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I can see it now: someone shooting with the 20d at the Photokina Canon
booth...., suddely they say "wait a minute", pop the battery out and
back in............then they say "allright" and keep shooting. There's
gonna be a lot of "What the hell was that" going around the floor.

In order for Canon to avoid such a major embarassment, they must
already know what the exact problem is and have a fixed or newer
model, or they're playing the odds that there's a low probability for
that to happen.

I'd go out and buy this camera today...........based on reports it's a
great camera barring lockup.......but nobody seems to know yet
whethere it might be a batch of bad circuitry, a firmware fix, or
what. Furthermore, what happens to returns? Are they repackaged as
"open box" or whatever, or do they get "fixed", repackaged and sold as
new?

GS

greensteak wrote:

> I can see it now: someone shooting with the 20d at the Photokina Canon
> booth...., suddely they say "wait a minute", pop the battery out and
> back in............then they say "allright" and keep shooting. There's
> gonna be a lot of "What the hell was that" going around the floor.
>
> In order for Canon to avoid such a major embarassment, they must
> already know what the exact problem is and have a fixed or newer
> model, or they're playing the odds that there's a low probability for
> that to happen.
>
> I'd go out and buy this camera today...........based on reports it's a
> great camera barring lockup.......but nobody seems to know yet
> whethere it might be a batch of bad circuitry, a firmware fix, or
> what. Furthermore, what happens to returns? Are they repackaged as
> "open box" or whatever, or do they get "fixed", repackaged and sold as
> new?
>
> GS

The problem is not as widespread as at first thought and it may be an
'old' problem re-surfacing. If you have stored your lens for any length
of time and not cleaned the electro contacts, you could get this problem.

On the subject of returns...
14 day, no questions asked replacements at the dealers. This sounds like
Canon are sending all the 'faulty' cameras back to Japan for analysis,
not rotating them into new stock which incidently is illegal anyway.

Often when the humidity goes from 90% to 30% or visa versa, electrical
contacts which don't pass much current will develop a tarnish or film on
them. It has been known in many circles for some time that the fix is to
use an eraser and clean the contacts on both the camera and the lens.
Problem gone!

Ryadia

Ryadia wrote:

>
> On the subject of returns...
> 14 day, no questions asked replacements at the dealers.

From what source?

Phil

Does anybody know how widespread this problem is and if it is indeed caused
by changing lenses with the camera on?

I posted the following in an earlier thread:

One possibility is that the lens generates an interrupt to the processor
when mounted or dismounted. If a non-maskable interrupt is employed, then
stack overflow could result. If you are really interested you can research
terms like switch bounce, stack overflow, and non-maskable interrupt service
routines.

Charles Schuler wrote:
> Does anybody know how widespread this problem is and if it is indeed caused
> by changing lenses with the camera on?
>
> I posted the following in an earlier thread:
>
> One possibility is that the lens generates an interrupt to the processor
> when mounted or dismounted. If a non-maskable interrupt is employed, then
> stack overflow could result. If you are really interested you can research
> terms like switch bounce, stack overflow, and non-maskable interrupt service
> routines.
>

There is no particular pattern. My 20D has not done it yet. Others
report having it happen once and never again. Some say they have a way
to make it lock up consistently -- but it does not work that way with
ohter cameras.

Many theories from many folks -- but only Canon's will matter in the end.

Here is the place to look:

http://forums.dpreview.com/forums/fo...um=1019&page=1

Look under all bridges for trolls

Phil

In article <ptudnZr-Euzkf8TcRVn->, Charles Schuler
<> wrote:

> Does anybody know how widespread this problem is and if it is indeed caused
> by changing lenses with the camera on?
>
> I posted the following in an earlier thread:
>
> One possibility is that the lens generates an interrupt to the processor
> when mounted or dismounted. If a non-maskable interrupt is employed, then
> stack overflow could result. If you are really interested you can research
> terms like switch bounce, stack overflow, and non-maskable interrupt service
> routines.

What is with you people on this subject? What kind of imbecile would
design a piece of equipment like that? And what thought process would
make one even suspect such a thing?

"Charles Schuler" <> wrote in message
newstudnZr-Euzkf8TcRVn-...
> Does anybody know how widespread this problem is and if it is indeed
caused
> by changing lenses with the camera on?
>
> I posted the following in an earlier thread:
>
> One possibility is that the lens generates an interrupt to the processor
> when mounted or dismounted. If a non-maskable interrupt is employed, then
> stack overflow could result. If you are really interested you can
research
> terms like switch bounce, stack overflow, and non-maskable interrupt
service
> routines.
>
>
I've had it happen twice, without changing lenses, CF cards, flashes, or any
of the other alleged culprits. One guy noticed that, after 2 lockups and a
third complete stoppage (removing the battery didn't even help, he replaced
the 3v backup battery to get restarted) he turned off the "Auto Off" feature
and has shot over 1200 images without a lockup. I turned mine off, and shot
about 100 this evening without a lockup. Could this be the problem?

--
Skip Middleton
http://www.shadowcatcherimagery.com

"Charles Schuler" <> writes:

> Does anybody know how widespread this problem is and if it is indeed caused
> by changing lenses with the camera on?
>
> I posted the following in an earlier thread:
>
> One possibility is that the lens generates an interrupt to the processor
> when mounted or dismounted. If a non-maskable interrupt is employed, then
> stack overflow could result. If you are really interested you can research
> terms like switch bounce, stack overflow, and non-maskable interrupt service
> routines.

What, they forgot to tell the developers that lenses were supposed to
be hot-swappable? If so...idiots!
--
David Dyer-Bennet, <mailto:dd->, <http://www.dd-b.net/dd-b/>
RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/>

"David Dyer-Bennet" <dd-> wrote in message
news:...
> "Charles Schuler" <> writes:
>
> > Does anybody know how widespread this problem is and if it is indeed
caused
> > by changing lenses with the camera on?
> >
> > I posted the following in an earlier thread:
> >
> > One possibility is that the lens generates an interrupt to the processor
> > when mounted or dismounted. If a non-maskable interrupt is employed,
then
> > stack overflow could result. If you are really interested you can
research
> > terms like switch bounce, stack overflow, and non-maskable interrupt
service
> > routines.
>
> What, they forgot to tell the developers that lenses were supposed to
> be hot-swappable? If so...idiots!
> --
> David Dyer-Bennet, <mailto:dd->, <http://www.dd-b.net/dd-b/>
> RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/>
> Pics: <http://dd-b.lighthunters.net/>
<http://www.dd-b.net/dd-b/SnapshotAlbum/>
> Dragaera/Steven Brust: <http://dragaera.info/>

See my post above. I don't think that changing lenses has anything to do
with the lockup. I've changed lenses to a far-thee-well on my 20D without a
problem, had it lock up twice without changing a thing...

--
Skip Middleton
http://www.shadowcatcherimagery.com

In article <shy6d.36812$aW5.32441@fed1read07>,
says...
> See my post above. I don't think that changing lenses has anything to do
> with the lockup. I've changed lenses to a far-thee-well on my 20D without a
> problem, had it lock up twice without changing a thing...

Goblins. There are goblins in your camera. I suggest you give some
anti-jive help immediately.
--
http://www.pbase.com/bcbaird/