On Thu, Dec 10, 2009 at 3:56 PM, Miserere wrote:
>
> In related matters: How do you find this lens wide open? My 24mm is
> not great at f/1.8, improves noticeably by f/2, and is pretty good at
> f/2.2. Oh, and have you noticed that wide open the camera body reads
> f/1.7, not f/1.8?
My 28/1.8 is
If it's like the Sigma 30/1.4 there's no clutch on the lens. When the
camera is in auto-focus mode the motor stays engaged. Switching the
camera to manual focus retracts the motor drive pin on the camera.
The manual focus ring follows auto-focus like the manual focus ring on
the Pentax FA-J 18
Larry,
I have the 24mm f/1.8 (the 20mm, 24mm and 28mm all share the same
body) and your description is correct for a non-faulty lens. It would
be nice if setting the lens to manual focus disengaged the drive gear,
but Sigma didn't think that was a good idea...probably just to annoy
you and me :-)
You need to set both the camera and the lens to MF, as if you don't you
will end damaging the in-camera AF motor. If you only use the lens
clutch, it isn't like on Pentax FA* lenses, on which you only need to
push backwards the focusing ring to disengage AF.
Carlos
Larry Colen escribió:
Does
Larry, the behavior you listed is OK, as any lens without QuickShit
(all third party lenses).
My 28/1.8 focusses without problem in MF however although the weight
of the glass means you really have to turn it, not push it gently.
That being said it does turn without problem, rattling or whatever.
Larry Colen wrote:
On Dec 10, 2009, at 12:38 AM, Boris Liberman wrote:
Larry, isn't there a some kind of clutch that you have to engage or
disengage prior to going manual focus?
If the lens is in autofocus and the body is in autofocus, then it
will autofocus without the focusing ring turni
On Dec 10, 2009, at 12:38 AM, Boris Liberman wrote:
Larry, isn't there a some kind of clutch that you have to engage or
disengage prior to going manual focus?
If the lens is in autofocus and the body is in autofocus, then it
will autofocus without the focusing ring turning.
If the lens is
Larry Colen wrote:
Does anyone else have the 20/1.8?
Optically it seems like a sweet piece of glass. Unfortunately while I
needed it last weekend, it didn't show up until Monday and I haven't had
a lot of time to play with it.
The first thing that I noticed was that in manual focus, focusi
Larry, isn't there a some kind of clutch that you have to engage or
disengage prior to going manual focus?
On Thu, Dec 10, 2009 at 10:26 AM, Larry Colen wrote:
> Does anyone else have the 20/1.8?
>
> Optically it seems like a sweet piece of glass. Unfortunately while I needed
> it last weekend, i
Does anyone else have the 20/1.8?
Optically it seems like a sweet piece of glass. Unfortunately while I
needed it last weekend, it didn't show up until Monday and I haven't
had a lot of time to play with it.
The first thing that I noticed was that in manual focus, focusing it
felt like i
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