In any case, the camera refusing to seek focus is an intermittent
occurrence. It might have to do with heavy backlight, or something else.
Anthony Farr wrote:
The electrical contacts between lenses and bodies are usually kept
clean by the mounting and dismounting process. Each time you turn a
lens towards the lock position, or away from it, it wipes clean the
contacts by a very small amount. So, a seldomly mounted or changed
lens only gets cleaned seldomly and can become 'iffy' in its
connection. Sometimes I've had to hold in the lock button and work the
mount to eliminate an intermittent electrical disconnection of a lens,
which I've experienced in different mounts and their various
sub-versions: Nikon, Pentax K, FourThirds and Micro FourThirds.
They've all experienced this issue from time to time.
Some people claim you should switch off a camera whenever you change
lenses. I think that's being overly cautious, however if you're going
to 'work the mount' like I suggested it'd be a good idea. Perhaps it's
also a precaution to take with this lens in case it's getting
premature and interrupted boot-ups during mounting to a powered
camera.
regards, Anthony
On 19 December 2017 at 07:10, Larry Colen<l...@red4est.com> wrote:
Anthony Farr wrote:
First you need to isolate the fault to either the lens or the camera
body. You have other camera bodies so start by determining if the
Bigma behaves or misbehaves on those.
regards, Anthony
I've had similar problems with the lens on other bodies. I don't tend to use
other lenses for birding. Cleaning contacts seems to be a good suggestion.
This was just the time it happened and I actually thought to mention it.
Since it's sporadic, that makes diagnosis a bit more challenging.
On 18 December 2017 at 17:49, Larry Colen<l...@red4est.com> wrote:
This afternoon I was photographing a heron at the Waldport seawall with
my
K-1 and sigma 50-500 during low tide. It had flown from one spot to
another, I was walking back to the new spot, photographing as I went, and
at
one point the camera went completely out of focus, then wouldn't even
attempt to focus. I eventually got it back on track, got some more shots,
then the bird spooked, flew off (past me) I tried for some flight photos
but
the lens again went completely out of focus, then refused to do anything
to
get back into focus. With the bigma I couldn't (easily) manually focus
and I
completely lost my opportunity for those BiF photos.
Does anyone know what causes the focus mechanism to freeze up like that,
or
any way to convince it to try to refocus?
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