> Bill - can you please explain what you mean by a "linear motor", and
> why they are difficult to shield?
>
> I'm not sure how to tell if the field is parallel to the back of the
> camera. It's kind of all around it, but seems more so to near where
> the batteries are...
>
>
> R.
>
> --- In [hidden email] <eSens%40yahoogroups.com>, "Bill Bruno"
> <wbruno@...> wrote:
> >
> > Ah- I just realized it probably has some kind of linear motor
> > to move the mirror and shutter. These can be awful, and
> > unfortunately not too easy to shield. If the field is parallel
> > to the back face of the camera, try a piece of mu metal
> > on the back, and wrap it around an inch or so on the edges.
> > Cut out holes where needed. I have not tried holding mu-metal
> > for long periods so you might need to put something else over it,
> > or not keep your hand on it. But, I'm guessing you'll be lucky
> > to get a factor of 2 or 3 improvement, which is worthwhile if
> > you're set on this camera, but may not be enough to really
> > make it safe.
> >
> > Bill
> >
> > On Sun, Mar 9, 2008 at 4:37 PM, rticleone <rticleone@...> wrote:
> >
> > > Hi Bill, it does indeed have manual focus, and I've been using it,
> > > besides, I think it's good to be able to do that - auto this, and auto
> > > that these days... - but it would be nice to be able to use autofocus
> > > for low light or fast moving objects. Thing is, every time the
> > > shutter gets opened to take a picture, there's the same magnetic
> > > discharge, I guess because the shutter's electronically controlled.
> > >
> > > Still working on finding someone who can help. I can't imagine it'd
> > > be too difficult to do with the knowledge of how to open one of these
> > > up, I just need a willing person. I've sent out a lot of emails, but
> > > the weekend's just ending here, so I've got to wait a bit.
> > >
> > >
> > > Best,
> > >
> > > R.
> > >
> > > --- In [hidden email] <eSens%40yahoogroups.com><eSens%40yahoogroups.com>, "Bill Bruno"
> > > <wbruno@> wrote:
> > > >
> > > > Maybe it has a manual focus mode?
> > > > Bill
> > > >
> > > > On Sat, Mar 8, 2008 at 4:13 PM, rticleone <rticleone@> wrote:
> > > >
> > > > > Hey Bill,
> > > > >
> > > > > There is a 2.5" screen on the back, but because this is an SLR
> style
> > > > > camera, it has to be held up to the head to "shoot", because
> you look
> > > > > directly through the optical viewfinder. The screen is always off
> > > > > when taking the picture.
> > > > >
> > > > > I hear you - I don't feel anything from using the camera, and most
> > > > > people here so far have said they probably wouldn't worry
> about it.
> > > > > It may not even go as high as it shows, because it's an outdated
> > > > > meter. But - like I said in my last reply to someone else, I'd
> still
> > > > > rather shield it.
> > > > >
> > > > > Best,
> > > > >
> > > > > R.
> > > > >
> > > > >
> > > > > --- In [hidden email] <eSens%40yahoogroups.com>
> <eSens%40yahoogroups.com><eSens%40yahoogroups.com>, "Bill Bruno"
>
> > >
> > > > > <wbruno@> wrote:
> > > > > >
> > > > > > I have heard of people reacting to cameras.
> > > > > >
> > > > > > What's probably important is the field inside your skull,
> > > > > > i.e. try to put the meter where you brain is, not right up
> > > > > > to the camera. But I would not want 3 milligauss even.
> > > > > > Short exposure is better than long, but pulses can be bad.
> > > > > >
> > > > > > Having a screen on the back may be better, although a smaller
> > > > > > screen could be safer compared to the new big ones.
> > > > > > Bill
> > > > > >
> > > > > > On Thu, Mar 6, 2008 at 6:19 PM, rticleone <rticleone@> wrote:
> > > > > >
> > > > > > > I have really gotten into photography in the last couple
> of years.
> > > > > > > With the advent of digital cameras, I am able to take pictures
> > > without
> > > > > > > dealing with developing chemicals, or the cost of many takes
> > > in film
> > > > > > > to keep one shot.
> > > > > > >
> > > > > > > I was recently gifted (birthday gifted) a Digital SLR
> Camera. It
> > > > > > > works very well and takes great pictures.
> > > > > > >
> > > > > > > First thing I did was check it's EMF output. Very low
> electrical
> > > > > > > fields. That can be dealt with simply. Great!, I thought.
> > > > > > >
> > > > > > > Then I check it's magnetic fields. And I thought, "sh*t!".
> Because
> > > > > > > naturally whenever the lens focuses automatically, or the
> shutter
> > > > > > > opens to take a picture, there is a burst of a magnetic field
> > > from the
> > > > > > > motor. I can't BELIEVE I didn't think of this before. Gah...
> > > > > > >
> > > > > > > It jumps to about 35 milligauss on average (meter up
> against the
> > > > > > > camera, just like the face of whoever's using it - this is the
> > > kind
> > > > > > > where you look through the viewfinder, it's not a point
> and shoot
> > > > > > > where you use the screen).
> > > > > > >
> > > > > > > Do I have reason to be concerned about these bursts of
> magnetic
> > > > > > > fields? I mean, it's not constantly against my head, and they
> > > last for
> > > > > > > perhaps a second or less at a time, only when the shutter
> fires. I
> > > > > > > can even get away from the motor focusing the lens most of the
> > > time by
> > > > > > > using manual focus and adjusting it by hand.
> > > > > > >
> > > > > > > Unfortunately, I can't just take this thing apart and try and
> > > shield
> > > > > > > the motor from the inside, myself. There is a very thin and
> > > flexible
> > > > > > > foil called Met Glas that sounds like it could be used for
> such a
> > > > > > > purpose, but it's the matter of getting it inside that's the
> > > issue.
> > > > > > >
> > > > > > > Maybe I can find a technician who's willing to do it?...Hmm...
> > > > > > >
> > > > > > > I can theoretically shield some parts of the camera from the
> > > outside
> > > > > > > with this material.
> > > > > > >
> > > > > > > But - what are your thoughts on these brief magnetic fields?
> > > > > > >
> > > > > > > Best,
> > > > > > >
> > > > > > > R.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > > [Non-text portions of this message have been removed]
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>