" (take the lens back to "infinity"-focus) a lens for one-second max, when you shut it off. That may not be enough time to completely roll back the focusing elements to the "infinity" stops, which could result in lens damage, when storing ... because the elements are still out there, in the focusing gears. Turn it on and off again, just to be sure.
By the way, the α100
does not do this ... when the AF/MF slide switch on the α100
is set to "MF" ... it means it ... no matter what mode you select. And there is no "AF/MF" button on the back, just an 'AV' button for exposure adjustment.
Little weird stuff ... you should probably know about, before your non-internally focusing lens runs away with itself.