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 Post subject: Full time manual focus
PostPosted: Tue Dec 04, 2007 4:55 pm 
Hi.
I finally bought the 17-40L and have a question about the full time manual focus.

This is the description from Canon site (and the lens manual):
"Many EF lenses are equipped with a ring-type USM which allows full-time manual focus in AF mode. This means you can manually fine-tune focusing as soon as auto focus is complete, without having to switch to manual focusing mode"

The guy from the shop said that it is not adviced to manually focus while the lens is in AF mode.
My question is, can I manual focus without even pressing the shutter release? Or this is only after the camera focused?
Thanks.
Liron.


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PostPosted: Tue Dec 04, 2007 5:53 pm 
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Liron wrote:
...My question is, can I manual focus without even pressing the shutter release? Or this is only after the camera focused?...

Yes, but the trouble with manually focussing before you take first pressure on the shutter release is that, with the lens set to AF, as soon as you do start to press the shutter release the camera will auto-focus and you lose your setting. :(

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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 Post subject:
PostPosted: Tue Dec 04, 2007 6:43 pm 
Hi Bob.
Of course it will focus, that's why there is the AF-MF switch :wink:
I was afraid it will damage the lens somehow. I know that in other lenses, that don't have the full time manual focus, it can damage the focus motor.
Thanks for you answer.
Liron


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 Post subject:
PostPosted: Tue Dec 04, 2007 6:48 pm 
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Hi Liron,

That said, if I have the lens in AF mode I don't pre-focus manually. Rather, if the scene is out of focus and I want to compose but I'm not ready to take a picture, I just take up first pressure on the shutter and once the camera has autofocussed I then release the shutter again.

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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